# SDR USAAD00158

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 5, 2000
- Submitted: November 22, 2000
- Operation: Air carrier
- Aircraft: N822US
- Make and model: Doug DC-9-82
- Registry model: [Doug DC-9-82](https://openairdocs.org/model/mcdonnell-douglas-dc-9-82) (OpenAirDocs)
- Aircraft serial: 49139
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: GTCP8598DCB
- Condition: Seized
- Location: Aft Fuselage
- Stage of operation: TX
- How discovered: O
- Nature of condition: T
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAAD00158

## Discrepancy

ORD-PIT - FLT 1674 - WHILE BOARDING THE FLIGHT, A LOUD BANG WAS HEARD AT THE REAR OF THE AIRCRAFT.  AT THAT TIME, ALL APU POWER WAS LOST.  PASSENGERS ON BOARD WERE DEPLANED AND THE FLIGHT WAS CANCELLED.  MAINTENANCE FOUND THE APU, APU BOX, AND APU MOUNTING BRACKETS DAMAGED.  MAINTENANCE REPLACED THE APU ASSEMBLY.  (M)

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