MORTAR SPECIFICATION
Bomb Mortar 81 mm HE
1. GENERAL PURPOSE AND SCOPE
This specification must establish the performance, manufacture, test and acceptance
requirements for Bombs Mortar 81 mm HE with point detonating / Super quick /
delay fuze or equivalent hereafter known as mortar bomb
2. PRINCIPLE DOCUMENTATION
a. Military Specifications
All applicable military specification to be listed here
b. Military standards
All applicable military standards to be listed here. Military Standard
documents to be supplied.
For example:
Mil – Std – 105 E
Sampling procedures and tables for inspection by attributes
Mil – Std – 331
Fuze and Fuze Components, Environmental and Performance Tests for
Fuze Design Safety Hazard Assessment –STANAG 4187 /MIL-STD-1316
c. Military documents
To be specified here
d. Other standards and specifications
To be specified here
e. Applicable documents
Reference Numbers for drawings to be listed here and attached as Annexes
f. Drawings
Reference Numbers for drawings as listed above to be attached as Annexes
g. Technical Product specification
A complete Technical product specification is required in English to include
i. Detailed specification for each component
ii. All relevant quality documents
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ANNEX A
iii. A complete list of all components and materials out sourced including
names and country of origin of the outsourced components / materials.
h. Environmental
All items relating to ammunition & packaging must conform to best
International practise w.r.t to environmental safety and recycling. Compliance
with all Environmental standards to be listed here. e.g. ISO 14001
3. REQUIREMENTS
a. Item definition – Function ,use and deployment
i. Bombs Mortar 81 mm HE with point detonating / Super quick / delay
fuze or equivalent
The Bomb Mortar 81 mm HE with point detonating / Super quick /
delay fuze or equivalent is to be an explosive projectile shot at high
angles of flight. The primary application of the mortar bomb is to be
anti personnel and must be capable of being effectively used against
soft skinned vehicles. The fuze must have a delay option which can be
externally set, which allows penetration of heavily wooded areas and
soft roofs of buildings, when necessary.
On firing of the bomb the fuze must arm on set back and remain safe in
front of the muzzle before being fully armed. The distance in front of
the muzzle that the bomb remains safe must be provided. On
impacting the target area the bomb must detonate instantaneously. If
the delay option is selected the time for detonation to be supplied here.
Fuzes containing a pyrotechnic train (with the exception of the delay
composition) in the detonation sequence shall NOT be accepted.
b. Item diagrams
Cross sectional detailed drawings of mortar bomb and its packaging to be
included here.
c. Interface definitions
Mortar Weapon.
The current 81 mm Long barrel mortar in service with the Defence Forces of
Ireland is the Hotchkiss Brandt 81 mm Long Barrel 81 –MO-61-L (Smooth
bore). It has the following properties
-
inside diameter 81m
Length 1450 mm
Max barrel pressure 800 bar
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ANNEX A
Range tables for all charges must be supplied for this barrel
d. Major components
i. Point detonating / Super quick / delay fuze or equivalent
The Point detonating / Super quick / delay fuze or equivalent must be
double load safe. The fuze must NOT be susceptible to copper azide
corrosion.
The successful company must agree to the conducting of a double
Load test of the fuze during quality audit / acceptance testing.
The construction of the fuze must fulfil all the requirements of the
norm
MIL – STD – 1316
Fuze design, Safety criteria for
STANAG 3525
Design Safety Principles for fuzing systems
The external measurements must fulfil the requirements figure of the
NATO norm.
STANAG 2916
Nose Fuze Contours and matching projectile
The following information is required of the fuze:
1. A complete description of the fuze
2. A complete description of all modes of operation e.g.
mechanism, arming etc
3. All safeties incorporated in the fuze
4. The compositions (incl weights) of all explosive components
contained in the fuze
5. Diagrams / schematics and all its modes of operation of the
fuze.
6. The sealant used between fuze and bomb body.
7. Quality documents for all components and components/
materials outsourced must be supplied.
8. Name of the Manufacturer of the fuze and its identification
designation.
ii. Bomb Projectile Body with Explosive filling
The hollow bomb projectile body must be manufactured to
accommodate the tail fin assembly and fuze ( in conformance with
NATO norm STANAG 2916) . The bomb projectile body is to be of a
spindle shape design.
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ANNEX A
The bomb projectile body must be filled with a High Explosive filling
and painted and marked in accordance with standard NATO markings.
An X-Ray examination of the Bomb Body and HE filling will be
conducted on a representative sample of the ammunition Lot during
acceptance testing to ensure that the HE filling has been filled correctly
and is NOT filled with voids or piping problems.
All quality documents of components must be supplied in English.
All documents relating to the out sourcing of materials for components
must be supplied in English
The following information is required of the HE filling
1.
