# SDR USAA2013011000026

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 7, 2013
- Submitted: January 10, 2013
- Operation: Air carrier
- Aircraft: [N172US](https://openairdocs.org/aircraft/N172US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1472
- Aircraft time: 40,968 hours, 14,819 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fuel Control
- Part number: 4419215
- Part serial: CUC14662
- Condition: Malfunctioned
- Location: Apu
- Part time: 11,673 hours, 4,396 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: A, B
- Precautionary procedure: F
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2013011000026

## Discrepancy

GROUND PERSONNEL REPORTED SMOKE AND FLAMES COMING FROM APU AFTER SHUTDOWN USING MASTER SWITCH.  FLAMES WOULD NOT SUBSIDE - APU FIRE BUTTON WAS PUSHED - FLAMES EXTINGUISHED.  MAINTENANCE REPLACED AIR/OIL SEPARATOR ADAPTER IAW AIRBUS MAINTENANCE MANUAL 49-26-54.  PER TECHNICAL SERVICE INSTRUCTION (TSI), THE APU FUEL CONTROL UNIT WAS ALSO REPLACED IAW AMM 49-32-11.

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