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Excessive vibration; apparently from one or both of the engines; resulted in a diversion for maintenance and an aircraft swap for an A319; its crew and passengers.
| Attributes | |
| ACN | 952101 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Turbine Engine |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Level at FL380; and cruising at .76 mach; we both noticed unusually high amount of vibration. I called up the flight control ECAM page to observe if any flight control flutter would be noted; there was none. The engine page was called up to note the N1 or N2 vibration amount. Levels were about .8 left and .6 right at about 85% to 86% N1. I then slowed the speed to M.74 to get some readings at a lower engine speed. The left was about 1.2; right .8 units at 82% to 83% N1 and you could feel the vibration in your seats; the glare shield and the thrust levers. I decided to ACARS the data to dispatch. In a few minutes; they sent back 2 messages. The first said that they were considering a diversion and the second said for us to divert.we did not declare an emergency. We asked for and received clearance to a divert airport without priority handling; as there was not any other engine problems or failures. The passengers and flight attendants were advised of the situation and an expected normal landing. We proceeded to the divert airport; landed normally; proceeded to the gate. After a meeting with maintenance personnel; the logbook entry was made denoting the problems. We deplaned; swapped aircraft and proceeded to our original destination; arriving about 2 hours late.
Original NASA ASRS Text
Title: Excessive vibration; apparently from one or both of the engines; resulted in a diversion for maintenance and an aircraft swap for an A319; its crew and passengers.
Narrative: Level at FL380; and cruising at .76 Mach; we both noticed unusually high amount of vibration. I called up the flight control ECAM page to observe if any flight control flutter would be noted; there was none. The engine page was called up to note the N1 or N2 vibration amount. Levels were about .8 left and .6 right at about 85% to 86% N1. I then slowed the speed to M.74 to get some readings at a lower engine speed. The left was about 1.2; right .8 units at 82% to 83% N1 and you could feel the vibration in your seats; the glare shield and the thrust levers. I decided to ACARS the data to Dispatch. In a few minutes; they sent back 2 messages. The first said that they were considering a diversion and the second said for us to divert.We did not declare an emergency. We asked for and received clearance to a divert airport without priority handling; as there was not any other engine problems or failures. The passengers and flight attendants were advised of the situation and an expected normal landing. We proceeded to the divert airport; landed normally; proceeded to the gate. After a meeting with Maintenance personnel; the logbook entry was made denoting the problems. We deplaned; swapped aircraft and proceeded to our original destination; arriving about 2 hours late.
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.