# SDR AALA201905149023

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 11, 2019
- Submitted: May 14, 2019
- Operation: Air carrier
- Aircraft: [N979NN](https://openairdocs.org/aircraft/N979NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31228
- Aircraft time: 12,053 hours, 4,796 cycles
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Bellcrank
- Part number: 113A39135
- Condition: Worn
- Location: Te Flap
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201905149023

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT DECLARED EMERGENCY ON ACCOUNT OF UNKNOWN VIBRATION. MAINTENANCE ACCOMPLISHED AIRFRAME VIBRATION CONDITIONAL INSPECTIONS IAW AMM 05-51-67. MAINTENANCE FOUND THE RT FLAP OUTBOARD, INBOARD FLAP BELCRANK WORN. REMOVED AND REPLACED OUTBOARD AFT FLAP INBOARD BELLCRANK. RIG AND OPS CHECK GOOD IAW AMM 27-51-24. (SEE SDR# AALA201905139030).

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