# SDR UALA2011092705235

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 27, 2011
- Submitted: October 20, 2011
- Operation: Air carrier
- Aircraft: N177UA
- Make and model: Boeing 747422
- Aircraft serial: 24384
- Aircraft time: 88,181 hours, 10,784 cycles
- Engine: Pwa PW4056
- System (JASC): [2752 · Trailing Edge Flap Actuator](https://openairdocs.org/jasc/2752)
- Part: Pdu
- Part number: 60B8004237
- Part serial: 152
- Condition: Faulted
- Location: Flap Sys
- 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/UALA2011092705235

## Discrepancy

CREW REPORT FLAPS PRIMARY ON EXTENSION AND FLAPS CONTROL.  REPLACED NR 1 L/E PNEU DRIVE UNIT (PDU), REF MM.  OPS CHECKED GOOD BOTH PNEUMATICALLY & IN ALT FLAPS (ELECTRICALLY).

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