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

Nickel is a component of steels used in gears, bearings, and sleeves in this

gearbox. It is also used as a base plating for the chrome layer used on the

input and output flange sleeves. Because plating applications are under

0.005-0.007 inch layer of chrome, wear on nickel plating would be preceded

by abnormal levels of chromium. More likely source of nickel is wear or

corrosion of a gear, bearing, or sleeve. Because steels will normally produce

iron in greater quantity, iron level is used for maintenance decisions on these

components (See supplementary information above on iron).

Silicon is not a critical wear metal in the intermediate gearbox, but should be

monitored due to the potential for abrasion if levels grow too high. The

probable source of silicon is contamination from sand. Oil change shall be

recommended for verified silicon level over 60 ppm.

Lead may appear, but does not impact operation of aircraft. Continue to

operate aircraft with no corrective action required.

A165