TM 55-1520-240-23-1
1-92
INSPECTION
(Continued)
1-92
REF.
NO.
AREA
NO.
FREQUENCY
INSPECTION REQUIREMENTS
44.
6, 7,
8, 10
WHEN A TRANSMISSION OR AFT ROTARY WING SHAFT IS INACTIVE FOR 30 DAYS, OR
TRANSMISSION OIL COOLER IS REPLACED OR INACTIVE FOR 30 DAYS:
a. Perform a 30 minute ground run at normal rotor rpm.
b. After ground run and prior to first flight, inspect applicable filter(s) for
extended indicator buttons.
c. After first flight, inspect applicable filter(s) for extended indicator buttons.
44.1
6, 7,
8, 10
WHEN A TRANSMISSION OR AFT ROTARY WING SHAFT IS REPLACED (DOES NOT INCLUDE
CONTROLLED EXCHANGE):
a. Perform a 30 minute ground run at normal rotor rpm.
b. After ground run and prior to first flight, remove and inspect applicable
filter(s) and debris screens for contamination (Tasks 6-123, 6-129, 6-133,
6-148, 6-154, 6-157, 6-160, 6-163, 6-164, 6-171, 6-173, 6-174, 6-175, 6-199,
6-201, 6-202 as applicable).
c. After first flight, inspect applicable filter(s) for extended indicator button.
45.
6, 7,
8, 10
WHEN CONTAMINATION IS FOUND ON A TRANSMISSION OR AFT ROTARY WING DRIVE SHAFT,
CHIP DETECTOR, DEBRIS DETECTION SCREEN, MAIN INLET SCREEN, OR AUXILIARY OIL FILTER:
Check the quantity, source, form, and type of material. Determine serviceability
or necessity for replacement of component (Tasks 6-108, 6-136, 6-166, and
6-194).
46.
6
WHEN AN AFT TRANSMISSION HAS BEEN REPLACED DUE TO METAL CONTAMINATION:
Remove, inspect, and clean aft rotary wing drive shaft filter and chip detector.
If the chip detector is contaminated, replace the aft rotary wing drive shaft
(Tasks 6-56 or 6-57 and 6-62 or 6-63).
47.
6, 7,
8, 10
WHEN THE TRANSMISSION FILTER BYPASS BUTTON IS EXTENDED:
Replace filter element. Check in accordance with Tasks 6-108, 6-136, 6-166,
and 6-194.
48.
6, 7,
8, 10
WHEN AN ENGINE TRANSMISSION IS REMOVED:
Inspect the quill shaft nylon snubber (Task 6-101). If the snubber is cracked,
distorted, or disconnected, from the shaft shoulder, replace with new like item.
If the snubber is disintegrated, replace engine transmission (Task 6-107).
48.1.
6
PRIOR TO ENGINE TRANSMISSION BEING INSTALLED:
Conduct records check of the engine transmission DA Form 2408-16 to
determine the serial numbers of the input pinion spiral bevel gearshift
(145D6301) and spiral bevel gearshaft (145D6302) for prefix letter of "P" in
the serial number. Engine transmissions with this prefix letter "P" in the serial
number of these gear shafts are considered unserviceable.
49.
6
WHEN AN ENGINE TRANSMISSION HAS BEEN REMOVED BECAUSE OF A SUSPECTED INTERNAL
FAILURE AND THE OIL FILTER OR CHIP DETECTOR SHOW SIGNS OF METAL CONTAMINATION:
a. If filter shows signs of being bypassed or if the filter warning indicator is
extended, inspect inlet screen for contamination.
b. If inlet screen is contaminated, replace oil cooler and inlet screen and flush
hose between cooler and inlet screens. Perform serviceability check (Task
6-108).
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