# SDR COE2005F00004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2005
- Submitted: December 28, 2005
- Operation: Air carrier
- Aircraft: [N912FX](https://openairdocs.org/aircraft/N912FX), registered now
- Make and model: Aerosp ATR 42-300
- Registry model: [Aerosp ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300) (OpenAirDocs)
- Aircraft serial: 047
- Engine: Pwa PW120
- System (JASC): [2400 · Electrical Power System](https://openairdocs.org/jasc/2400)
- Part: Bpcu
- Part number: 111CC01A02
- Condition: Inoperative
- Part time: 14,962 hours
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COE2005F00004

## Discrepancy

AIR TURNBACK, PILOT REPORTED (CAC SOUNDED, ELEC CAP WARNING ILLUMINATED, ADI (CPL DATA INVALID) ANNUNCIATION ON T/O ROLL.  MAINTENANCE REPLACED EMER BATTERY CHARGER RELAY PROTECTION UNIT (BPU).  OPS CHECKED GOOD.  AIRCRAFT WAS RETURNED TO SERVICE.  (K)

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