TAIL ROTOR GEARBOX - TM-38-301-30188

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, MH-60S, MH-60R

TAIL ROTOR GEARBOX

JOAP ATOMIC EMISSION ROTRODE

Abnormal Trend

See

(PPM Increase

Note 1

in 10 hrs)

Normal Range

0-36

0-2

0-26

0-4

0-75

See

Marginal Range

37-41

27-32

Note 1

See

High Range

42-45

33-40

Note 1

See

Abnormal

46+

41+

Note 1

Average Concentration Other Elements:

Si < 100 ppm

WATER LIMIT: 1,200 ppm or 0.120%

NOTE 1:

For copper (Cu) wear concentrations, see the following paragraph on copper

The tail rotor gearbox has a self-contained splash lube oil system without an oil filter. Normal wear particles

and/or corrosion particles will continue to increase until the gearbox is drained and reserviced in accordance with

aircraft information manual.

All oil samples shall be checked for water content. Water Limit: 1200 ppm or 0.120 percent. Water content that

exceeds 1500 PPM shall result in a laboratory recommendation of "J": change oil; sample after first flight. Water

content between 1200 and 1500 PPM shall result in a laboratory recommendation "C": do not change oil;

resample after first flight. If resample results in water content still above 1200 PPM, laboratory recommendation

shall be "J": change oil; sample after first flight. Water in the oil can lead to corrosion which will cause iron and/or

magnesium wear metals to appear in the oil analysis. Water in the oil can also lead to the formation and

accumulation of sludge/deposits in the low areas of the gearbox, resulting from a breakdown of the oil. If sludge or

deposits are suspected to contaminate the oil, then remove the tail rotor servo and inspect for sludge deposit

accumulation in the gearbox and the I.D. of the pinion. Remove any accumulation with a clean dry low lint cloth.

The following supplementary information describes sources of individual wear metals and recommended

maintenance actions depending on contamination level and trend. Contact MMHISST.1 at the Naval Air Depot,

Cherry Point, NC for further information or clarification.

NOTE

Recommendation for immediate maintenance before further flight have serious impact

and are to be issued only in accordance with the instructions below. Any

recommendations involving immediate maintenance before further flight shall be

accompanied by a priority Naval message to NAVAVNDEPOT Cherry Point, NC citing

bureau number, operating activity, gearbox type, serial number, NOAP history, and

recommendation.

Fe -

If accompanied by copper, see the supplementary information for copper.

By itself, iron may indicate wear or corrosion of the pinion gear, bevel gear,

bearings, or liners. If iron level enters the marginal or high range without

accompanying copper, the recommendation shall be "Submit oil samples

approximately each 10 flight hours for the next 30 flight hours. Do not

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

A166