MetOp-SG MWI
Tipo Doc.:
Doc.Type:
REQUIREMENT SPECIFICATION
N° Doc.:
Doc. N°:
MOS-RS-CGS-MWI-0003
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Title :
INSTRUMENT DESIGN CONSIDERATIONS AND REQUIREMENTS FOR LONG TERM STORAGE
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LISTA DI DISTRIBUZIONE
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MWI Team
Di
Of
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N
A
1
X
I
2014.09.05
11:08:18 +02'00'
L. Cremonesi (CGS-PA)
05/09/2014
X C. Cinquepalmi (CGS-
05/09/2014
CC)
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authorized by:
1
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T. Lupi (CGS-SE)
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MWI Team
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Consider and Req for Long Term St)
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
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MOS-RS-CGS-MWI-0003
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REGISTRAZIONE DELLE MODIFICHE / CHANGE RECORD
EDIZIONE
ISSUE
DATA
DATE
AUTORIZZAZIONE
CHANGE AUTHORITY
OGGETTO DELLA MODIFICA E SEZIONI AFFETTE
REASON FOR CHANGE AND AFFECTED SECTIONS
01
16/10/2012
First Issue
02
05/09/2014
Second Issue:
Updated document logo and intellectual rights note
Updated Applicable document list
General updating to Chapter 4 – 5
Added Chapter 7
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
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MOS-RS-CGS-MWI-0003
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
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MOS-RS-CGS-MWI-0003
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TABLE OF CONTENTS
1.
INTRODUCTION AND SCOPE ................................................................................................................. 5
1.1
MWI PROGRAMME PLANNING ........................................................................................................ 5
2.
APPLICABILITY ........................................................................................................................................ 6
3.
DOCUMENT ORGANISATION.................................................................................................................. 6
3.1
RELEVANT DOCUMENTS ................................................................................................................. 7
3.1.1
APPLICABLE DOCUMENTS ............................................................................................................... 7
3.2
REFERENCE DOCUMENTS .............................................................................................................. 8
3.3
ACRONYMS........................................................................................................................................ 8
4.
GENERAL PRINCIPLES ........................................................................................................................... 9
4.1
5.
SPECIFIC LIFETIME REQUIREMENTS APPLICABLE TO FLIGHT INSTRUMENT/EQUIPMENTS ... 13
5.1
5.2
5.3
5.4
6.
DESIGN REQUIREMENTS DERIVED FROM THE MWI TRS [AD09] ............................................. 13
DESIGN REQUIREMENTS DERIVED FROM INSTRUMENT GDIR [AD13A] ................................ 13
REQUIREMENTS DERIVED FROM PA REQUIREMENT FOR SUPPLIER [AD14B] ..................... 17
REQUIREMENTS COMING FROM ECSS-E-ST-33-01C ................................................................ 17
GSE SPECIFIC DESIGN REQUIREMENTS ........................................................................................... 18
6.1
7.
CONSIDERATIONS ON INSTRUMENT STORAGE ........................................................................ 10
MWI STORAGE CONTAINER SPECIFIC DESIGN REQUIREMENTS ........................................... 18
INSTRUMENT LONG STORAGE CONSTRAINTS ................................................................................ 19
LIST OF TABLES
Table 3-1: Applicable Documents ...................................................................................................................... 7
Table 3-2: Reference Documents...................................................................................................................... 8
Table 4-1 – General Guidelines for long term storage .................................................................................... 10
Table 4-1 – Instrument storage consideration ................................................................................................. 12
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
N° Doc:
Doc N°:
MOS-RS-CGS-MWI-0003
Ediz.:
Issue:
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Pagina
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Data:
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1. INTRODUCTION AND SCOPE
This document presents the design requirements and constraints that shall be applied from the very
beginning of the instrument design at all levels of the instrument development to ensure compatibility with the
long term storage requirements applicable to the MetOp-SG MWI Instrument.
The purpose of this document is to provide requirements in order to minimize the need for satellite and/or
instrument intervention and revalidation during and after the storage period by design and ensure all features
necessary to support the storage/destorage activities are designed in from the start of the programme.
The Storage Plan document, addressing the necessary actions to be undertaken in preparation of storage,
during the storage period and the frequency of the operations will be provided in the Instrument Long Term
Storage Plan in accordance to DRD MWI-SS-32.
The present document as well as the Storage Plan will be provided at the MWI instrument reviews as well as
at the satellite CDR in order to confirm the feasibility of the satellite storage plan and associated design
requirements, constraints and provisions necessary to support long term storage and destorage activities.
This document also address the specific requirements to be applied to the MWI Instruments should the
Agency /Prime opts for a stand alone storage.
1.1
MWI PROGRAMME PLANNING
ESA and EUMETSAT are currently working on securing the development of the MetOp Second Generation
system.
Such MetOp-SG system will provide continuity and enhancement of meteorological observation from polar
orbit in the time frame 2020 to 2040.
The Metop-SG consists of two series of satellites, designated as “Satellite A” and “Satellite B”.
The Microwave Imager (MWI) will be part of the complement for “Satellite B” as shown in the next table:
Payload name
SCAtterometer
MicroWave Instrument
Radio Occultation sounder
Ice Cloud Imager
Argos-4 data collection system
Satellite B
SCA
MWI
RO
ICI
Argos-4
The target operational system foresees 21 years of operations for both series of satellites. The nominal
planning foresees the recurrent satellites being launched at interval of 7 years for each Satellite A and B,
which implies three units in each series (so-called “3+3” configuration). However, the final configuration in
terms of number of recurrent satellites will be decided by EUMETSAT during the approval of its EPS-SG
Programme. Therefore, the baseline until the end of Phase B2 will consist of two flight models of each
satellite (including associated instruments), with an option for a third recurrent unit. These options will be
exercised (or not) prior to starting Phase C/D.
At the date of this issue three solutions are envisaged for the storage of the MWI instrument:
 Instrument integrated on the satellite (baseline)
 Instrument stored at CGS premises before integration onto satellite (SOW option 3)
 Instrument stored in its own container and associated GSE at the Instrument Supplier premises and
requiring a recalibration process before integration on the satellite (SOW option 4)
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
N° Doc:
Doc N°:
MOS-RS-CGS-MWI-0003
Ediz.:
Issue:
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Pagina
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Data:
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2. APPLICABILITY
This specification is intended to provide the requirements to be applied at:




