TM 1-1520-238-23
8-110
SECTION III. NAVIGATION INSTRUMENTS MAINTENANCE
8.41.
NAVIGATION INSTRUMENTS INSPECTION
8.41.1. Description
This task covers:
Inspection.
8.41.2. Initial Setup
Personnel Required:
68X
Armament/Electrical System Repairer
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access doors opened and covers, panels,
and fairings removed as necessary
8.41.3. Inspection
a. Check navigation instruments and instrument panel mounting areas for dents, nicks, and cracks. None
allowed.
b. Check front panels of instruments for dents, nicks, and cracks. None allowed.
c. Check instruments and their front panels, covers, indicators, switches, and knobs for loose installa-
tion. None allowed.
d. Check instruments for loose or missing hardware. None allowed.
e. Check screw holes of instruments and mounting brackets for stripped or damaged threads. Acceptable
thread damage cannot exceed 50 percent of one thread.
f. Check indicators on instrument faces for wear and damage. None allowed.
g. Check instrument scales for wear, readability, distortion, and discoloration. None allowed.
h. Check electrical connectors for loose installation. None allowed.
i. Check lockwire for loose or broken wires. None allowed.
j. Check instruments for fogging and moisture. None allowed.
k. Secure opened access doors; install removed access panels, covers, and fairings (para 2.2).
END OF TASK
