# SDR CALA2015050793680

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 5, 2015
- Submitted: May 7, 2015
- Operation: Air carrier
- Aircraft: [N206UA](https://openairdocs.org/aircraft/N206UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30212
- Aircraft time: 69,594 hours, 9,643 cycles
- Engine: Pwa PW40903
- Engine time: 4,903 hours, 56,016 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Malfunctioned
- Stage of operation: UK
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2015050793680

## Discrepancy

SURGE OR STALL OF ENG DURING FWD THRUST.  FELT AIRFRAME SHUDDER, OBSERVED EPR & N1 DROP & RECOVER.  EPCS AUTO EVENT DATA SHOWS NO N1 OR N2 VIBE SHIFTS.  FLIGHT CREW ADVISES N1 ROLL BACK WAS 1 - 3% & EPR ROLLBACK 0.15.  FIM TASK 7 1-05 TASK 819 STEPS C12 & C13 CARRIED OUT, VISUALLY CHECK FOR METAL OR DAMAGE IN THE EXHAUST, FAN BLADES, FAN EXIT VANES, 2.5 & 2.9 BLEED VLVS.  NO DAMAGE OR DEBRIS FOUND, ALL LOOK NORMAL.

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