MWI Instrument, subsystems, equipments, spares level
the relevant deliverable GSE
the SDVE (SW Development and Validation Environment ) and SVF (SW Validation Facility)
the non deliverable GSE, if they are necessary in case of MWI Instrument unit maintenance. In such
case the maintenance in operational conditions shall be kept up to the SIOVR (Satellite In Orbit
Validation Review) of the last MetOp-SG Satellite B on which the unit is embarked.
In case the instrument is stored in its own container at the Instrument Supplier (option 3 and 4), dedicated
requirements are applicable to the container and to the storage area.
3. DOCUMENT ORGANISATION
This document is structured in the following way:





Chapter 3 gives the list of applicable and reference documents as well as the acronyms;
Chapter 4 identifies the high level long term storage principles;
Chapter 5 consolidates the specific requirements imposed by the MWI Instrument to the S/C;
Chapter 6 lists the long term storage requirements applicable to the MWI Instruments. In particular
consolidates the requirements coming from the MWI IRS, GDIR and ECSS Standards;
Chapter 7 provides the specific requirements applicable to the MWI GSE, including the requirements
for the storage/transportation containers.
This document is derived from GDIR R-ENV-1010.
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
3.1
RELEVANT DOCUMENTS
3.1.1
APPLICABLE DOCUMENTS
AD
Issue/
Rev.
Doc. No.
Reserved
AD02
Reserved
AD03
Reserved
MOS-SOW-ADS-SATB-0579
1.1
Reserved
AD06
Reserved
AD07
Reserved
AD08
Reserved
MOS-SP-ADS-SATB-0580
1.4
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Issue:
02
Pagina
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Statement Of Work for the MicroWave Imager [SOW-MWI]
AD05
AD09
MOS-RS-CGS-MWI-0003
Title
AD01
AD04
N° Doc:
Doc N°:
Technical Requirements Specification for the MicroWave
Imager Instrument [TRS-MWI]
AD10
Reserved
AD11
Reserved
AD12
Reserved
AD13a
MOS-SP-ASF-SYS-00816
1.1
MetOp-SG Instrument General Design and Interface
Requirements [INS-GDIR]
AD13b
MOS-SP-ASF-SYS-00349
2.2
MetOp-SG Units General Design and Interface
Requirements [Units GDIR]
AD13c
ENS-06-00123-ASTR
8.0
General Design and Interfaces Requirements [Generic
GDIR]
AD14
MOS-RS-ESA-INS-0434
1.0
MetOp-SG Instruments Product Assurance and Safety
Requirements [PARD]
AD14b
MOS-SP-ASF-SYS-00401
1.0
MetOp-SG Product Assurance Requirements for Suppliers
AD14c
MOS-SP-ASF-SYS-00402
1.0
MetOp-SG Software Product Assurance Requirements for
Suppliers
AD15
MOS-RS-ESA-INS-0435
1.0
MetOp-SG Instruments Project Management Requirements
[MARD]
AD16
MOS-LI-ESA-SYS-0067
1.1
MetOp-SG Deliverable Items and Services List [DISL]
AD17
MOS-LI-ESA-INS-0436
1.0
MetOp-SG Instruments Document Requirements List [DRL]
AD18
MOS-LI-ESA-INS-0437
1.0
MetOp-SG Instruments Document Requirements Definition
[DRD]
AD19
MOS-RS-ESA-INS-0438
1.0
MetOp-SG Instruments Tailoring Of ECSS-E Standards
Table 3-1: Applicable Documents
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
3.2
RD
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REFERENCE DOCUMENTS
Doc. No.
Issue/
Title
Rev.
[RD01]
MOS-LI-CGS-MWI-0001
01
List of acronyms and abbreviations
[RD02]
MOS-DD-CGS-MWI-0001
02
Instrument Design and Technical Description
[RD03]
MOS-PL-CGS-MWI-0006
02
Instrument Design, Development and
Verification Plan
[RD04]
MOS-PL-CGS-MWI-0015
01
Instrument AIT plan
Table 3-2: Reference Documents
3.3
ACRONYMS
Definitions and acronyms used in the present document are compliant with the ones given in [RD01].
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
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Doc N°:
MOS-RS-CGS-MWI-0003
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4. GENERAL PRINCIPLES
Instrument, equipments and GSE designs shall be such that:


