# SDR CALA2023101103036

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 8, 2023
- Submitted: October 11, 2023
- Operation: Air carrier
- Aircraft: [N41140](https://openairdocs.org/aircraft/N41140), registered now
- Make and model: Boeing 757224
- Aircraft serial: 30353
- Aircraft time: 88,822 hours, 18,586 cycles
- Engine: Rroyce RB211535E4B3
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Unknown
- Location: Nr 1
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2023101103036

## Discrepancy

DEBRIEF OF FLIGHT CREW STATES THEY HEARD A LOUD BANG FROM NUMBER 1 ENG WITH AN UNCOMMANDED YAW TO A/C RIGHT AT 38000 FT. ALSO L ENG VIB INDICATION PEAKED AT 3.7. FORCING AN AIR RETURN TO EWR DUE CREW VIB CHECK LIST INSTRUCTION. L ENG BB VIB MSG DISPLAYED ON ECS PAGE. PERFORMED VISUAL INSPECTION OF NUMBER 1 ENG. PHOTOS ATTACHED. REF WORKCARD 19-7200-9-0001 FOR #1 ENGINE REPLACEMENT SCHEDULED PARTS CHANGE

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