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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)
Ag
&
Cu Mg Zn
Contaminated with 10W30 automotive oil
Zn
Mo
Contaminated with automotive oil
Si
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

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