# SDR AALA202003309003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 29, 2020
- Submitted: March 30, 2020
- Operation: Air carrier
- Aircraft: [N994AN](https://openairdocs.org/aircraft/N994AN), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7407
- Aircraft time: 11,176 hours, 4,260 cycles
- System (JASC): [4980 · APU Exhaust System](https://openairdocs.org/jasc/4980)
- Part: Tube
- Condition: Blocked
- Location: Apu Vent
- Stage of operation: TX
- How discovered: O
- Nature of condition: A, B, P
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202003309003

## Discrepancy

AIRCRAFT NOT GROUNDED: AFTER ENGINE START SFO UPON APU SHUTDOWN ANOTHER FLIGHT CREW REPORTED FLAMES /SMOKE COMING  FROM APU EXHAUST, ARFF RESPONDED RETURNED TO GATE NO COCKPIT INDICATIOS OF APU FIRE OR ECAM  INDICATIONS OF MALFUNCTION.  TROUBLESHOT PER TSM 49-00-81. FOUND APU GEARBOX VENT TUBE BLOCKED. CLEANED VENT TUBE AND FITTING IAW AMM 49-26-55.

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