TM 55-1520-240-23-5
6-137
AFT TRANSMISSION OIL SYSTEM ALLOWABLE LEAKAGE
6-137
INITIAL SETUP
Applicable Configurations:
All
Tools:
Flashlight
Workstand
Materials:
None
Personnel Required:
Medium Helicopter Repairer
Equipment Condition:
Battery Disconnected (Task 1-39)
Electrical Power Off
Helicopter On Level Surface
Right Baffle Under Aft Transmission Open (Task 1-2)
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 judgment
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
for 30 minutes or more, perform
a 5 minute ground run (TM
55-1520-240-10).
1.
Check sight gage (1) to determine oil level. Oil
level shall be between the FULL and ADD OIL
lines after a 2 hour flight.
FOLLOW-ON MAINTENANCE:
Service aft transmission (Task 1-54).
Close baffle under aft transmission (Task 2-2).
END OF TASK
6-501