a cost effective storage can be guaranteed;
the human intervention is minimized.
Material, EEE, process and storage containers selection shall be as far as possible consistent with the long
term storage, in particular the PA shall control and assure that in the design solutions, process selection and
definition (defined in the DDVP), the storage time is considered and when a not qualified solution is the only
available, the storage time shall be evaluated in terms of risk identifying all the risk mitigation actions.
The following general guidelines are applicable for long term storage fulfilment:
ID
Guideline descrtiption
The materials shall have high properties stability vs time
1
2
3
4
5
6
7
8
9
10
11
Impact @
Equipment/Instrument/Satellit
e levels
Equipment/Instrument levels
The creep in preloaded structural parts shall be considered in the
design
The joints shall be designed to avoid preload relaxation (bolted
junction used for connecting materials not creep sensitive, low CTE
differences, the junction number shall be minimized);
The maintenance shall be minimized
The instrument shall be stored in Nitrogen to minimize aging effect
on coatings and lubricant property change, then the Nitrogen
storage shall minimize the galvanic action and the also cleanliness
shall be guaranteed
Periodic check of cleanliness witness sample shall be performed if
needed
Tests activities shall be performed during and at the end of the long
term storage to assure that no degradation occurred to process and
hardware both on instrument and on representative samples
(adhesive, creep of flexible preloaded parts, coatings, etc.)
EEE components (active or passive) aging effect shall be
considered in the procurement specification, board design,
manufacturing process (conformal coating) and in the storage
condition definition (the ageing mechanisms are ruled by
temperature, voltage and humidity .for the largest part of the
components, while other predictable aging effects are the variation
in the magnetic permittivity for ceramic capacitor and the quartz
resonance frequency variations).
EEE passive components that are affected by failure due to long
term storage shall be avoided (i.e.: tantalum capacitor). If it is not
possible to replace these tantalum capacitors, they shall be
activated each 2 years by protecting them from in-rush current
failure to avoid the internal oxide layer deterioration.
Life limited items shall be avoided as far as possible
Equipment/Instrument levels
The capability to check or refresh the EEPROM memory and to
upload software correction shall be guaranteed after de-storage
Periodic functional test on mechanism shall be performed in case of
usage of lubricated bearings
Equipment/Instrument/Satellite
levels
Equipment/Instrument/Satellite
levels
Equipment/Instrument levels
Instrument/Satellite levels
Instrument/Satellite levels
Instrument/Satellite levels
Equipment level
Equipment/Instrument/Satellite
levels
Equipment level
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
ID
12
13
14
15
16
Guideline descrtiption
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Impact @
Equipment/Instrument/Satellit
e levels
Equipment/Instrument/Satellite
levels
Electrical / functional tests and relifing activities shall be performed
during and at the end of the long term storage to assure that no
degradation occurred to process and hardware on instrument and on
representative samples
Obsolescence of parts shall be considered in the procurement in the Equipment level
spare philosophy (for the GSE as well)
GSE periodic check shall be performed during storage
Equipment/Instrument/Satellite
level
Containers shall be designed to fulfil the long term storage
Instrument level
requirements
Before launch, a de-storage procedure shall be applied to verify the Instrument/Satellite level
instrument performances and calibration and then to put the
instrument in flight configuration
Table 4-1 – General Guidelines for long term storage
4.1
CONSIDERATIONS ON INSTRUMENT STORAGE
The following table reports a critical discussion on the instrument needs during storage
ID
1
2
Title
Discussion
Remarks
At present there are no special needs for cleanliness Impacts @
identified for the MWI instrument. The same means for Instrument/Satellite levels
contamination minimization and monitoring as used for
the satellite should be applicable (GDIR_R-ENV-0045)
Points 4 – 5 of Table 4-1
Anyway particular attention shall be dedicated to avoid
lubricant degradation as well as to guarantee a
Cleanliness,
controlled environment (humidity and temperature) for
purging port,
