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An A319 pilot reports vertical airframe vibration at FL280; mach .78; 328 KTS while descending. Vibration ceased with approximately 10 KT airspeed decrease.
| Attributes | |
| ACN | 700243 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zny.artcc |
| State Reference | NY |
| Altitude | msl single value : 28000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 90 flight time total : 11000 flight time type : 2900 |
| ASRS Report | 700243 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On descent from FL280; autoplt 2 engaged; .78 mach; 328 KTS; we got moderate airframe vibration. Felt in cockpit and aft cabin. First officer disconnected autoplt and deployed speed brake and slowed aircraft approximately 10 KTS. Vibration disappeared. Vibration was vertical versus lateral. No ECAM; flight controls normal. Aircraft flew normal arrival and landing; no injuries; no damage noted. Talked to line maintenance and submitted vibration report; logged write-up after discussion with maintenance. Maintenance inspected aircraft and found no initial abnormalities.callback conversation with reporter revealed the following information: reporter stated that at a lower altitude; they accelerated to a speed at which the vibration first occurred but could not induce it again. Following their maintenance write-up; the #1 elac (aileron elevator computer) was changed because of a maintenance notice and that the elevator was re-trimmed prior to the next flight.
Original NASA ASRS Text
Title: AN A319 PLT RPTS VERT AIRFRAME VIBRATION AT FL280; MACH .78; 328 KTS WHILE DSNDING. VIBRATION CEASED WITH APPROX 10 KT AIRSPD DECREASE.
Narrative: ON DSCNT FROM FL280; AUTOPLT 2 ENGAGED; .78 MACH; 328 KTS; WE GOT MODERATE AIRFRAME VIBRATION. FELT IN COCKPIT AND AFT CABIN. FO DISCONNECTED AUTOPLT AND DEPLOYED SPD BRAKE AND SLOWED ACFT APPROX 10 KTS. VIBRATION DISAPPEARED. VIBRATION WAS VERT VERSUS LATERAL. NO ECAM; FLT CTLS NORMAL. ACFT FLEW NORMAL ARR AND LNDG; NO INJURIES; NO DAMAGE NOTED. TALKED TO LINE MAINT AND SUBMITTED VIBRATION RPT; LOGGED WRITE-UP AFTER DISCUSSION WITH MAINT. MAINT INSPECTED ACFT AND FOUND NO INITIAL ABNORMALITIES.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT AT A LOWER ALT; THEY ACCELERATED TO A SPD AT WHICH THE VIBRATION FIRST OCCURRED BUT COULD NOT INDUCE IT AGAIN. FOLLOWING THEIR MAINT WRITE-UP; THE #1 ELAC (AILERON ELEVATOR COMPUTER) WAS CHANGED BECAUSE OF A MAINT NOTICE AND THAT THE ELEVATOR WAS RE-TRIMMED PRIOR TO THE NEXT FLT.
Data retrieved from NASA's ASRS site as of January 2009 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.