2.
3.
4.
Chemical compositions (incl weights)
The method of filling in the bomb body
The internal body lacquer between HE filling and bomb body
Quality documents for all components and components
outsourced must be supplied.
5. Name of the Manufacturer of the HE Filling and its
identification designation.
iii. Tail Fin Assembly
The tail fin assembly must provide flight stability to the bomb and
carry the propulsion unit of the bomb. The tailfin must be designed to
accept augmenting charges. The tailfin must be either
1. Manufactured from an extruded aluminium bar as a one-piece
unit. It must be glued and screwed onto the bomb body unit
and torqued to ensure a locked joint
or
2. An integral part of the bomb body.
All quality documents of components must be supplied in English.
All documents relating to the outsourcing of materials for
components must be supplied in English.
iv. Primary cartridge
A complete description is required of the
1. Chemical compositions (incl weights) of each energetic
component
2. Diagrams/schematics of Primary cartridge.
3. Details on sealant used between primary cartridge and tail fin
assembly.
4. Detail on material and sealants used on primary cartridge.
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ANNEX A
5. The maximum and minimum pressures produced following
initiation
6. The history of stability tests conducted
7. Name of the propellant manufacturer and its identification
designation.
8. Quality documents for all components and components
outsourced.
All quality documents of components must be supplied in English.
All documents relating to the outsourcing of materials for
components must be supplied in English
v. Augmenting (Increment ) charges
The augmenting charges must be identically shaped additional charges
capable of being fitted securely on to the tailfin of the bomb body. The
augmenting charges must consist of a celluloid moulded container (or
similar manufacture) filled with ballistite or similar type propellant.
The augmenting charges must be colour coded for easy identification.
The augmenting charges must be capable of being fitted around the
tailfin shaft next to the fin section.
The augmenting charges are to be ignited by the primary cartridge.
A complete description of
1. Chemical compositions (incl weights) of each energetic
component
2. Diagrams/schematics of Primary cartridge
3. The maximum and minimum pressures produced following
initiation
4. The history of stability tests conducted
5. Name of the propellant manufacturer and its identification
designation.
Swabbing Out
After firing 20 rounds at charge 2/3 there should not be sufficient
residue remaining in the bore to cause a misfire. A misfire caused
by debris should be considered a Major DEFECT. Test firing for
residue will occur during quality audit / acceptance testing.
All quality documents of components must be supplied in English.
All documents relating to the outsourcing of materials for
components must be supplied in English
vi. Detonics
All detonics of the bomb must be contained in the fuze. A detailed list
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ANNEX A
of all energetic components to be supplied complete with name of
manufacturer and its identification designation.
vii. Obturator Ring
On firing the ring must expand under pressure to provide a tight seal
between the bomb and barrel. This seal must provide a consistent
pressure and resultant muzzle velocity. This obturator is normally a
polycarbonate split ring on spindle bomb bodies.
viii. Packaging
The packaging must consist of inner and outer containers
manufactured from recyclable material that conforms to all
environmental standards for the storage of ammunition. Inner
packaging to be quiver type container capable of storing two / three
bombs. Outer container to be capable of storing inner quiver
containers to a maximum of six bombs. Ammunition packaging must
be kept to a minimum. The packed containers must be designed for
stacking on top of one another and then palletised on a wooden UN
pallet (or Euro pallet). Packed containers on pallets must be capable of
being stacked on top of each other to a height of three (3) meters.
All chemical protection for packaging used to be listed here.
e. Characteristics
i. Performance characteristics
1. Launching Velocity
Information to be supplied as per table below.
External Ballistic Performance
Charge Velocity
No.
(m/s)
Range
(m)
Accuracy
Longitudal
(m)
Lateral
(m)
All propellant after ignition must be completely consumed and
any resulting contamination and barrel burn out must be so
small that they do not result in any malfunction of the weapon
system.
2. External Ballistic performance
The bomb when fired from the Brandt 81 mm LBM must land
at a distance between 100 m and 5000 m from the firing point.
(This is dependant on the augmenting charge used, the barrel
elevation and the altitude of the firing point above sea level).
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ANNEX A
Typical values must be supplied in tabular form.
3. Terminal ballistic performance
The bomb must detonate on impact either instantaneously or
after a delay time of + 0.05 secs depending on the setting of the
fuze. Details of lethal radius, number of fragments generated
and kinetic energy of fragments on detonation at a distance of
10 m from the point of detonation to be supplied.
4. Dispersion
What is the maximum dispersion in dimensions X (m) and
Y(m) of 10 Bombs mortar at maximum charge under normal
firing conditions using our specified mortar or an alternative
mortar? This will be required to be verified during quality
audit / acceptance tests.
