# SDR AALA20151129001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 29, 2015
- Submitted: December 3, 2015
- Operation: Air carrier
- Aircraft: [N760AN](https://openairdocs.org/aircraft/N760AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 31477
- Aircraft time: 56,519 hours, 7,052 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Carbon Seal
- Condition: Leaking
- Location: Apu
- Part time: 53,510 hours, 6,897 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20151129001

## Discrepancy

AT GATE WITH CREW ON BOARD & BEFORE PAX BOARDING, THE CABIN FILLED WITH SMOKE, WHICH MOVED INTO THE JET BRIDGE IN CONJUNCTION WITH A REDUCTION IN APU OIL QTY & FOLLOWED BY APU AUTO SHUTDOWN.  R & R APU IAW MCM WC 49-94-11.  OPERATIONAL & LEAK CHECKED GOOD.   APU ENGINEERING REPORTS OIL LEAK DUE TO ECS-EC CARBON SEAL FAILURE.

---
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.