# SDR UALA2011050502195

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 4, 2011
- Submitted: May 27, 2011
- Operation: Air carrier
- Aircraft: [N785UA](https://openairdocs.org/aircraft/N785UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26954
- Aircraft time: 62,631 hours, 9,002 cycles
- Engine: Pwa PW40903
- System (JASC): [3320 · Passenger Compartment Lighting](https://openairdocs.org/jasc/3320)
- Part: Module
- Part number: 285W00271
- Part serial: 52
- Condition: Faulty
- Location: Cabin Lights
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011050502195

## Discrepancy

AFT CABIN LIGHTS STUCK IN BRIGHT MODE. SUSPECT ZMU 3 FAULT. RESET ZMU3 CB H4, NO HELP.  RESET CONNECTORS AT ZMU 3, NO HELP. OPEN AND COLLARED CBS AT P320 CABIN LIGHTS L07 AND G03. RPL ZMU3, NO HELP.CONFIRMED BAD ZMU 3 FROM STOCK.  REPLACED ZMU 3, OPS CHECKED NORMAL.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.