# SDR HNAA2020121400361

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2020
- Submitted: December 14, 2020
- Operation: Air carrier
- Aircraft: [N638AE](https://openairdocs.org/aircraft/N638AE), registered now
- Make and model: Emb EMB-145LR
- Registry model: [EMB EMB-145LR](https://openairdocs.org/model/embraer-emb-145lr) (OpenAirDocs)
- Aircraft serial: 145172
- Aircraft time: 47,154 hours, 43,716 cycles
- System (JASC): [4997 · APU System Wiring](https://openairdocs.org/jasc/4997)
- Part: Contactor
- Condition: Burned
- Location: Apu Line
- Stage of operation: TX
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HNAA2020121400361

## Discrepancy

PDIS 638 49-10 2346991 13DEC20 MDT CLOSE.  WHEN PILOT TURNED ON HIS APU HE HAD SHED BUS 1 AND 2 OFF LINE FOLLOWED BY APU GEN OFF BUSS AND ELECTRICAL BURNING SMELL.  FACT 13DEC20 23:10 MDT.  APU LINE CONTACTOR SHOWS SIGNS OF BURN DAMAGE.  R & R APU LINE CONTACTOR, REF AMM 24-34-03.  RAN APU FOR 30 MIN.  OPERATIONS CHECK GOOD, NO ELECTRICAL SMELLS AT THIS TIME.  OK FOR SERVICE.

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