# SDR UALA2011121406840

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2011
- Submitted: January 13, 2012
- Operation: Air carrier
- Aircraft: [N210UA](https://openairdocs.org/aircraft/N210UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30216
- Aircraft time: 42,265 hours, 9,251 cycles
- Engine: Pwa PW4077
- System (JASC): [2430 · DC Generating System](https://openairdocs.org/jasc/2430)
- Part: Relay
- Condition: Faulty
- Location: Dc Power System
- 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/UALA2011121406840

## Discrepancy

DC POWER WILL NOT ENERGIZE WHEN BATTERY SWITCH PUSHED IN.  RELAY K24006 & K24025 REPLACED AT P310 POWER MANAGEMENT PANEL, NO HELP. NOTE, GROUND POWER ENERGIZED & BATTERY SWITCH ON, DC POWER ENERGIZED, DE-ENERGIZED GROUND POWER , DC POWER STAY ON. BATTERY SWITCH OFF, DC POWER DE-ENERGIZED & PUSH BATTERY SWITCH ON, NO DC POWER. NO APU FIRE TEST OR UNABLE TO START APU. REPLACED DIODE BLOCK TB404 18F,D,B REF WDM 24-09-26.  ACCOMPLISHED MAIN BATTERY TEST REF MM 24-31-01 AND STANDBY SYSTEM TEST, ALL NORMAL.

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