TM 1-1520-238-23
Change 9
1-391
1.137.
SPECIAL INSPECTION CHECKLIST – continued
Helicopter Serial No.:
Date:
Area
No.
Special
Inspection
No.
REQUIREMENT
EVERY
Item
Status
5
31
IF AIRCRAFT HAS BEEN OPERATED IN A LOOSE GRASS ENVIRONMENT
a. Perform ENCU cleaning as required (para 1.48).
ALL
32
AFTER KNOWN OR PROBABLE WIRE STRIKE
If voids or delamination are suspected, perform nondestructive inspection
(TM 1-1520-264-23).
a. Check wire strike deflectors for bends, cracks, and alinement. Replace if
damage is found.
b. Check wire strike cutters for bends, cracks, and alinement. Replace if
damage is found.
c. Check mounting areas for cracks and deformation of structure and
attaching fasteners. Repair if damage is found (TM 1-1500-204-23).
ALL
33
AFTER KNOWN OR SUSPECTED LIGHTNING STRIKE
If voids or delamination are suspected, perform nondestructive inspection
(TM 1-1520-264-23).
NOTE
Following a known or suspected lightning strike perform the following
inspection and operational checks prior to next flight.
Lightning strike damage can be distinguished from other damage,
such as gouging, denting, or erosion, because it normally appears as
a blackened surface, pit, or hole with a burned rim.
Lightning is attracted to sharp objects. Pay close attention to protru-
sions, sharp corners, and outer surfaces, such as main and tail rotor
tips and trailing edges, electrostatic dischargers, and antennas.
a. PRELIMINARY LIGHTNING STRIKE INSPECTION REQUIREMENTS
(1) Check surfaces of main rotor blades and main rotor hub assembly;
including lead lag link joints, pitch housings, droop stop mechanisms,
hub, dampers, controls, and swashplate assemblies for evidence of
lightning damage.
GO TO NEXT PAGE
