# SDR 2007UALA02002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 13, 2007
- Submitted: June 15, 2007
- Operation: Air carrier
- Aircraft: [N107UA](https://openairdocs.org/aircraft/N107UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 26900
- Aircraft time: 36,144 hours, 4,499 cycles
- Engine: Pwa PW4056
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Compressor
- Condition: Stalled
- Location: Nr 2 Engine
- Stage of operation: TO
- How discovered: O
- Nature of condition: R, A
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA02002

## Discrepancy

ABORTED TAKEOFF DUE TO NR 2 ENGINE COMPRESSOR STALL.    [08-08-07]   ACFT NR 3 ENG FERRIED TO SFO FOR ENGINE CHANGE.  ENGINE REPLACED AT SFO ON 06/15/07.  SHOP TEARDOWN FOUND ONE 6TH STAGE VSV VANE ARM BROKEN OFF AT THE "CLAW" TO THE ARM RADIUS AT THE 6:00 POSITION.  THE ADJACENT ARM WAS CRACKED 50% ACROSS.  THE DISCONNECTED VANE RESULTED IN A VIBRATORY SOURCE THAT EXCITED, AND INDUCED A FATIGUE FRACTURE IN, ONE 7TH STAGE BLADE AT ITS ROOT ATTACHMENT.  THIS BLADE LIBERATED, RESULTING IN HEAVY LEADING AND TRAILING EDGE DAMAGE TO THE 7TH THROUGH 15TH STAGE BLADE AIRFOILS.

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