TM 1-1520-238-23
10-534
10.127.
NITROGEN INERTING UNIT (NIU) PRESSURIZED AIR SUPPLY HOSE
REMOVAL/INSTALLATION
10.127.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
10.127.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
30 - 150 inch-pound 3/8-inch drive click type torque
wrench (item 441, App H)
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
2.2
Access doors T250L, T250R, T290L, and
T290R opened; access fairing L325 re-
moved; access panel R200 removed;
1.22
Fuel system vented
10.127.3. Removal
a. Enter pilot station (para 1.56). Observe all
safety precautions.
b. On center circuit breaker panel, open ENG
INST, FUEL XFEED, and FUEL XFER circuit
breakers.
c. In upper right corner of utility receptacle cir-
cuit breaker panel in main rotor transmission
compartment R200, open NITROGEN INERT
circuit breaker.
d. Remove nitrogen inerting pressurized air sup-
ply hose (1).
(1) Hold pressurized air supply manifold T-fitting
(2). Remove hose nut (3).
(2) Remove hose (1) from T-fitting (2).
(3) Hold deck fitting (4). Remove hose nut (5).
(4) Remove hose (1).
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