# SDR AALA202105279003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 25, 2021
- Submitted: May 27, 2021
- Operation: Air carrier
- Aircraft: [N879NN](https://openairdocs.org/aircraft/N879NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31133
- Aircraft time: 28,656 hours, 11,897 cycles
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Transmitter
- Condition: Faulted
- Location: Rt Wing
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202105279003

## Discrepancy

AIRCRAFT WAS GROUNDED: ON TAKE OFF ROLL, POWER WAS SET TO 40% N1 FOR ENGINE STABILIZATION, THEN ADVANCED TO TAKE OFF POWER. A MOMENT LATER, TAKE OFF CONFIGURATION WARNING SOUNDED AND TAKE OFF WAS ABORTED. ABORT WAS LOW SPEED. AFTER CLEARING RUNWAY, NOTED FLAP ASYMMETRY (LEFT FLAP WAS BELOW FLAPS 5 INDEX). ALSO, MACH TRIM FAIL LIGHT CAME ON AND MANAGEMENT COMPUTER AND FLIGHT CONTROL ANNUNCIATOR LIGHTS WERE ILLUMINATED. REMOVED AND REPLACED LEFT (AALA202105269012) AND RIGHT FLAP POSITION TRANSMITTERS PER AMM 27-58-01, ALL REQUIRED TESTS CHECK GOOD. ALSO REPLACED INTEGRATED FLIGHT SYSTEMS ACCESSORY UNIT (AALA202105279004) PER AMM 22-11-37.

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