the RF components (non-hermetically sealed Millimeter
cleanliness
wave components) during all life phases including
test samples
storage, test, launch, transportations.
This will require housing the MWI instrument in GN2
ambient, or storage of the whole satellite in inert gas
atmosphere with controlled temperature.
In addition to periodically control the contamination of the
instrument it will be required to store with the instrument
cleanliness witness samples.
Witness
Witness samples have to be stored the same
samples
environmental condition of MWI (the same container
where MWI is stored) for:
 Structural bonding
 Adhesives
 Thermo-optical and optical properties
 Lubricants
 On-board calibration target absorber
 Reflectors coating
Impacts @
Equipment/Instrument/Satellite
levels
Point 6 of Table 4-1
These witness samples shall be inspected / tested
before the MWI periodic test in order to confirm that no
degradation in the process/hardware storage sensitive
items occurred.
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
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Title
Discussion
Remarks
Specific
The instrument shall be stored with the gravity vector Instrument/Satellite levels
Orientation
aligned to the rotation axis in order to spread loads
and storage (gravity) on all rolling elements.
configuration
For what concerns the storage configuration, at this
project stage, it is foreseen to store the MWI both at
payload and at S/C levels by clamping the rotating deck
by using the locking mechanism applying a reduced
preload needed only to:


4
N° Doc:
Doc N°:
Allow the MWI to be kept in nearly any tilt angle
when clamped;
Avoid stress and possible deformation of the
Scan Mechanism (creep).
In order to keep the payload in this intermediate preload
configuration the hold device could use additional
“remove before flight” item (ground locking device),
avoiding additional complexity on the flight hardware.
Dedicated provisions shall be included in the MWI
instrument design to allow for the installation/removal of
these items. Removal/Installation of the locking device
will require the use of LLD loading/offloading device.
As minimum a rotation of the SCM is needed every year Impacts @
Periodic Test
in order to re-generate the oil film, minimizing the Equipment/Instrument/Satellite
and
possibility of false brinelling in the bearings.
levels
accessibility
to
the
During this activation a full functional test is needed to Points 8-10-11-12 of Table 4-1
instrument
check the instrument status and functionality.
This test will require physical and functional During this periodic testing
accessibilities to the instrument.
the functionality of the
Physical accessibility is need to:
Downconverter shall be
1. Install the loading/offloading device in the LLD verified (maximum interval
areas;
less than 5 years). These units
2. Install the Zero-g MGSE on top of the are not hermetically sealed
instrument;
and a GaAs diode not
3. Route and connect the test harness for the encapsulated is installed on
instrument.
them. At the present time the
Functional accessibility is needed to operate the acceptability of storage over 5
instrument without activating
the satellite and the years is not fully
following has to be considered:
demonstrated. The storage in
GN2 environment with
 Location of dedicated test ports for accessibility controlled temperature is
at satellite level;
considered a mitigation action.
 Compatibility of Platform-MWI interfaces with
this operational configuration (MWI active,
satellite inactive) shall be assessed .
In addition to the full functional test, simple health check
modes shall be identified to verify the status of the
equipment(s).
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
ID
5
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di
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Title
Discussion
Before launch a de-storage procedure shall be followed
De-storage
to prepare the instrument.
Test
and
A full functional test and a performance test shall be
accessibility
performed in ambient:
to
the
These tests will require physical and functional
instrument
accessibilities to the instrument.
Physical accessibility is need to:
1. Install the loading/offloading device in the LLD
areas;
2. Install the Zero-g MGSE on top of the
instrument;
3. Route and connect the test harness for the
instrument;
4. Position the calibration target in the instrument
field of view for performance test
Functional accessibility is needed to operate the
instrument without activating
the satellite and the
following has to be considered:


