# SDR USAA2011120800019

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2011
- Submitted: December 9, 2011
- Operation: Air carrier
- Aircraft: [N171US](https://openairdocs.org/aircraft/N171US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1465
- Aircraft time: 37,973 hours, 13,573 cycles
- Engine: Cfmint CFM565B3P
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Blade
- Part number: 3380021140
- Part serial: BB3374110
- Condition: Damaged
- Location: Nr 1 Engine
- Part time: 34,034 hours, 17,371 cycles
- Stage of operation: TO
- 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/USAA2011120800019

## Discrepancy

CREW REPORTED VIBRATION (AIRCRAFT LEFT) ON TAKEOFF ROLL.  THE NR 1 ENGINE N1 VIBRATION INDICATION WAS 5.0 JUST AFTER LIFT OFF.  VIBRATION INCREASED TO 7.5 N1 AMBIENT TEMP.  TEMP AT TAKEOFF WAS +14 C.  AN EMERGENCY WAS DECLARED AND AIRCRAFT RETURNED TO CLT.  POST FLIGHT INSPECTION OF NR 1 ENGINE INDICATED A BIRD STRIKE.  BLADES NR 35 AND NR 17 WERE REPLACED IAW AIRBUS MAINTENANCE MANUAL 72-21-00-300-020.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.