5. Technical Data
The following technical data must be supplied in this format:
Technical data
Functional temperature range
-Storage
-Function
Weight (Flight weight)
Min
Max
Functional elevation range
Propellant gas pressure
Launch acceleration
Average muzzle velocity (V)
Mechanical pre-tube safety time
Mechanical arming time
Flight time
Range
Average dispersion
- Length
- Width
Reaction time
- Instant function
- Delayed function
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ANNEX A
ii. Physical characteristics
All information in relation to weights, dimensions and arming times of
the bomb mortar to be supplied here
iii. Reliability
The mortar bomb must have an operational reliability level of 95%.
What is the % occurrence of a functional or physical failure of a mortar
bomb or an element thereof which may lead to an uncontrolled
explosion and / unsafe functioning? A statement defining reliability
according to the manufacturer to be supplied here.
iv. Range Tables
All technical information must be supplied for the programming of
Hand Held Mortar Fire control systems MORFIRE during quality audit
/ acceptance testing.
A copy of the Range Tables in English to be supplied within each box
of ammunition.
v. Range vs. Height
A chart illustrating trajectories of the mortar bomb when fired at an
elevation of 45 degrees in a 81 mm Mortar barrel ( length 1450 mm) at
the different charges. The following information to supplied at
different charges
Charges
Velocities (m/s)
Pressures (Kg/cm2)
vi. Maintainability
The ammunition must be maintenance free for a minimum of 10 years
while contained in the specifically designed packaging and stored in
temperature conditions ranging between – 10 degrees C and 50 degrees
C.
The shelf life of each component to be listed. The shelf life of the
Bombs mortar to be stated.
vii. Environmental conditions
The 81 mm HE Mortar bomb must be resistant, safe and functional
under all environmental conditions in accordance with MIL-STD-331.
These tests to include
1. Transport Vibration.
The bombs must be capable of withstanding a transport
vibration test
2. Temperature extremes
The bombs must be capable of being stored and fired in
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ANNEX A
temperature extremes between –20 degrees C and + 60 degrees
C without deleterious effect.
3. Salt Spray
The bombs must be capable of withstanding the salt spray test
4. Water tightness test.
The bombs must be capable of withstanding the water tightness
test before lot acceptance test
viii. Transportability
When the ammunition is packed and palletised, it must be capable of
being stored, transported by road, rail, ship or aircraft without any
detrimental effect to its functional and safety characteristics. Any
ammunition packed in containers must be secured and shored to
prevent accidental spillage.
f. Design and construction
i. Materials, processes and parts
1. Materials
All materials used must comply to the specifications agreed and
approved upon and shall be accepted and tested according to
these specifications. All documents relating to the out sourcing
of materials for components must be supplied in English
2. Manufacturing Processes
All manufacturing processes must be such that a Lot or Batch
of ammunition can be assembled and its components
manufactured in one continuous and unchanged process. The
process must be capable of manufacture within the dimensional
and attributed requirements for characteristics that influence
safety, form, fit and function parameters of the ammunition and
include control measurements which are capable of identifying
any changes in the process from its inherent capabilities.
3. Parts and Assemblies.
All parts and assemblies are to be in conformance with the
conditions and qualities as specified on the applicable drawings
and specifications.
ii. Electromagnetic compatibility
The mortar bomb must not be influenced by electromagnetic fields
generated in its immediate environment.
iii. Identification and marking.
The mortar bomb is to be painted and marked in accordance with
approved marking drawings, NATO standard markings and to client
specification.
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ANNEX A
iv. Workmanship.
The workmanship and finish is to be of an acceptable quality and in
conformance with standards used and expected in manufacturing
military ammunition in accordance with International Best Practise.
v. Interchangeability
All components must be interchangeable for assembly purposes.
vi. Safety
1. Muzzle safety.
The fuze must not arm up to a minimum distance ( to be
specified here) from the muzzle of the mortar barrel when fired
at charge 0. This test is to be conducted during fuze Lot
acceptance. Military Standard test reference to be listed and
submitted.
2. Body safety.
Empty bomb bodies are to be subjected to an internal pressure
test during the manufacture process. Certification of test results
conducted to be supplied. Military Standard test reference to be
listed and submitted.
3. Double Load
The fuze must have a double load safety feature, which will
prevent detonation in the case of accidental double loading of
mortar bombs in the barrel. Double Load test to be conducted
during quality audit / ammunition acceptance tests. Military
Standard test reference to be listed and submitted.
