# SDR AALA202503187136

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2025
- Submitted: March 18, 2025
- Operation: Air carrier
- Aircraft: [N922NN](https://openairdocs.org/aircraft/N922NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29574
- Aircraft time: 34,896 hours, 15,016 cycles
- Engine: Cfmint CFM567B242
- Engine time: 44,506 hours, 18,633 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Vibration
- Location: Nr 1
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, R, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202503187136

## Discrepancy

AIRCRAFT WAS GROUNDED: DURING APU TO PACK BLEED CONFIGURATION CHECK LEVEL AT 15000, ADJUSTING THRUST LEVERS CAUSED NUMBER 1 ENGINE TO HAVE SIGNIFICANT VISIBLE VIBRATION AS WELL AS COMPRESSOR STALL FELT IN FLIGHT DECK AND UNRESPONSIVENESS FROM LEFT ENGINE THRUST LEVER COMMANDS. GEAR WAS BEING TRANSITIONED BETWEEN DOWN AND UP DURING TWO OCCASIONS.  REMOVE AND REPLACED NUMBER 1 ENGINE. PER TASK CARD 08L40072003-E1**(CLOSED).

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