TM 1-1520-238-23
10-536
10.128.
NITROGEN INERTING UNIT (NIU) PRESSURIZED AIR SUPPLY INLET HOSE
REMOVAL/INSTALLATION
10.128.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
10.128.2. 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
TM 9-1090-208-23
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access panel R200 re-
moved
1.22
Fuel system vented
TM 9-1090-208-23
Ammunition storage maga-
zine removed
10.128.3. 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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