4. Drop Safety
The ammunition must safely withstand a drop from 1.5 m both
in its inner packing and without its inner packing. Military
Standard test reference to be listed and submitted.
vii. Engineering Design
The design and construction of the ammunition must be such that there
are no additional precautions to be employed by the user other than
standard Ammunition and Explosive Regulations.
g. TECHNICAL AND TRAINING MATERIALS
i. Technical, Training and Instruction Materials (in English) must be
made available as part of the contract. Specification, layout, electronic
software (CDs, Charts, Software Programs etc.) and quantities to be
agreed with customer prior to the awarding of contract
ii. There is a requirement for the following to be supplied as part of the
contract
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ANNEX A
1.
2.
3.
4.
10 x Inert rounds c / w drawings
10 x Sectioned rounds c / w drawings
4 x sectioned Fuzes c / w drawings
Operation and Function sequences of bomb and fuze on CD.
h. QUALITY ASSURANCE PROVISIONS
i. General
1. Responsibility for tests
The manufacturer shall be responsible for the provision to an
acceptance authority all gauges and target facilities necessary
for the performance of the acceptance inspection of the
complete mortar bomb.
The acceptance authority reserves the right of inspection of
Laboratory analysis certificates as well as production quality
control certificates of raw materials and components used
during the manufacturing of the applicable lot of ammunition
The manufacturer shall use their own facilities or any
commercial laboratory. The manufacturer shall be responsible
for advising the client of the date, time and location of the
required inspections and it is the client’s responsibility to
ensure attendance of this representative, if required, at his own
cost.
The Director of Ordnance reserves the right to conduct a
Quality Assurance Audit prior to the awarding of any contract.
A test firing of ammunition may occur during this audit at the
manufacturers location.
The Department reserves the right to procure 100 Bombs
Mortar for the Director of Ordnance for evaluation in Ireland as
part of the tender evaluation
The successful manufacturer must be capable of conducting
firing tests on a Hotchkiss Brandt 81 mm Long Barrel 81 –MO61-L (Smooth bore) during acceptance tests. A Hotchkiss
Brandt 81 mm Long Barrel 81 –MO-61-L (Smooth bore) will
be supplied if necessary. The Country of the manufacturer /
location of the acceptance tests must be capable of importing a
Hotchkiss Brandt 81 mm Long Barrel 81 –MO-61-L (Smooth
bore) for duration of acceptance tests if necessary.
2. Certificates
The manufacturer shall be responsible for the performance of
all inspections and tests to ensure that the bombs produced by
him are fully in accordance with the specification. The
manufacturer shall provide to the client when submitting a lot
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ANNEX A
of ammunition for acceptance the following certificates
a. Certificate of Conformance
This certificate shall state that the whole of the supplies
detailed thereon have been subject to planned close
control of all supply and manufacturing activities, and
have been inspected and tested in accordance with this
specification.
It shall state:
i.
ii.
iii.
iv.
The number of units of product inspected
The results of inspection
The number of items in the Lot
The date submitted.
b. Release Certificate.
The release certificate of the propellant used and its
manufacturer.
c. Ammunition Record Sheet
This certificate will consist of a detailed list of
components reflecting lot numbers, date of manufacture
and manufacturer’s monogram of each controlled
released item used during production of the applicable
batch.
d. Quality Documentation
All relevant quality documents of components must be
supplied in English.
All documents relating to the outsourcing of materials
for components must be supplied in English.
e. Tabular Information
All relevant information in attached Table to be
completed in same format (See Annex A1 attached)
ii. Quality conformance inspection and tests
1. Tests to accept sub assemblies from suppliers
Sampling inspections to accept sub assemblies from suppliers
are to be performed on items when received from suppliers.
2. Test methods for the mortar bomb
All tests conducted on 81 mm HE Mortar Bomb to be listed.
Test reference standards to be listed. Tests as per MIL-STD
331 or similar acceptable standard to include
a. Mechanical tests
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ANNEX A
b.
c.
d.
e.
f.
g.
Vibration tests
Visual and Dimensional Tests
Environmental & climatic Tests
Safety, arming and functioning tests
Static Tests
Dynamic Tests
i. PREPARATION FOR DELIVERY
i. General
On completion of all inspections and tests the ammunition shall be
packed and palletised according to customer’s orders and
specifications.
ii. Detailed preparation
1. Preservation and packaging
The packaging must consist of inner and outer containers
manufactured from recyclable material that conforms to all
environmental standards for the storage of ammunition.
Ammunition packaging must be kept to a minimum. The
packed containers must be designed for stacking on top of one
another and then palletised on a wooden UN pallet (or Euro
pallet). Packed containers on pallets must be capable of being
stacked on top of each other to a height of three (3) meters.
2. Marking for shipment
as per specification
3. Explosives classification
All relevant information to be supplied
IMDG Code:
Ammunition
UN No.
Hazard Division
Compatibility Group
NEQ
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ANNEX A