# SDR CALA2021041600469

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 14, 2021
- Submitted: April 16, 2021
- Operation: Air carrier
- Aircraft: [N27901](https://openairdocs.org/aircraft/N27901), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34821
- Aircraft time: 32,520 hours, 3,994 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: 100260201
- Condition: Faulted
- Location: Emergency Lights
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2021041600469

## Discrepancy

FOUND CMCF EXISTING FAULT MESSAGE APPEARED 33-12120; 33-12129 - REF HAECO NON-ROUTINE NO.9435766,  EA 4400-01109 REV.A OP001.  THE NO.20 WBU REP LACED AND PERFORMED INSTALLATION TEST. THE RESULT FOUND NORMAL. THE CMCF FAULT MESSAGE DISAPPEARED REFER AMM 33-51-07-02B-520A/7 20A REV.146.

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