INTERMEDIATE GEARBOX (Cont)

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

Titanium particles may be indicative of fretting/wear on the input and output

flange splines. Aluminum wear particles should accompany the titanium,

since there is aluminum in the titanium alloy for both flanges. If titanium level

enters marginal or high range, recommendation shall be to "Submit oil

samples approximately each 10 flight hours for the next 30 flight hours. Do

not change oil at this time. If titanium level does not increase to abnormal

range during this period, and no abnormal upward trend occurs, change oil at

the end of the 30 hour period to remove potentially abrasive titanium

particles, and return to normal sampling." If titanium level enters abnormal

range, or if abnormal upward trend in titanium occurs, recommendation shall

be to "Discontinue flight operations and check for proper torque on input and

output flange nuts in accordance with transmission system maintenance

manual". If proper torque is confirmed, recommendation shall be to "Change

oil, submit oil sample after initial turn-up, and submit oil sample

approximately each 10 flight hours for the next 30 flight hours. If titanium

level remains below marginal range and no abnormal upward trend occurs by

the end of this 30 flight hour period, return to normal sampling". If titanium

level returns to marginal range or above, or if abnormal upward trend in

titanium level recurs at any time within this 30 flight hour period,

recommendation shall be to "Immediately discontinue further flight

operations, remove input and output flanges and inspect flange splines and

bevel gear splines for fretting/wear in accordance with transmission system

maintenance manual".

Chromium in the intermediate gearbox indicates wear of input and/or output

flange sleeves from seal rubbing. Normal service wear on either sleeve is

benign and requires no maintenance action until leakage rate exceeds

allowable limits.

Cu -

Copper is an alternative to silver plating on the splines of the input pinion and

output bevel gears. If copper level enters marginal or high range,

recommendation shall be to "Submit oil samples approximately each 10 flight

hours for the next 30 flight hours. Do not change oil at this time. If copper

level does not increase to abnormal range and no abnormal upward trend

occurs within this period, change oil at the end of the 30 hour period and

return to normal sampling". If copper level enters abnormal range, or if

abnormal upward trend in copper occurs, recommendation shall be to

discontinue flight operations and check for proper torque on input and output

flange nuts in accordance with transmission system maintenance manual". If

proper torque is confirmed, recommendation shall be to "Change oil, submit

oil sample after initial turn-up, and submit oil sample approximately each 10

flight hours for the next 30 flight hours. If copper level remains below

marginal range and no abnormal upward trend occurs within this 30 flight

hour period, return to normal sampling". If copper level returns to marginal

range or above or if abnormal upward trend in copper level occurs within this

30 flight hour period, recommendation shall be to "Immediately discontinue

further flight operations, remove input and output flanges, and inspect flange

splines and gear splines for fretting/wear in accordance with transmission

system maintenance manual".

A-164