05/09/2014
19
Remarks
Impacts @
Instrument/Satellite levels
Points 8-10-11-12-16 of Table
4-1
Location of dedicated test ports for accessibility
at satellite level;
Compatibility of Platform-MWI interfaces with
this operational configuration (MWI active,
satellite inactive) shall be assessed .
Once the instrument functionalities and performances
have been verified the instrument shall be prepared for
launch. In particular the Zero-g MGSE will be removed
and final preload will be applied to the LLD. Finally all the
“remove before flight” protection will be removed.
When the launch configuration is completed only the
simple health check modes could be verified to evaluate
the status of the equipment(s).
Table 4-2 – Instrument storage consideration
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
5. SPECIFIC LIFETIME REQUIREMENTS
INSTRUMENT/EQUIPMENTS
5.1
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APPLICABLE
TO
05/09/2014
19
FLIGHT
DESIGN REQUIREMENTS DERIVED FROM THE MWI TRS [AD09]

IRS_R-MWI-1220-R
All MWI feed horns shall include a dust cap in order to protect receiver HW from dust and particles.
These dust caps shall be identified as “Remove Before Flight”.
5.2
DESIGN REQUIREMENTS DERIVED FROM INSTRUMENT GDIR [AD13a]

GDIR_R-IFM-1105
The Instruments shall withstand the on-ground operations environment specified in Table 4.4-02 of
[AD13a]. (Pressure, Humidity, Temperature, Cleanliness).

GDIR_R-IFM-1110
The Instruments shall withstand the on-ground operations and handling loads specified in Table 4.403 of [AD13a].

GDIR_R-SYS-0070
Each of the MetOp-SG satellites and their respective instruments shall be designed for a nominal
lifetime in space of at least 7,5 years , including commissioning , validation and calibration.(this
requirements is reported here for sake of completeness , i.e.: definition of the nominal mission
lifetime).

GDIR_R-SYS-0080
Each of the MetOp-SG satellites and their respective instruments shall be provisioned with
consumables for an extended mission lifetime of 9.5 years (7.5 + 2 year).

GDIR_R-SYS-0085
(Mandatory Requirement). Each of the MetOp-SG satellites and their respective instruments shall be
designed, manufactured and qualified to sustain at least 15 years – i.e. corresponding to 2 times the
duration of the nominal operational lifetime – of storage with minimum intervention (typically a once
per year functional test) before having to meet the above stated lifetime requirements (SSRD_RSYS-0280-TAR, SSRD_R-SYS-0300-TAR).

As goal the GDIR indicates: GDIR_G-SYS-0086
Each of the MetOp-SG satellites and their respective instruments shall be designed, manufactured
and qualified to sustain at least 19 years – i.e. corresponding to 2 times the duration of the extended
operational lifetime – of storage with minimum intervention (typically a once per year functional test)
before having to meet the above stated lifetime requirements (SSRD_R-SYS-0280-TAR, SSRD_RSYS-0300-TAR).

GDIR_R-SYS-0088
The Instruments shall meet the requirements of their specification after a minimum on-ground
lifetime, as specified in [AD13b], GDI-50000. (minimum on-ground lifetime of 20 years including up to
15 years in storage).

GDIR_R-STR-0020
The structure shall be designed to cope with the whole satellite operational life including ground
testing, transport, on-ground storage and in-orbit operations. See the details in [AD13b], GDI-299.
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE

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GDIR_R-STR-0130
Mounting interfaces shall allow for easy maintenance, mounting and demounting.

