TM 1-1520-238-23
12-102
Change 7
SECTION III.
FIRE EXTINGUISHING SYSTEM MAINTENANCE
12.33.
FIRE EXTINGUISHING SYSTEM INSPECTION
12.33.1. Description
This task covers:
Inspection.
12.33.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Light duty laboratory apron (item 27, App H)
Chemical protective gloves (item 154, App H)
Industrial goggles (item 156, App H)
Adjustable air filtering respirator (item 262, App H)
Materials/Parts:
Acetone (item 1A, App F)
Brush (item 34, App F)
Corrosion removing compound (item 64B, App F)
Epoxy primer coating kit (item 77, App F)
Mat (item 122, App F)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 55-1500-323-24
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors T250L, T250R, T290L,
T290R, and L325 opened
12.33.3. Inspection
a. Check engine fire pull switches for cracks and
broken or loose terminals. None allowed.
b. Check fire bottle select switch for illegible let-
tering and loose mounting. None allowed.
c. Check thermal discharge indicator disk for
cracks or missing disk. None allowed.
d. Check check valves for cracks and stripped or
damaged threads. None allowed.
e. Check check valves for nicks, scratches, and
marks. Minor surface damage that does not ex-
ceed a depth of 0.040 INCH or 10 percent of
material thickness, is permissible.
f. Check the interior of two way check valves for
evidence of cracks, pitting, corrosion and
evaporation.
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