TM 55-1520-240-23-5
6-109
FORWARD TRANSMISSION OIL SYSTEM ALLOWABLE LEAKAGE
6-109
INITIAL SETUP
Applicable Configurations:
All
Tools:
Flashlight
Materials:
None
Personnel Required:
Medium Helicopter Repairer
References:
TM 55-1520-240-10
Equipment Condition:
Battery Disconnected (Task 1-39)
Electrical Power Off
Helicopter on Level Surface
Prolonged oil leakage can damage
finish and create a work hazard
by making the fuselage slippery.
It can also affect other systems in
the helicopter. Therefore, good
judgement must be used when
determining allowable leakage.
The maximum allowable leakage rate,
static, or dynamic, from any oil seal
in the transmission is 20 drops (one
cubic centimeter) per hour. If this
limit is exceeded, the cause of the
leakage shall be corrected by repair
or replacement.
NOTE
If engines have not been operated
within the past 30 minutes, perform
a 5 minute ground run (TM
55-1520-240-10).
Check sight gage (1) from cockpit to determine oil level.
Oil level shall be between the FULL and ADD OIL lines
after a 2 hour flight.
FOLLOW-ON MAINTENANCE:
Service forward transmission, if needed (Task 1-54).
END OF TASK
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