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Section I. INTRODUCTION
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TM-55-4920-431-23P Auxiliary Power Unit Electronic Sequence Unit Multi-Purpose Test Set Part Number 161226-200 Manual
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Maintenance Code

TM 55-4920-431-23P
Code
Definition
PA
- Item procured and stocked for anticipated
or known usage.
PB
- Item procured and stocked for insurance
purpose because essentiality dictates that
a minimum quantity be available in the
supply system.
PC
- Item procured and stocked and which other-
wise would be coded PA except that it is
deteriorative in nature.
PD
- Support item, excluding support equipment,
procured for initial issue or outfitting
and stocked only for subsequent, or addi-
tional initial issues or outfittings. Not
subject to automatic replenishment.
PE
- Support equipment procured and stocked for
initial issue or outfitting to specified
maintenance repair activities.
PF
- Support equipment which will not be stock-
ed, but which will be centrally procured
on demand.
PG
- Item procured and stocked to provide for
sustained support for the life of the
equipment. It is applied to an item pecu-
liar to the equipment which, because of
probable discontinuance or shutdown of
production facilities would prove uneco-
nomical to reproduce at a later time.
KD
- An item of a depot overhaul/repair kit
and not purchased separately. Depot kit
defined as a kit that provides items re-
quired at the time of overhaul of repair.
KF
- An item of a maintenance kit and not pur-
chased separately. Maintenance kit de-
fined as a kit that provides an item that
can be replaced at unit or intermediate
levels of maintenance.
KB
- Item included in both a depot overhaul kit
and a maintenance kit.
MO
- Item to be manufactured or fabricated at
unit level.
MF
- Item to be manufactured or fabricated at
the intermediate maintenance level.
MD
- Item to be manufactured or fabricated at
the depot maintenance level.
AO
- Item to be assembled at unit level.
AF
- Item to be assembled at intermediate
maintenance level.
AD
- Item to be assembled at depot maintenance
level.
2

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