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NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
SH-60B, SH-60F, HH-60H, UH-60L (Cont)
EH-60A, MH-60L, MH-60K, MH-60S, MH-60R AND VH-60N
INTERMEDIATE GEARBOX
range or if abnormal upward trend occurs, recommendation shall be to
"Discontinue flight operations and check for proper torque on the input and
output flange nuts in accordance with transmission system maintenance
manual". If proper torque is confirmed, recommendation shall be to "Change
oil and submit oil sample after initial turnup and approximately each 10 flight
hour period, return to normal sampling". If aluminum level returns to high or
abnormal range, or if abnormal upward trend recurs at any time within this 30
flight hour period, recommendation shall be to immediately discontinue
further flight operations, remove input and output flange and inspect flange
splines  for  fretting/wear  in  accordance  with  transmission  system
maintenance manual.
Mg
-
With a new or freshly reworked gearbox, magnesium usually indicates minor
manufacturing/assembly debris from housings. Otherwise, magnesium
contamination indicates internal corrosion or abrasive wear. Magnesium
components in the intermediate gearbox include the input housing, center
housing, output housing, and the lubrication spiral which provides oil to the
output bearing on the output bevel gear. Due to moisture accumulation,
vulnerability to corrosion is increased if intermediate gearbox has been
serviced but has not been operational for an extended period. If corrosion
occurs  due  to  moisture  contamination,  magnesium  is  sometimes
accompanied by iron. If magnesium level enters marginal or high range,
recommendation shall be to "Sample at approximately 10 flight hours interval
for next 30 flight hours. Do not change oil at this time. If magnesium level
does not increase to abnormal range and no abnormal upward trend occurs
in this initial 30 flight hour period, return to normal sampling". Maintain
normal sampling interval thereafter until abnormal level or abnormal upward
trend occurs. Due to relative softness of magnesium alloys in this gearbox,
risk of abrasion is not sufficient to justify oil change unless abnormal upward
trend occurs or magnesium level enters abnormal range. If magnesium level
enters abnormal range or if abnormal upward trend occurs, recommendation
shall be to "change oil, submit turn-up sample, and submit samples
approximately 10 flight hours for next 30 flight hours. If magnesium level
remains below marginal level and no abnormal upward trend occurs within
this 30 flight hour period, return to normal sampling." If magnesium level
returns to marginal range or above, or if abnormal upward trend occurs,
recommendation shall be to "Submit oil samples approximately each 10 flight
hours until intermediate gearbox can be removed due to internal
corrosion/wear".
A-163

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