TM 55-1520-240-23-1
1-92
INSPECTION
(Continued)
1-92
REF.
NO.
AREA
NO.
FREQUENCY
INSPECTION REQUIREMENTS
b. Replace the combining transmission if 150 percent torque is exceeded on
either engine or 260 percent total torque from both engines is exceeded.
c. Inspect engine if 154 percent torque is exceeded on that engine. Refer to
TM 55-2840-254-23.
d. Replace the forward and aft transmissions if 260 percent total torque from
both engines is exceeded.
39.
4, 5,
6, 7, 8
WHEN TRANSIENT (NEVER EXCEED) TORQUE LIMITS HAVE BEEN EXCEEDED:
a. Replace any engine transmission if 154 percent torque is exceeded on
that transmission.
b. Replace the combining transmission if 154 percent torque is exceeded
on either engine.
c. Inspect any engine if 154 percent torque is exceeded on that engine. Refer
to TM 55-2840-254-23.
d. Replace the forward and aft transmissions if 300 percent total torque from
both engines is exceeded.
40.
6
AT INSPECTION PHASE NEAREST 300 HOURS OF AIRCRAFT OPERATION SINCE INITIAL OR
SUBSEQUENT AFT PYLON INSTALLATION:
Retorque bolts NAS628 and nuts in the aft pylon-to-airframe splice (backed off
and retightened) to specified torque.
41.
4, 5,
6, 7,
8, 10
WHEN THE TRANSMISSION OIL TEMPERATURE EXCEEDS 140ºC OR THE #1 OR #2 ENGINE XMSN
HOT INDICATOR LIGHTS:
a. Functionally check the affected oil temperature indicating system. Refer
to TM 55-1520-240-T.
b. If the indicating system is satisfactory, replace the transmission (Tasks 6-46,
6-51, 6-72, 6-77, 6-92, 6-97, 6-100, 6-107.)
c. Determine the cause of overheating.
42.
6, 7
WHEN ANY MAJOR HYDRAULIC SYSTEM MAINTENANCE ACTION HAS BEEN PERFORMED THAT
REQUIRED A SIGNIFICANT REPLACEMENT OR EXCHANGE OF FLUID:
Perform a hydraulic fluid contamination check (Task 7-8.1).
42.1.
6, 7, 8
WHENEVER A MAJOR HYDRAULIC COMPONENT (FOR EXAMPLE: THE PUMP, CHECK VALVE, ETC.)
HAS FAILED, OR WHENEVER THE HYDRAULIC SYSTEM IS SUSPECT OF A FAULT, A SPECIAL
HYDRAULIC FLUID SAMPLE MUST BE TAKEN.
42.2.
6, 7, 8
WHENEVER ANY HYDRAULIC FLUID FILTER ELEMENTS ARE REMOVED FROM THE AIRCRAFT
DURING PHASE INSPECTION OR FOR NORMAL MAINTENANCE REPLACEMENT, SEND ELEMENTS
TO THE UNITS DESIGNATED AOAP LABORATORY FOR ANALYSIS.
43.
6, 7,
8, 10
WHEN A TRANSMISSION LUBRICATION SYSTEM HAS BEEN CONTAMINATED:
Perform an oil system contamination inspection (Tasks 6-112, 6-140, 6-170,
6-198).
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