# SDR DALA2026031001657

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 7, 2026
- Submitted: March 10, 2026
- Operation: Air carrier
- Aircraft: [N955DZ](https://openairdocs.org/aircraft/N955DZ), registered now
- Make and model: Boeing 737-9GPER
- Registry model: [Boeing 737-9GPER](https://openairdocs.org/model/boeing-737-9gper) (OpenAirDocs)
- Aircraft serial: 38743
- Aircraft time: 29,599 hours, 16,843 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Oil System
- Condition: Leaking
- Location: Apu
- Stage of operation: NR
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2026031001657

## Discrepancy

(LOG 8395700) WHILE AT THE GATE JUST PRIOR TO PUSH FLIGHT ATTENDANTS REPORTED A KNOCKING SOUND IN AFT GALLEY. NOISE AND VIBRATION COULD ALSO BE FELT IN THE COCKPIT. THERE WAS ALSO A SLIGHT ODOR OF EXHAUST. VERIFIED APU AT FAULT, MCD FULL OF METAL. VERIFIED NO OIL CONTAMINATION IN BLEED DUCT.  PERFORMED DUCT BURN AND RECIRCULATION FILTER REPLACEMENT AS PRECAUTION. ALL NO GO ODI PROCEDURES C/W.

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