# SDR MZZA97186

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 25, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N79743
- Make and model: Boeing 727224
- Aircraft serial: 22252
- System (JASC): [7930 · Engine Oil Indicating System](https://openairdocs.org/jasc/7930)
- Part: Switch
- Part number: 1032698
- Condition: Failed
- Location: Nr 3 Eng Bypass
- Stage of operation: CR
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MZZA97186

## Discrepancy

FLT 933 - GUM - NR 3 ENGINE OIL FILTER BYPASS LIGHT ILLUMINATED DURING CRUISE FLT AT FL 31.  ALL ENGINES PARAMETERS WERE NORMAL.  MX T/S SYSTEM AND REPLACED OIL FILTER AND O-RINGS, LIGHT REMAIN ON.  CHECK OIL LINE AND VENT LINE FOUND NORMAL.  REMOVED AND REPLACED BYPASS SWITCH PER MM 79-33-2.  ENGINE RAN FOUND NO LEAKS OIL FILTER OR BYPASS SWITCH PER MM 79-33-2.  ENGINE RAN FOUND NO LEAKS OIL FILTER OR BYPASS SWITCH.  LIGHT OPERATES NORMAL AND OPERATIONAL CHECK GOOD.  AIRCRAFT RELEASE FOR SERVICE.  (M)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.