TM 55-1520-240-23-6
7-147.2
INSTALL AIR CHARGING VALVE AND PRESSURE GAGE ON APU START ACCUMULATOR
7-147.2
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanics Tool Kit, NSN 5180-00-323-4692
Torque Wrench, 100 to 750 Inch-Pounds
Materials:
Lockwire (E231)
Petrolatum (E274)
Parts:
Preformed Packings
Retainers
Personnel Required:
Medium Helicopter Repairer
Inspector
References:
TM 55-1520-240-23P
When tightening nut, do not turn it
past the non-threaded portion of the
fitting. Packing will rise onto threads
and eventually leak.
Prior to installation, check pressure
gauge vent hole for freedom of
obstructions. There shall not be
anything covering vent hole.
NOTE
Apply a light coating of petrolatum
(E274) or fluid (E199) to threads,
packings, and retaining rings during
assembly.
INSTALL PRESSURE GAGE
1.
Install nut (1) on union (2). Position retainer (3)
and packing (4) on union.
2.
Install gage (5) on union (2).
3.
Torque nut (1) to 135 inch-pounds.
7-655