# SDR AALA202608311125

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 29, 2026
- Submitted: September 1, 2026
- Operation: Air carrier
- Aircraft: [N926NN](https://openairdocs.org/aircraft/N926NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33321
- Aircraft time: 39,494 hours, 17,246 cycles
- System (JASC): [5753 · Trailing Edge Flaps](https://openairdocs.org/jasc/5753)
- Part: Flap Track
- Condition: Excess Play
- Location: Zone 600 Flap
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202608311125

## Discrepancy

AIRCRAFT GROUNDED: HIGH FREQ VIBRATION FELT AFTER BEING AT CRUISE AT 39,000 FT FOR 5 MINS.  SIMILAR TO A CELL PHONE VIBE. 0 HZ.  COULD FEEL IN SEAT & FLOOR,  AFT GALLEY COULD HEAR & FEEL IT.   DESCENDED TO 35,000 FT. VIBE SLOWLY DECREASED IN INTENSITY AFTER BEING STABLE FOR 5 MINS,  SEEMINGLY UNAFFECTED BY PX CHANGE & REMAINED AT ABOUT 80% OF ORIGINAL INTENSITY. SPEEDS VARIED BTWN 235-260 KTS. SEEMED UNAFFECTED BY ENGINE N1 OR AIRSPEED.  AFTER ABOUT 15 MINS, DROPPED TO ABOUT 10% OF INTENSITY. AS A PRECAUTION, ARFF DISPATCHED. LANDED WITHOUT INCIDENT. MAINT FOUND RT WING MIDDLE FLAP TRACK FAIRING HAD EXCESSIVE PLAY & REPLACED BUSHINGS & HARDWARE IN RT WING MIDDLE FLAP TRAP FAIRING AS REQUIRED IAW AMM 27-51-18.

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