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A321 crew experienced a strong vibration approaching V1 during takeoff. After takeoff; left engine N1 vibration is found to be 7.5 units; and the decision is made to return to the departure airport for an overweight landing. During post flight inspection; a bird strike is detected in the left engine.
| Attributes | |
| ACN | 982972 |
| Time | |
| Date | 201112 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Make Model Name | A321 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Bird / Animal |
Narrative:
Just prior to V1 on takeoff a strong vibration began from aircraft left. Engine #1 (left) N1 vibration indicated approximately 5.0. Immediately after liftoff the vibration increased to approximately 7.5 N1. We climbed to 8;000 ft; stayed with departure control and evaluated the problem. The vibration was not intermittent and it increased and decreased relative to the engine #1 power setting. The decision was made to return. The dispatcher; maintenance; flight attendants and passengers were notified and; as a precaution; an emergency was declared. The engine was not shutdown in flight. An uneventful and smooth overweight landing was made and the emergency was then terminated with emergency personnel. The engine was inspected by the crew at the gate and there was evidence of a bird strike with resulting compressor vane damage on engine #1. Neither pilot saw any birds during the takeoff roll.
Original NASA ASRS Text
Title: A321 crew experienced a strong vibration approaching V1 during takeoff. After takeoff; left engine N1 vibration is found to be 7.5 units; and the decision is made to return to the departure airport for an overweight landing. During post flight inspection; a bird strike is detected in the left engine.
Narrative: Just prior to V1 on takeoff a strong vibration began from aircraft left. Engine #1 (left) N1 vibration indicated approximately 5.0. Immediately after liftoff the vibration increased to approximately 7.5 N1. We climbed to 8;000 FT; stayed with Departure Control and evaluated the problem. The vibration was not intermittent and it increased and decreased relative to the engine #1 power setting. The decision was made to return. The Dispatcher; Maintenance; Flight Attendants and passengers were notified and; as a precaution; an emergency was declared. The engine was not shutdown in flight. An uneventful and smooth overweight landing was made and the emergency was then terminated with emergency personnel. The engine was inspected by the crew at the gate and there was evidence of a bird strike with resulting compressor vane damage on engine #1. Neither pilot saw any birds during the takeoff roll.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.