# SDR 2007UALA00676

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 6, 2007
- Submitted: March 13, 2007
- Operation: Air carrier
- Aircraft: [N524UA](https://openairdocs.org/aircraft/N524UA), registered now
- Make and model: Boeing 757222
- Aircraft serial: 24977
- Aircraft time: 54,271 hours, 20,070 cycles
- Engine: Pwa PW2037
- Engine time: 52,456 hours, 18,771 cycles
- System (JASC): [7160 · Engine Air Intake System](https://openairdocs.org/jasc/7160)
- Part: Duct
- Condition: Loose
- Location: Lt Engine
- Stage of operation: CL
- 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/2007UALA00676

## Discrepancy

RTFL DUE TO SIGNIFICANT VIBRATION IN LEFT ENGINE AFTER TAKEOFF.  COULD NOT ADVANCE POWER W/O VIBRATION INCREASING.  3RD STAGE LPT BLADE FRACTURED.   THE 3RD STAGE LPT BLADES AND VANES WERE SULFIDED.  DURING DISASSEMBLY A BOLT FOR THE OUTER DUCT WAS FOUND FRACTURED.  THE LOOSE DUCT REDUCED AIRFLOW TO THE BLADES AND THE ON-GOING BLADE SULFIDATION CAUSED THE FAILURE OF BLADE.

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