TRANSMISSION (NAVY ONLY)

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

H-3

TRANSMISSION (NAVY ONLY)

JOAP ATOMIC EMISSION ROTRODE

Abnormal Trend

(PPM Increase

in 10 hrs)

Normal Range

0-33

0-4

0-10

0-5

0-16

0-13

Marginal Range

34-40

11-12

17-20

14-16

High Range

41-49

13-14

21-24

17-19

Abnormal

50+

15+

25+

20+

Average Concentration Other Elements:

Ni=1

Pb=3

Si=6

Sn=9

Ti=3

Mo=1

WATER LIMIT: 1,000 ppm on 0.100% (if equipment is available at lab)

Fe alone usually indicates discrepancy in spider gear reduction area. Cu wear metals associated with oil pump

bushing accessory drive wheel or main mast bushing bearing.

Water in the oil could cause high iron, copper, magnesium or aluminum due to corrosion. If high or abnormal wear

metals are obtained and high water is detected on two consecutive samples, the laboratory recommendation may

be to flush Main Transmission, reservice and perform serviceability check. Info CFA when recommending

flushing.

NOTE

Special samples may be recommended anytime unusual readings are obtained.

High metal readings without high water may result in a laboratory recommendation for flushing or removal of a

Main Transmission. A minimum of two consecutive high readings is required prior to recommending flushing or

removing a Main Transmission unless other evidence (chiplights, fragments, unusual noise, etc.) is found. Info

CFA when recommending flushing. CFA concurrence is required prior to recommendation for gearbox removal

due to high readings. Furnish CFA with 5 previous NOAP readings when recommending Main Transmission

Removal.

A127