GDIR_R-STR-0140
The layout of the structure shall provide sufficient accessibility to allow for easy integration, removal
and maintenance activities.

GDIR_R-TCS-0120
The Thermal Control design shall take into account the degradation of surface properties (alpha,
epsilon) during the mission lifetime.

GDIR_R-MEC-0100
Mechanism lifetime shall be demonstrated by test using the sum of predicted nominal ground test
cycles (other than lifetime test), cycles during on-ground storage and the in orbit operation cycles.
The number of predicted cycles shall be multiplied by the factors specified in [ECSS-E-ST-33-01C].

GDIR_R-MEC-0101
Mechanisms lifetime qualification tests shall be performed as specified by GDIR_R-MEC-0100 and
by ECSS-S-ST-33-01C, taking into account the Nominal Lifetime in-orbit as specified in GDIR_RSYS-0070.

SSRD_R-MEC-0250
All preloaded elements in mechanisms shall be able to sustain the ground transportation and storage
conditions and durations without affecting performance. This includes also to launch preloads. For
long storage periods alternative solutions shall be provided if needed.

GDIR_R-MEC-1020
For all surfaces pre-loaded together for launch , and/or for storage configurations, special care shall
be taken in materials selection to avoid materials adhesion, fretting or cold welding.

SSRD_R-MEC-0280
Where wet lubrication systems are proposed, specific methods shall be included to avoid lubricant
migration, during on-ground storage and in-orbit operations.

SSRD_R-MEC-0290
The effectiveness and longevity of the systems to avoid lubricant migration shall be demonstrated
with representative tests.

SSRD_R-MEC-0380
The mechanism shall be designed to be maintenance free during ground life including storage. If
specific maintenance and/or refurbishments are unavoidable, these shall be defined, justified and
agreed by the Agency and Airbus DS.

SSRD_R-MEC-0390
Any maintenance operation required at spacecraft level shall be compliant with the nominal
spacecraft configuration and environment during storage.

SSRD_R-MEC-0400
All mechanisms shall be designed to remain installed at spacecraft level during long- term storage.

SSRD_R-MEC-0410
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
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All mechanisms shall be able to perform nominally after the specified storage period on-ground at
satellite level, after completion of all activities at equipments, subsystem and satellite levels prior to
the formal Pre-Storage Review.

SSRD_R-MEC-0420
If mechanism and/or associated lubrication systems require special cleanliness or environmental
constraints (e.g. very low humidity to avoid corrosion) desiccated gas purge ports shall be provided.
These shall be fully accessible throughout all levels of satellite integration, testing and storage.

SSRD_R-MEC-0430
Dedicated purging shall not be required following encapsulation on the Launch Vehicle, or during
short term transportations during AIT activities.

GDIR_R-MEC-1050
If needed, easy replacement of life time expired devices shall be ensured by design.

GDIR_R-ENV-0030
Assembly, ground testing and calibration, transportation and storage environmental conditions shall
be as specified in [SDS02, SDS03, ECSS-Q-20-07A, PSS-01-202 issue 1].

GDIR_R-ENV-0010
The satellites, instruments and their Ground Support Equipments (GSE) shall be protected from or
designed to survive, without performance degradation, the applicable ambient natural environment
during commercial air, sea and road transportation and handling in Europe and at the launch site
(conditions according to GDIR_R-ENV-0030)
.

GDIR_R-ENV-0020
The satellite/Instrument shall be compatible with the contamination and cleanliness conditions
specified for the assembly, ground testing and calibration, transportation and storage.

GDIR_R-ENV-0021
The satellites, instruments and their Ground Support Equipments (GSE) shall be designed to allow
the performance of all on- ground AIV activities, including storage, both in Europe and at the launch
site, in a controlled environment with a minimum cleanliness level of ISO 8 Class as defined in
ECCS-Q-ST-70-01C, Table G-1. .

GDIR_R-ENV-0022
Instruments Suppliers shall provide:
o
o
o

An Instrument Cleanliness and Contamination Control Plan, defining the measures and
methods used at Instrument level to prevent contamination,
An Instrument level Contamination Budget, quantifying the Instrument contamination levels
resulting from the MAIV operations at instrument level, before delivery to the Satellite Prime
Contractor,
A Satellite level Contamination Budget, specifying the Instrument contamination levels
required during the Satellite AIV operations, storage, launch campaign execution, launch
preparation (encapsulation under fairing), launch, in-orbit lifetime operations, together with
the assumed conditions (cleanliness class, duration of each operations). An example of such
a satellite level contamination budget is provided in Table 4 of R-ENV-0022 and shall be
completed by the Instrument supplier.
GDIR_R-ENV-0040
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
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Mechanical and thermal loads induced by the environment during assembly, transportation and
storage shall not establish the dimensioning case for any element of the satellite. This shall be
ensured by the use of adequate means of transportation and protective ground support equipment.

