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:

F110-GE-129 (Cont)

AIRCRAFT:

(F-16)

Cu Mg Zn

Contaminated with 10W30 automotive oil

Contaminated with automotive oil

Hydraulic pump torque motor servo valve

RECOMMENDATIONS, DIRECTIONS AND REQUIREMENTS

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

engine bearing failures on the F110 engine 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 for the F110

engine.

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

the OAP lab request a red cap sample. Debris on the chip detector may indicate part distress.

3. When high wear metal concentrations requiring maintenance action are noted, a sample shall be taken from

the hydraulic tank servicing port to isolate the wear metal source to either the lube oil or hydraulic components.

When the hydraulic system is generating the wear metal, the concentration level will be significantly higher in the

hydraulic oil sample. If a significant rise in Fe accompanies Ti, a loose No. 3 locknut may be indicated.

4. An engine shall be placed on surveillance when Table 2-2 decision making guidelines recommend any code

except "A" or "A or B" the engine shall remain on surveillance until either Table 2-2 recommendation drops to "A"

or "A or B", or troubleshooting and correction are required per step 10.

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

that engine shall be placed on surveillance for 10 EFH.

6. Any wear metal concentration which requires the engine 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 red cap requests and engine surveillance code changes.

7. When an engine is on surveillance, chip detector inspection shall be accomplished by the appropriate

personnel each time an oil sample is taken. Oil and hydraulic filters shall be inspected when first placed on

surveillance. Results will be reported to the OAP laboratory and base engine manager. JOAP analysis and chip

detector inspection results shall be used together to effectively evaluate the condition of the F110 engine.

8. When an F110 engine is on surveillance, oil samples shall be drawn after each flight and analysis results shall

be known before the next flight. Flying shall be restricted to the local area, only if Table 2-2 recommends

Code E or higher.

9. Engines under surveillance maybe operated for maintenance or test cell operation for up to 2 hours engine

operating time (EOT) before a sample must be taken, The engine may be operated for additional 2 hours EOT

before the results of the first and second samples must be known.

10. Troubleshooting and corrective maintenance actions to correct the source of wear metals must be taken when

Table 2-2 or OAP laboratory recommends code "H" or higher.

11. Engines with less than 100 flying hours since new may exhibit Fe trending and concentrations that exceed the

limits prescribed in the tables. This is due to initial break-in of oil lubricated parts and the cleaning action of the oil

which may remove microscopic manufacturing residues. For such engines, the following iron trending and

concentration limits apply, provided that all other wear metal concentrations, oil consumption and master chip

detector (MCD) inspections are normal/within limits.

A-86