RECOMMENDATIONS, DIRECTIONS AND REQUIREMENTS

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

ENGINE:

F118-GE-101 (Cont)

AIRCRAFT:

(U2S)

Cu Mg

Contaminated with 10W30 automotive oil

RECOMMENDATIONS, DIRECTIONS AND REQUIREMENTS

1. Historically, high or abnormal wear metal levels have been tracked to engine accessory item failures. Main

engine bearing failures are typically caused by spalling, which is detected by chip detectors. Bearing failures may

occur without any indication reflected in the JOAP analysis. Chip detector inspection results and JOAP analysis

results may be used together to increase the accuracy of the evaluation process.

2. Chip detectors shall be inspected when increases in the JOAP wear metal concentrations cause concern or

when the OAP lab requests a special sample. Debris on the chip detector may indicate part distress.

3. When an engine has a wear metal concentration in the high range, or a trend approaching the abnormal limit,

the engine shall be placed on surveillance with T.O. U-2S-2-4.

4. If an engine has been disassembled for inspection due to wear metal concentration limits being exceeded,

that engine shall be placed on surveillance in accordance with T.O. U-2S-2-4.

5. Any wear metal concentration which requires the engine to be placed on surveillance or requires engine

maintenance shall be confirmed by analyzing a second sample taken from the suspect engine. The base engine

manager shall be notified of any special sample requests and engine surveillance code changes.

6. When an engine is on surveillance, oil filter and chip detector inspections shall be accomplished by the

appropriate personnel each time an oil sample is taken. Results will be reported to the OAP laboratory and base

engine manager. Again, JOAP analysis and chip detector inspection results shall be used together to effectively

evaluate the condition of the engine.

7. When an engine is on surveillance, oil samples shall be drawn after each flight and analysis results shall be

known before the next flight. All flying is restricted to the local area.

8. An engine on surveillance may be operated for maintenance or test cell operations as long as samples are

taken and analyzed and results received at intervals not to exceed one hour engine operating time. Under no

circumstances shall an engine be operated past the one hour time without having the sample results.

9. When an engine is on surveillance, any of the following require maintenance action to correct the problem(s):

a. If any wear metal concentration level moves into the higher range (i.e. marginal to high).

b. The wear metal trend continues to increase.

Chips are found on the chip detector.

d. When a wear metal concentration level is in the abnormal category.

e. When element(s) exceed the abnormal trend limit.

10. Engines with less than 100 hours engine operating time since new may typically increase into the marginal or

high range for Fe due to initial break-in of seals, etc. However, the Fe reading is not indicative of actual

component failure, effective JOAP analysis and chip detector inspections are essential. If all other wear metals

concentrations are normal, the Fe trend is normal and chip detector inspection is normal, then the engine may be

returned to normal surveillance.

11. F118-GE-101 engine maximum allowable consumption is 0.10 gallons per hour. Consumption inspection is

recommended at every servicing (calculated). If maximum consumption rate is exceeded, troubleshoot per

applicable technical order U-2S-2-4.

A95