# SDR CALA2011102800692

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2011
- Submitted: October 28, 2011
- Operation: Air carrier
- Aircraft: [N57111](https://openairdocs.org/aircraft/N57111), registered now
- Make and model: Boeing 757224
- Aircraft serial: 27301
- Aircraft time: 71,073 hours, 15,522 cycles
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Pcu
- Part number: 734285E
- Part serial: 2250
- Condition: Malfunctioned
- Location: E&E Bay
- Part time: 39,802 hours, 7,941 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2011102800692

## Discrepancy

WHEN IN TURBULENCE, UTILITY BUS DROPS OFF LINE AND THEN BACK ON MOMENTARILY.  FLIGHT ATTENDANTS COMPLAIN OF OVENS, LIGHTS AND VIDEO SYSTEM GO OFF/ON AS WELL, MASTER CAUTION (L UTIL BUS) (R UTIL BUS) OVERHEAD UTILITY BUS LIGHT ON & R REC LIGHT (CONTINUOUS DURING TURBULENCE).  T/S PER WDM 24-51-15 AND FIM TASK 24-51-00-815-802 REMOVED AND REPLACED K10109 AND REMOVED AND REPLACED BUS POWER CONTROL UNIT.  LEFT AND RIGHT UTILITY BUSSES CHECK NORMAL NO FAULTS NOTED.  ROTABLE PARTS CHANGE WAS INDICATED - TT # 1458101  SN OFF 02250 CONTROL, BUS PO OFF 99-2441-9-0001 2250 ON 99-2441-9-0001 2315.

---
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.