# SDR SWAA2021080299113

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2021
- Submitted: August 2, 2021
- Operation: Air carrier
- Aircraft: [N7729A](https://openairdocs.org/aircraft/N7729A), registered now
- Make and model: Boeing 737-76N
- Registry model: [Boeing 737-76N](https://openairdocs.org/model/boeing-737-76n) (OpenAirDocs)
- Aircraft serial: 32675
- Aircraft time: 48,728 hours, 24,344 cycles
- Engine: Cfmint CFM567B242
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Failed
- Location: Nr 1
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021080299113

## Discrepancy

AT FL380 WHILE AT CRUISE POWER; APPROX ONE HOUR INTO FLIGHT; WE FELT A SHUDDER THROUGHOUT THE AIRFRAME; LOOKED AT THE #1 ENGINE INSTRUMENTS AND SAW EGT APPROACHING LIMIT; RPM ROLLING BACK. NO INDICATION OF FIRE OR LOW OIL PRESSURE. PULLED THRUST LEVER TO IDLE; INDICATION BECAME NORMAL. DESCENDED RAPIDLY INTO KGSP WHILE RUNNING THE ENGINE STALL CHECK LIST. WHEN THRUST LEVER INCREASED TO >50-55%; VIBRATION WOULD RETURN. LANDED WITH #1 AT IDLE AND NO REVERSE THRUST USED ON LANDING. / [01] #1 ENGINE UNSCHEDULED CHANGE REF; TT68Q005ZAZ8 FOR RIGHT. REF TTQ005ZBOM FOR REMOVAL AND INSTALLATION DOCUMENTATION S/N 891284 REMOVED MAN CFM56-7B24. S/N 891284 INSTALLED MAN CFM56-7B24. C/W ENGINE RUNS IAN MT 771-0001 NO DEFECTS NOTED.

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