GDIR_R-ENV-0045
During long-term storage, satellites (and instruments if dismounted) shall be kept in an
environmentally controlled and monitored container with dry GN2.

GDIR_R-ENV-0050
The storage and de-storage needs and associated requirements shall be established by the entity
responsible for maintaining the integrity of the performances and reliability.

GDIR_R-ENV-1010
For long term storage (See GDIR_R-SYS-0085; GDIR_G-SYS-0086) of their respective Instruments,
the Instrument Suppliers shall define and specify :
• Storage conditions (Container; Cleanliness; Purging; …)
• Regular maintenance and verification activities (typically once a year),
• Accessibility requirements and constraints.

GDIR_R-GSE-0010
The Ground Support Equipment (GSE) shall be designed and manufactured to support the MetOpSG programme throughout its lifetime including long-term storage, with minimal needs for
refurbishment.

GDIR_R-GSE-0020
The GSE shall include all hardware and software necessary to support the AIV activities at all levels
of integration including the launch campaign and long-term storage.

SSRD_R-AIV-0590
It shall be possible to store the satellite, with the instruments integrated, in a controlled environment
for at least 15 years with no risk of performance or reliability degradation. Storage lifetime is
specified in SSRD_R-SYS-0310-TAR and SSRD_G-SYS-0320-TAR.

SSRD_R-AIV-0600
During storage, a satellite functional test (including the activation of all the mechanisms) shall be
envisaged once per year.
Such functional test shall be a repeat of a baseline functional test performed throughout the AIV
programme, exercising all redundant chains and checking instrument performances.
For mechanism activation, the following sequence have to be considered each time the instrument is
activated :
1) Initial measurement
2) Activation sequence (typically 1 or 2 days of continuous rotation of the mechanism)
3) Final measurement.

SSRD_R-AIV-0610
Provisions shall be made to have witness plates and process manufacturing samples to check the
contamination and the ageing of the satellites and instruments.

SSRD_R-AIV-0620
The witness plates and process manufacturing samples shall be stored together with the satellite /
instrument in identical conditions.

SSRD_R-AIV-0620
The witness plates and process manufacturing samples shall be stored together with the satellite /
instrument in identical conditions.
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
5.3
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REQUIREMENTS DERIVED FROM PA REQUIREMENT FOR SUPPLIER [AD14b]

ECSS-Q-ST-10_MOS-016 – Note 1
Due to the long storage requirements and mission duration for the MetOp-SG system, it is necessary
to retain full visibility of ALL historical NCR’s in case of future anomalies and for future reference.

ECSS-Q-ST-70_MOS-009
a. The supplier shall evaluate the obsolescence risk of materials and processes (e.g. by REACH,
RoHS) throughout its supply chain, establish any such risks and present in the Risk Register, and
inform the project on technical or programmatic implications. Obsolescence related issues shall be
communicated via the MPCB process and reported (e. g. in the DMPL Tool).

ECSS-Q-ST-70_REQ-039
b. The supplier shall identify and evaluate the materials, mechanical parts and processes considered
as long term storage sensitive in the frame of the MPCB process.

ECSS-Q-ST-70_MOS-010
c. The Long Term Storage Plan shall address material performance during the storage period and
identify mechanisms to predict and/or verify material or process or mechanical part performance
throughout the storage period until de-storage and launch campaign activities.
Note: For example this can include adhesive samples stored with the flight adhesives they represent
(i.e. under the same storage conditions), tested at intervals throughout the storage period and
evaluated against initial results and control samples; laminated materials (e.g. magnetics) samples
stored under the same storage conditions, checked for corrosion/delamination during the storage
period and compared to control samples; material samples in a flight representative configuration
that may be prone to Creep during the storage period (e.g. resin/plastic washers) and checked
throughout the storage period for the presence of Creep.
5.4
REQUIREMENTS COMING FROM ECSS-E-ST-33-01C

Maintainability (Chapter 4.2.4.4)
a. The mechanism should be designed to be maintenance free during storage and ground life.
b. If the design is not maintenance free, the maintenance requirements shall be documented in the
SMS, justified, agreed by the customer.
c. If ground maintenance during storage or ground operation is not avoided, the maintenance
procedures shall be provided.

