TM 1-1520-238-23
10-556
10.133.
AFT FUEL CELL NITROGEN INERT CHECK VALVE REMOVAL/INSTALLATION
10.133.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
10.133.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Light duty laboratory apron (item 27, App H)
13/16 x 3/8-inch drive open end socket wrench
crowfoot attachment (item 92, App H)
Chemical protective gloves (item 154, App H)
Adjustable air filtering respirator (item 262, App H)
30 - 150 inch-pound 3/8-inch drive click type torque
wrench (item 441, App H)
Materials/Parts:
Packing with retainer (81)
Petrolatum (item 138, App F)
Sealing compound (item 175, App F)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
10.2
Fuel system safety precautions observed
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened; panel R200 re-
moved
10.30
Aft fuel cell upper vent tube removed
10.133.3. Removal
a. Enter pilot station (para 1.56). Observe all
safety precautions.
b. On pilot center circuit breaker panel, open
ENG INST, FUEL XFEED, and FUEL XFER cir-
cuit breakers.
c. In upper right corner of utility receptacle cir-
cuit breaker panel in main rotor transmission
compartment R200, open NITROGEN INERT
circuit breaker.
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M04-3003-1
