TM 55-1520-240-23-1
1-92
INSPECTION
(Continued)
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REF.
NO.
AREA
NO.
FREQUENCY
INSPECTION REQUIREMENTS
(8) Rotary wing heads, pitch links, and controls for cracks, nicks, and
distortion.
(9) Upper dual boost actuators for leakage. Attachment fittings for
cracks and security.
55.
6, 7
WHEN ROTOR SPEED EXCEEDS 115 PERCENT:
a. Replace the forward and aft rotary wing heads, including vertical hinge pins.
Identify heads as overspeeding. Return to depot.
b. Inspect each blade for obvious damage (Task 5-63.1). If any damage is
evident, blade is not acceptable for flight. If no damage is evident, blade is
acceptable for flight.
55.1.
6, 7
WHEN ROTOR RPM EXCEEDS 111 PERCENT, BUT DOES NOT EXCEED 115 PERCENT RPM:
Inspect the rotor head tie bar assemblies per Task 5-23.1.1 at the next rotor
head removal, but NLT than completion of next phased maintenance.
56.
6, 7
WHEN A ROTARY WING BLADE HAS BEEN STRUCK BY LIGHTNING:
Perform lightning strike inspection (Tasks 2-5 and 5-63.2).
57.
6, 7
WHEN A ROTARY WING BLADE HAS BEEN FLAPPING DUE TO HIGH WINDS:
Inspect rotor system (Task 5-63.3).
57.1.
6, 7
PRIOR TO INSTALLATION OF ROTARY WING HEAD ASSEMBLY P/N 145R2003-9 (FWD) AND/OR
P/N 1452004-18 (AFT):
Visually inspect bushings P/N 145R3116-10 for slipping/looseness.
57.2
6, 7
PRIOR TO INSTALLATION OF ROTARY WING HEAD ASSEMBIES:
Rotor hubs with lightening holes only, perform eddy current inspection and
inspect the area surrounding the vertical web.
58.
6, 7
WHEN A ROTARY WING HEAD IS SUSPECTED OF EXCESSIVE OIL LEAKAGE:
Perform an oil leakage tolerance check (Task 5-5).
59.
6, 7
WHEN A ROTARY WING HEAD IS REPLACED OR REINSTALLED AFTER THE FIRST FLIGHT:
a. Tang washer and lock-ring for proper installation and security (Task 5-9).
b. Retaining nut for specific torque (Task 5-9.1).
60.
6, 7
WHEN THE AIRSPEED LIMITATION, WITH LONGITUDINAL CYCLIC TRIM ACTUATORS RETRACTED
AS SPECIFIED IN TM 55-150-240-10, CHAPTER 5, HAS BEEN EXCEEDED:
a. With forward actuator retracted, inspect forward rotor heal and droop stops
for damage.
b. With aft actuator retracted, replace the aft rotary wing driveshaft only if gross
weight exceeds 40,000 pounds (Tasks 6-56 or 6-57 and 6-62 or 6-63).
61.
7, 10
WHEN THE FLIGHT CONTROLS HAVE BEEN MOVED OR THE HYDRAULIC PRESSURE IS REMOVED
WHILE RIGGING PINS ARE INSTALLED:
Perform the inspection for damage following movements of flight controls with
rigging pins installed (Tasks 11-19 and 11-20).
62.
6, 7
WHEN A FORWARD OR AFT LCT ACTUATOR IS REPLACED:
Perform LCT actuator operational check (affected system only). Refer to TM
55-1520-240-T-3, Task 11-3.34.1 for forward and Task 11-3.34.2 for aft.
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