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A jetstream 3201 in climb declared an emergency and diverted due to aircraft vibration caused by ice accumulation on both propellers.
| Attributes | |
| ACN | 387245 |
| Time | |
| Date | 199712 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : stl |
| State Reference | MO |
| Altitude | msl bound lower : 0 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : stl tower : lyh |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 31 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 3100 flight time type : 480 |
| ASRS Report | 387245 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other other : unspecified cockpit |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
During icing conditions, aircraft experienced moderate vibration. Crew declared emergency so we could leave icing conditions quickly. Thud was heard and aircraft stopped vibrating. Continuing to land to get out of icing conditions, crew elected to land overweight. Landing was normal, postflt was normal. Aircraft icing equipment checked normal. Probable cause was ice not being removed from propeller, causing imbal, which in turn caused vibration. Ice finally broke free from propeller (thud) and a normal flight resulted.
Original NASA ASRS Text
Title: A JETSTREAM 3201 IN CLB DECLARED AN EMER AND DIVERTED DUE TO ACFT VIBRATION CAUSED BY ICE ACCUMULATION ON BOTH PROPS.
Narrative: DURING ICING CONDITIONS, ACFT EXPERIENCED MODERATE VIBRATION. CREW DECLARED EMER SO WE COULD LEAVE ICING CONDITIONS QUICKLY. THUD WAS HEARD AND ACFT STOPPED VIBRATING. CONTINUING TO LAND TO GET OUT OF ICING CONDITIONS, CREW ELECTED TO LAND OVERWT. LNDG WAS NORMAL, POSTFLT WAS NORMAL. ACFT ICING EQUIP CHKED NORMAL. PROBABLE CAUSE WAS ICE NOT BEING REMOVED FROM PROP, CAUSING IMBAL, WHICH IN TURN CAUSED VIBRATION. ICE FINALLY BROKE FREE FROM PROP (THUD) AND A NORMAL FLT RESULTED.
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.