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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Captain of air carrier medium large transport aircraft diverted to a nearby airport due to severe engine vibration.
| Attributes | |
| ACN | 216009 |
| Time | |
| Date | 199207 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mgy |
| State Reference | OH |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise 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 : 180 flight time total : 8700 flight time type : 1000 |
| ASRS Report | 216009 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Engine anti-icing on at FL310 MFDU displayed high vibration, .9 #1 engine confirmed by flight attendant in rear of aircraft. Accomplished vibration high checklist. Vibration in the green with engine at idle. In clear skies for 5 mins engine anti- icing on advance throttle got high vibration. Declared emergency, advised passenger and flight attendants of nature, time, etc. Diverted to dayton on final advanced throttle operated normal. Fix was to put silicone sealant where engine nose cone cap fits over nose cone. Manufacturer tolerance allows 2/32 gap to get under nose cap freeze and vibrate.
Original NASA ASRS Text
Title: CAPT OF ACR MLG ACFT DIVERTED TO A NEARBY ARPT DUE TO SEVERE ENG VIBRATION.
Narrative: ENG ANTI-ICING ON AT FL310 MFDU DISPLAYED HIGH VIBRATION, .9 #1 ENG CONFIRMED BY FLT ATTENDANT IN REAR OF ACFT. ACCOMPLISHED VIBRATION HIGH CHKLIST. VIBRATION IN THE GREEN WITH ENG AT IDLE. IN CLR SKIES FOR 5 MINS ENG ANTI- ICING ON ADVANCE THROTTLE GOT HIGH VIBRATION. DECLARED EMER, ADVISED PAX AND FLT ATTENDANTS OF NATURE, TIME, ETC. DIVERTED TO DAYTON ON FINAL ADVANCED THROTTLE OPERATED NORMAL. FIX WAS TO PUT SILICONE SEALANT WHERE ENG NOSE CONE CAP FITS OVER NOSE CONE. MANUFACTURER TOLERANCE ALLOWS 2/32 GAP TO GET UNDER NOSE CAP FREEZE AND VIBRATE.
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.