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A B727-200 in descent at 12000 ft. When flaps 5 degrees selected experienced a low frequency airframe vibration not related to engine power changes.
| Attributes | |
| ACN | 377177 |
| Time | |
| Date | 199708 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 125 flight time total : 9800 flight time type : 3000 |
| ASRS Report | 377177 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa other other : unspecified cockpit |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Slowed to 180 KTS at 12000 ft MSL, we selected flaps to 5 degrees. Afterwards a low frequency vibration began. Appeared to be airframe because throttle movement didn't affect it. Continued intermittently on subsequent descent and approach. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a B727-200 and the low frequency vibration was not engine related because power changes did not change vibration. Reporter states the trailing edge flaps were not retracted to eliminate the flaps as a cause of the vibrations. The reporter advised that no information was available from maintenance as to the corrective action for the vibrations.
Original NASA ASRS Text
Title: A B727-200 IN DSCNT AT 12000 FT. WHEN FLAPS 5 DEGS SELECTED EXPERIENCED A LOW FREQ AIRFRAME VIBRATION NOT RELATED TO ENG PWR CHANGES.
Narrative: SLOWED TO 180 KTS AT 12000 FT MSL, WE SELECTED FLAPS TO 5 DEGS. AFTERWARDS A LOW FREQ VIBRATION BEGAN. APPEARED TO BE AIRFRAME BECAUSE THROTTLE MOVEMENT DIDN'T AFFECT IT. CONTINUED INTERMITTENTLY ON SUBSEQUENT DSCNT AND APCH. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B727-200 AND THE LOW FREQ VIBRATION WAS NOT ENG RELATED BECAUSE PWR CHANGES DID NOT CHANGE VIBRATION. RPTR STATES THE TRAILING EDGE FLAPS WERE NOT RETRACTED TO ELIMINATE THE FLAPS AS A CAUSE OF THE VIBRATIONS. THE RPTR ADVISED THAT NO INFO WAS AVAILABLE FROM MAINT AS TO THE CORRECTIVE ACTION FOR THE VIBRATIONS.
Data retrieved from NASA's ASRS site as of July 2007 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.