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Page Title:
Maintenance Module Requirements |
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|  MIL-D-81347C(AS)
Maintenance Module - A maintenance module shall be defined as
3.3.7.2.1
the least complex segment of each part of the DPS which is capable of being removed and reinserted
within the DPS through the use of a connector or captive mounting bolts/screws rather than by solder-
ing (brazing) or welding.
3.3.7.2.1.1
Maintenance Module Requirements
(1) A module shall be packaged in such form that it can be
plugged into and removed from its subunit (functional group of maintenance modules) or assembly
without the use of special tools.
(2) A maximum of 46 different modules shall be used in Logic
Units 1, 2, 3 and 4, exclusive of their power supplies and the Magnetic Drum Memory Subassembly.
Subunit - A subunit is a functional group of maintenance modules.
3.3.7.2.2
Each subunit containing its associated maintenance modules shall be either a single plug-in, remov-
able assembly, or due to size or packaging limitations, a number of plug-in, removable assemblies.
Subunit Types - The types of subunits shall be as specified herein.
3.3.7.2.3
3.3.7.3
Maintainability Requirements
Maintainability Philosophy - To provide for increased system
3.3.7.3.1
effectiveness, maintainability y shall receive equal considerate ion with such factors as cost, physical
parameters, and reliability. The maintenance philosophy for avionics equipment is that of fault iso-
lation to and repair by replacement of individual modules without removing the units from the opera-
tional environment in the aircraft. Where feasible, fault isolation shall be computer initiated utilizing
a diagnostic program. Where not feasible, equipments shall provide self-test features and readily
accessible test points to accommodate standard test equipment affording fault isolation to the individual
replaceable module.
Fault Detection and Isolation
3.3.7.3.2
3.3.3.2.1
Operator Methods
Three methods of fault detection and isolation for each subunit of
the DPS (excluding power supplies and Maintenance Control Panels) and associated peripherals shall
be provided:
(1) Integration Test
(2) System Test Program
(3) Maintenance Control Panel Tests
The associated peripherals shall be defined as the external devices
to which the subunit interface. The associated peripherals for the DPS subunits are defined as follows:
TACCO Tray, Sensor Station 3 Control Tray, Universal Keysets, Pilot Keyset, Ordnance Panel, ARO
Display, Armament/Ordnance Test Panel, Magnetic Tape Transport, TACCO and Sensor Station 3
Multipurpose Displays, Pilot Display, Auxiliary Display, and Omega.
3.3.7.3.2.2
Integration Tests
The Integration Tests shall utilize the computer, the Maintenance
Control Panel and the subunit external test points for the detection of malfunctions in the communica-
tion paths between equipments. The Integration Tests shall consist of a series of short programs or
subroutines, operator initiated, interspersed by manual checks to exercise all communication paths
between the computer, DPS, and associated peripherals. The Integration Test snail be used primarily
during the initial integration of a given equipment into the total system and will therefore require a
high degree of operator training.
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