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Page Title:
Definition of Line Replaceable Units (LRU) |
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|  MIL-N-81497A(AS)
Definition of Line Replaceable Units (LRU) - The
3.3.7.2.1
LRU'S shall be defined as follows:
Gyroscope Assembly
Computer, Navigation
Power Supply
Indicator, Position
Control, Navigation
Control, Gyroscope Assembly
Battery
Flight Line, Maintenance - Additional Capability -
3.3.7.2.2
The Power Supply and Computer, Navigation shall contain external
test connectors which when coupled with standard test equipment can be
used to identify and isolate malfunctioning modules or groups of modules
while mounted in the aircraft. Access doors on the Power Supply and
Computer, Navigation shall be provided to permit rapid removal and
replacement of selected modules or groups of modules without the removal
of the equipment from its mounted position. Where possible, the cap-
ability shall be provided for in-aircraft fault isolation to the module
level of each unit, module replacement and equipment checkout within a
maximum elapsed time of 90 MIN. The Power Supply shall, in addition,
have exposed test points to facilitate unit checkout.
3.3.7.3
Removable Cam Compensator - The equipment shall be
designed to permit removal and replacement of the magnetic heading cam
compensator from the Control, Gyroscope Assembly when installed in the
aircraft.
Control Panel Covers - All control panels shall have
3.3.7.4
quick disconnect removable covers to facilitate unit repair.
Intermediate Maintenance - The equipment shall be
3.3.7.5
such that shop repair actions can be accomplished to include module
removal and repair to the component level.
Nomenclature and Nameplates - Nomenclature assignment
3.3.8
and nameplate approval for equipment identification shall be in accord-
ance with MIL-N-18307.
Standard Conditions - The following conditions shall
3.3.9
be used to establish normal performance characteristics under standard
conditions and for making laboratory bench tests.
Room ambient (25 5 degrees
Temperature:
Centigrade (DEG C)
Normal Ground
Altitude:
None
Vibrations
Room ambient up to 90
Humidity:
percent relative humidity
7
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