# SDR IPXA2020122663810

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 26, 2020
- Submitted: January 5, 2021
- Operation: Air carrier
- Aircraft: [N281UP](https://openairdocs.org/aircraft/N281UP), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48538
- Aircraft time: 68,999 hours, 15,458 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Control Switch
- Condition: Failed
- 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/IPXA2020122663810

## Discrepancy

INSPECTION TYPE: N/A, SUPPLEMENTAL SDR, EMERGENCY LIGHTS WILL NOT ILLUMINATE.  DEFERRED EMERGENCY LIGHT SYSTEM, IAW MEL 33-50-4.  REPLACED BATTERY SUPPLY FOR T/S PURPOSES, NO HELP, SUSPECT FAULTY SWITCH.  PLACARD INSTALLED.  DMP C/W.   REPLACED RELAY R2-5700 EMERGENCY LIGHTS BATT PACK TEST AND REPLACED S1-346 EMERGENCY LIGHTS CONTROL SWITCH, IAW WDM 33-51-01.  OPERATIONS CHECK OK, IAW AMM 33-50-00.  REVERSED DMP.  IPC: 33-51-05-01.

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