# SDR U2RA2023052700023

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 27, 2023
- Submitted: May 28, 2023
- Operation: Air carrier
- Aircraft: [N729CA](https://openairdocs.org/aircraft/N729CA), registered now
- Make and model: Boeing 747412
- Aircraft serial: 25068
- Aircraft time: 92,086 hours, 15,924 cycles
- Engine: Pwa PW4056
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Bulb
- Part number: 1317
- Condition: Inoperative
- Location: U/D Ceiling St 5
- Component: Light Assy
- Component part number: 0105924001
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/U2RA2023052700023

## Discrepancy

DURING SCHEDULED A-CHECK MAINTENANCE, OPERATIONAL CHECK OF THE EMERGENCY EXIT LIGHT SYSTEM RESULTED IN FINDING OF INOPERATIVE LIGHT BULB.   LIGHT BULB REPLACED IAW AMM 33-51-07 REV. 107, SATIS

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