Equipment redundancy
The concept of redundancy of certain components or
systems is quite common in engineering design of systems where
a high reliability is desirable.
1---What concept use In certain components or systems where
a high reliability is desirable in design?.
A:LRU. B:DDG c: redundancy
In the case of redundant units—usually called primary and
backup units—if one unit fails, the other is available to take over
the function.
For example, in aviation most commercial jets have two
high-frequency (HF) radios. Only one is needed for
communications but the second one is there for backup in case
the first one fails.
2-Backup units design FOR take over the function when only. …..
unit is ……..
A:Maine. availabl B: primary- fails c:secondary -not available
Line Replaceable Unit
Another common concept used in aviation is the line
replaceable unit (LRU). An LRU is a component or system that
has been designed in such a manner that the parts that most
commonly fail can be quickly removed and replaced on the
vehicle.
This allows the vehicle to be returned to scheduled service
without undue delay for maintenance. The failed part, then, can
either be discarded or repaired in the shop as necessary without
further delaying the flight.
Minimum Equipment List (MEL)
The third concept for minimizing delays for maintenance in
aviation is known as the minimum equipment list (MEL). This list
allows a vehicle to be dispatched into service with certain items
inoperative provided that the loss of function does not affect the
safety and operation of the flight.
3-concepts that use for minimizing delays for maintenance
A:WCCR-MEL-OTIR-CDL
B:CDL-MEL –LRU-MMEL
C:MEL-AMM-DDG-LRU
These items are carefully determined by the manufacturer and
sanctioned by the regulatory authority during the early stages of
vehicle design and test.
4-WHICH items are determined by the manufacturer in early stages of
design and test.
A:mel
B:mmel
C:wccr
5-which document can be issues by The airline own aircraft
configuration for minimizing delays for maintenance?
A:cdl
B:mel
C: ddg
The manufacturer issues a master minimum equipment list
(MMEL) which includes all equipment and accessories available for the
aircraft model.
Minimum Equipment List (MEL)
The airline then tailors the document to its own configuration to
produce the MEL. Many of these MEL items are associated with
redundant systems.
9-Most of the …..items are associated with ………..
A:ddg/,cdl
B:Mel/, redundant systems
C:lru/,cdl
The concept of the MEL allows deferral of maintenance without
upsetting the mission requirements. The maintenance, however, must
be performed within certain prescribed periods;
Category A →before next flight or remarks
Category B → 3 days
Category C → 10 days
Category D → 120 days
6-Which one is correct about time limit in Mel processors ?
a: CatA :before next flight
B:cat a=24 hours after remark
C:cat c= 30days
Minimum Equipment List (MEL)
Associated with the MEL is a dispatch deviation guide (DDG)
that contains instructions for the line maintenance crew when the
deviation requires some maintenance action that is not necessarily
obvious to the mechanic.
7-Instruction that use in Mel called:
a: amm
B:mmel
C:ddg
A dispatch deviation guide is published by the airplane
manufacturer to instruct the mechanic on these deviations.
The DDG contains information such as tying up cables and
capping connectors from removed units, opening and placarding
circuit breakers to prevent inadvertent power-up of certain equipment
during flight, and any other maintenance action that needs to be
taken for precautionary reasons
Configuration Deviation List (CDL)
This list provides information on dispatch of the airplane in
the event that certain panels are missing or when other
configuration differences not affecting safety are noted.
Although failures on these complex aircraft can occur at
random, and can come at inopportune times, these three
management actions—redundancy of design, line replaceable
units, and minimum dispatch requirements—can help to
smooth out the workload and reduce service interruptions
8-purpose of management action (Mel.lru,redundancy of design)
A:reduce humans error
B:smooth out the workload and reduce service interruptions
C:reduce natural entropy
Questions:
1. The mechanic responsibility is :
a. Reduce natural entropy
b. Increase inherent reliability
c. Maintained inherent reliability
d. All of the above
2. The mechanic responsibility is :
a. Increase natural entropy of system
b. Prevent from decreasing the total entropy of the system
c. To combat the continual increase in entropy during the
operational lifetime of the equipment.
3. The concept of the ……. allows deferral of maintenance
without upsetting the mission requirements.
a. LRU
b. Reliability
c. MEL
d. Maintenance program
4. MMEL issue by
a. Airline and approved by authority
b. Manufacturer and approved by state of manufacturer
c. designer and approved by state of design
d. Airline and approved by state of design
5. A component or system that has been designed in such a
manner that the parts that most commonly fail can be
quickly removed and replaced on the vehicle refer to as:
a. MEL
b. CDL
c. LRU
d. MMEL
6. The designed-in level of perfection is known as the:
a. Inherent reliability
b. Ultra safe design
c. Approved design
d. Redundant design
1---What concept use In certain components or systems where a
high reliability is desirable in design?.
A:LRU.
B:DDG
c: redundancy
2-Backup units design FOR take over the function when only. ….. unit is
……..
A:Maine. availabl
B: primary- fails
c:secondary -not available
3-concepts that use for minimizing delays for maintenance
A:WCCR-MEL-OTIR-CDL
B:CDL-MEL –LRU-MMEL
C:MEL-AMM-DDG-LRU
4-WHICH items are determined by the manufacturer in early stages of
design and test.
A:mel
B:mmel
C:wccr
5-which document can be issues by The airline own aircraft
configuration for minimizing delays for maintenance?
A:cdl
B:mel
C: ddg
6-Which one is correct about time limit in Mel processors ?
a: CatA :before next flight
B:cat a=24 hours after remark
C:cat c= 30days
7-Instruction that use in Mel called:
a: amm
B:mmel
C:ddg
8-purpose of management action (Mel.lru,redundancy of design)
A:reduce humans error
B:smooth out the workload and reduce service interruptions
C:reduce natural entropy
9-Most of the …..items are associated with ………..
A:ddg/,cdl
B:Mel/, redundant systems
C:lru/,cdl
10-The mechanic responsibility is :
a. Reduce natural entropy
b. Increase inherent reliability
c. Maintained inherent reliability
11-The mechanic responsibility is :
a. Increase natural entropy of system
b. Prevent from decreasing the total entropy of the system
c. To combat the continual increase in entropy during the
operational lifetime of the equipment
12-. The concept of the ……. allows deferral of maintenance
without upsetting the mission requirements.
a. LRU
b. Reliability
c. MEL
13- MMEL issue by
a. Airline and approved by authority
b. Manufacturer and approved by state of manufacturer
c. designer and approved by state of design
14- A component or system that has been designed in such a
manner that the parts that most commonly fail can be
quickly removed and replaced on the vehicle refer to as:
a. MEL
b. CDL
c. LRU
15- The designed-in level of perfection is known as the:
a. Inherent reliability
b. Ultra safe design
C. Redundant design