JOAP ATOMIC EMISSION ROTRODE (Cont)

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

ENGINE:

F101-GE-102 (Cont)

AIRCRAFT:

(B-1B)

Alternator stator housing

Alternator core laminations

Hydraulic pump torque motor servo valve

1. A sudden increase (9-11 ppm) of Fe may indicate main bearing distress; small amounts or Ag may

accompany the Fe.

A moderate increasing trend of Fe may indicate excessive wear of gears and gearshaft splines.

3. For a confirmed significant (8-9 ppm) Ti reading, the Nos 1, 2 and possible No. 3 bearing inner races may

be turning on the inner race journals.

4. Lube and scavenge pump bearing distress may be indicated by trends in Fe and Cu together. Al may

accompany the Fe and Cu.

5. Increasing trends in Fe may indicate gearbox problems. Mg and Ag wear metals may accompany the

increase in Fe.

6. Cr is used on Nos. 4 and 5 bearing journals and may be used for repair of gearbox bearing journals.

Increasing Cr may indicate inner race spinning on the journals.

7. Inspect chip detectors when increases in JOAP wear metals cause concern; debris in the chip detector may

indicate part distress.

8. The main engine bearings may fail without indication reflected in the JOAP analysis. Spalling of these

bearings is detected by chip detectors.

9. High Si indicates oil contamination, possibly from oil servicing cart, engine wash chemicals, or hydraulic

pump torque motor servo valve damping fluid. High Si content in oil sampled from the Hydraulic Pump with

Normal Range Si content in the oil sampled from the Lube and Scavenge Pump oil would indicate leakage of

the Hydraulic Pump Torque Motor Servo Valve damping solution, Hydraulic Pump replacement is

recommended. The oil-servicing cart should be checked for contamination and, if contamination is confirmed,

shall be drained and flushed. The engine shall be drained and flushed to remove Si contamination. Post

maintenance samples from the engine and oil-servicing cart, if applicable, shall be analyzed by the OAP

laboratory to assure all Si contamination has been removed.

10. Boost pump bearing distress may be indicated by trends in Cu and Zn together.

11. When high JOAP levels (e.g., Cu) are noted, an additional sample should be taken from the hydraulic tank

servicing tee to isolate the source to the lube or hydraulic components. When the hydraulic system is

generating the wear metals, the contaminate level will be significantly higher in the hydraulic oil sample.

12. Indications of Pb are not indicative of a need for further troubleshooting. Pb residue is a result of the tube

forming process.

13. Increases or abnormal levels in Zn or Mo, with no accompanying wear metals, is not cause for engine

removal. However, when these abnormal trends or levels occur, the oil cart should be checked for

contamination.

A77