# SDR AALA20170127003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 26, 2017
- Submitted: January 30, 2017
- Operation: Air carrier
- Aircraft: [N873NN](https://openairdocs.org/aircraft/N873NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 40766
- Aircraft time: 17,256 hours, 6,912 cycles
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Sensor
- Condition: Malfunctioned
- Location: Te Flap
- Stage of operation: LD
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20170127003

## Discrepancy

AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. DURING LANDING, FLAPS WOULD NOT EXTEND FROM 5 TO 15 DEGREES. USED ALTERNATE PROCEDURE TO LOWER FLAPS TO 15 DEGREES. LANDING UNEVENTFUL. PERFORMED BITE CHECK OF FLAP/SLAT ELECTRONICS UNIT AND FOUND TRAILING EDGE FLAP SENSOR DISAGREE. INSPECTED TRAILING EDGE FLAP DRIVE SYSTEM AND RAN FLAPS SEVERAL CYCLES WITH NO FAULTS. OPERATIONAL CHECK GOOD IAW FIM 27-51-00-810-832.

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