TM 1-1520-238-23
16-4
Change 8
SECTION I.
EXTERNAL STORES/PYLONS MAINTENANCE
16.1.
PYLON INSPECTION
16.1.1. Description
This task covers:
Inspection.
16.1.2. Initial Setup
Tools:
Electrical tool kit (item 378, App H)
Light duty laboratory apron (item 27, App H)
Chemical protective gloves (item 154, App H)
5X & 12X monocular magnifier (item 206, App H)
Adjustable air filtering respirator (item 262, App H)
0 - 100 pound spring resiliency tester (item 352, App H)
Personnel Required:
68X
Armament/Electrical System Repairer
68X3F
Armament/Electrical System Repairer/
Technical Inspector
References:
TM 1-1500-204-23
TM 1-1520-264-23
TM 43-0001-39
TM 55-1500-323-24
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
16.1.3. Inspection
a. Check pylon hollow pin for damage.
(1) Measure outside diameter of hollow pin approximately 5/8 INCH from each end. The diameter shall be no
less than 1.434 INCHES or out of round by no more than 0.001 INCH. If out of tolerance replace hollow pin.
Use caliper set.
(2) Check bushing interface surface area for scoring or metal transfer. None allowed. Use magnifier.
b. Check pylon frame assembly for cracks on both inboard and outboard sides. Use magnifier around pivot
pin area and up arm of frame. No cracks allowed. If cracks are suspected, perform nondestructive inspection
(TM 1-1520-264-23).
c. When disassembled, rack inspection area shall be mounting area around pivot point, extending
outward four inches onto rack surface. Inspection shall be performed internally and externally.
d. Check wire harness for broken or frayed wires; loose or damaged connections, and loose, damaged,
or missing clamps (TM 55-1500-323-24).
e. Check aerial bracket for cracks. None allowed.
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