# SDR AALA20171020002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2017
- Submitted: October 21, 2017
- Operation: Air carrier
- Aircraft: [N818NN](https://openairdocs.org/aircraft/N818NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 30910
- Aircraft time: 25,072 hours, 9,889 cycles
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Indicator
- Part number: 2061151
- Condition: Unreliable
- Location: Cockpit
- Stage of operation: DE
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20171020002

## Discrepancy

AIRCRAFT WAS GROUNDED.  EMERGENCY DECLARED.  DURING DESCENT, LEFT FLAP NEEDLE ON FLAP POSITION INDICATOR BEGAN TO MIGRATE AWAY FROM THE UP POSITION CREATING A L/R NEEDLE SPLIT.  UNEVENTFUL LANDING WITH TRAILING EDGE FLAPS UP.  REMOVED AND REPLACED FLAP POSITION INDICATOR PER AMM 27-58-02 AND FLAP/SLAT ELECTRONICS UNIT PER AMM 27-51-01 (AALA201710209018) .  OPERATIONAL CHECK GOOD.

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