TM 55-1520-240-23-5
6-182.1
INSPECT COMBINING TRANSMISSION FAN ASSEMBLY AND FAN DRIVE
SHAFT (Continued)
6-182.1
INSPECT DRIVE SHAFT HELICOPTER (WITHOUT
66 )
1.
Inspect splines (1) at each end of drive shaft (2)
for wear. If wear is evident, proceed as follows:
a.
Place a straightedge (6 inch metal ruler or
equivalent) along the length of the spline,
with the ruler spanning the worn area.
b.
Using a feeler gauge, measure the depth of
wear below the face of the spline.
c.
If upper spline wear exceeds 0.015 inch,
replace the drive shalt and fan assembly.
1.1.
Using 10X magnifying glass, visually inspect the
aluminum fan shaft tube for cracks extending
from under the steel adapters. No cracks
allowed.
CAUTION
Do not use tools to check for
looseness on the jo-bolts. Damage to
the shaft will result.
1.2.
Inspect jo-bolts that attach the adapters to the
fan shaft tube for looseness. Attempt to turn
the bolts by hand only. If any jo-bolts are loose,
replace fan shaft.
1.3.
Perform a check of the combining transmission
output gear spline wear using spline wear
(GO-NO-GO) gauge, P/N SK33330-018. Insert
the spline gauge into the output gear where the
cooling fan shaft normally fits. If the gauge does
not fit, transmission is serviceable. If the gauge
fits, (partially or completely), replace combining
transmission.
1.4.
Perform a check of the fan assembly input gear
spline wear using spline wear (GO-NO-GO)
gauge, P/N SK33330-018. Insert the spline
gauge into the input gear of the fan where the
cooling fan shaft normally fits. If the gauge does
not fit, cooling fan is serviceable. If the gauge
fits, (partially or completely), replace cooling fan.
Change 1
6-599