Flushing and purging (Chapter 4.2.6)
a. If operating the mechanism in air is detrimental to the performance of the mechanism over its
complete mission, means for flushing the critical parts with an inert clean dry gas shall be
provided.
NOTE Example of detrimental cause to operate the mechanism in air is the presence of
moisture or other deleterious contamination.
b. Only lubricants qualified in respect to the residual humidity of the dry gas shall be used.

Tribology (Chapter 4.7.3)
It shall be verified that the degradation of the lubricant in the on‐ground and in‐orbit environments
does not lead to a mechanism performance degradation below the limits specified in the Specific
Mechanism Specification.
The effect of exposure to on‐ground storage and related gravity effects, and other ground or in‐orbit
accelerations on lubricant distribution shall be validated.
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
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Doc N°:
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6. GSE SPECIFIC DESIGN REQUIREMENTS

The MWI GSE shall be designed in order to meet the overall MWI programme duration including the long
term storage (for example no corrosion sensitive material will be used for mechanical parts)
The GSE manufacturer shall identify if the GSE storage shall be carried out in the relevant container.
The GSE, when housed in their container, shall be designed for the following non operating storage
conditions:
o Temperature: TBD
o Relative Humidity: TBD
o Shock: TBD
o Pressure : from sea level up to 16000 m
The limited life items shall be identified (e.g. batteries).
Components / Commercial SW shall be procured taking into consideration the obsolescence risks, and
as far as possible, portability on newer generation hardware.
When a GSE with commercial SW is provided, it shall be provided with the last available revision.
To support the long term availability of the GSE it should be based on the use of ESA SCOS.
Upgrade/maintenance requirement of the GSE shall be documented. Detailed maintenance procedures
shall be provided.
Spare parts for the critical items shall be delivered.








6.1
MWI STORAGE CONTAINER SPECIFIC DESIGN REQUIREMENTS
These requirements are applicable in case the instrument is stored in its container at the instrument supplier
facilities (option).





The container design shall be compatible with the long term storage lifetime without degradation of its
structural properties.
The container shall be designed to sustain a number TBD of transportations.
The container shall allow for the monitoring of the internal temperature and humidity without the need of
opening it.
The container internal surface shall be compatible with the storage lifetime, without releasing
particulates, dust or contaminants in excess of TBD.
The container shall allow for dry Nitrogen filling, with a delta pressure of TBD, and a leak rate of less
than TBD.
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MetOp-SG MWI
INSTRUMENT DESIGN CONSIDERATIONS AND
REQUIREMENTS FOR LONG TERM STORAGE
N° Doc:
Doc N°:
MOS-RS-CGS-MWI-0003
Ediz.:
Issue:
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Data:
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7. INSTRUMENT LONG STORAGE CONSTRAINTS
According to the discussion of chapter 4, the following constraints are induced by MWI when integrated on
the satellite:







Need of storage in an environmentally controlled and monitored container with dry GN2 – (See Table
4-2 – Row1 );.
Need of cleanliness test samples – (See Table 4-2 – Row1 );
Need to store some process/hardware witness samples sensitive to long storage in the same
environmental condition of the payload – (See Table 4-2 – Row2 );
Need to be stored with the rotation axis aligned to the gravity vector and with ground locking device
installed (LLD with minimal preloaded applied) – (See Table 4-2 – Row3 );
Need of periodic testing (possibly less or equal test once per year). Periodic testing shall be carried
out based on a procedure and results shall be recorded. The testing orientation shall be with the
instrument rotation axis aligned to the gravity vector and with the main reflector looking to the ground
– (See Table 4-2 – Row4 ). The expected time for periodic testing is 1 week;
Need of de-storage operation implementation before launch. For de-storage operation the instrument
rotation axis aligned to the gravity vector and with the main reflector looking to the ground – (See
Table 4-2 – Row5 ) . The expected time for de-storage is 2 weeks;.
Need to guarantee the instrument accessibility both hardware accessibility and EGSE ports
connection for testing purpose during storage, periodic testing and the de-storage – (See Table 4-2 –
Row3-4-5 ).
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