# SDR USAA20090410SB054

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 8, 2009
- Submitted: April 10, 2009
- Operation: Air carrier
- Aircraft: N157AW
- Make and model: Boeing 737-3G7
- Registry model: [Boeing 737-3G7](https://openairdocs.org/model/boeing-737-3g7) (OpenAirDocs)
- Aircraft serial: 23779
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Indicator
- Part number: 2061141
- Part serial: 1108
- Condition: Faulty
- Location: Cockpit
- Part time: 8,666 hours, 5,371 cycles
- Stage of operation: AP
- How discovered: O
- Nature of condition: O
- Precautionary procedure: L
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA20090410SB054

## Discrepancy

ON APPROACH TO DEN, CREW ENCOUNTERED A FLAP PROBLEM.  THERE WAS ALSO LOW LEVEL TURBULENCE REPORTED IN THE AREA WITH GUSTY SURFACE WINDS.  AT FIRST THE FLAPS WERE SLIGHTLY SPLIT AND STUCK IN THE FLAPS 1 POSITION.  CREW INITIATED A GO-AROUND.  AS CREW PROCEEDED TO LINE UP FOR ANOTHER APPROACH WITH ALMOST NO FLAPS, DECLARED AN EMERGENCY AND THE EQUIPMENT RESPONDED.  SHORTLY BEFORE TOUCHDOWN, THE FLAPS SUDDENLY STARTED WORKING CORRECTLY, MADE A NORMAL LANDING.  MAINTENANCE REMOVED AND REPLACED THE FLAP POSITION INDICATOR PER MM 27-58-01. OPERATIONAL CHECK GOOD. CHECKED X-DIMENSIONS AT ALL FLAP SETTINGS. ALL POSITIONS GOOD PER MM 27-51-00-5. ALSO, CHECKED/SERVICED FLAP POWER UNIT GEARBOXES AND ALTERNATE FLAP DRIVE U

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