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Government aircraft has ice and wind shear encounter, cannot maintain assigned altitude. Altitude deviation.
| Attributes | |
| ACN | 196519 |
| Time | |
| Date | 199112 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : jac |
| State Reference | WY |
| Altitude | msl bound lower : 14600 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : san |
| Operator | other |
| Make Model Name | Light Transport, High Wing, 2 Turboprop Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zlc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 9300 flight time type : 150 |
| ASRS Report | 196519 |
| Person 2 | |
| Affiliation | government other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 14000 flight time type : 300 |
| ASRS Report | 196603 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather other anomaly |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were climbing out of 8500 to 15000 from idaho falls to jackson. Had trouble climbing from 14000 to 15000 and advised center (ice was cause for poor climb). Also advised trouble maintaining 15000 when finally reached. Requested 14000 and they were unable. Upon reaching jac VOR and turning northbound for procedure turn for ILS 18, experienced wind shear and loss of altitude in turn due to ice and shear. Lost approximately 400 ft. Notified center of reason for sudden altitude loss when they questioned us about it and told us there was traffic at 14000. Had a request to call FAA in slc upon landing. We explained situation and were requested to send letter describing the incident. Advised FAA to save center tapes regarding our request for 14000 and inability to climb and maintain 15000 earlier. Wind at 15000 at jac VOR, according to INS, was 75 KTS at 270 (on lee side of grand tetons). Basically we had a momentary emergency due to ice and wind and were doing our best to control the aircraft. Loss of altitude had nothing to do with complacency or inattn.
Original NASA ASRS Text
Title: GOV ACFT HAS ICE AND WIND SHEAR ENCOUNTER, CANNOT MAINTAIN ASSIGNED ALT. ALTDEV.
Narrative: WE WERE CLBING OUT OF 8500 TO 15000 FROM IDAHO FALLS TO JACKSON. HAD TROUBLE CLBING FROM 14000 TO 15000 AND ADVISED CENTER (ICE WAS CAUSE FOR POOR CLB). ALSO ADVISED TROUBLE MAINTAINING 15000 WHEN FINALLY REACHED. REQUESTED 14000 AND THEY WERE UNABLE. UPON REACHING JAC VOR AND TURNING NBOUND FOR PROC TURN FOR ILS 18, EXPERIENCED WIND SHEAR AND LOSS OF ALT IN TURN DUE TO ICE AND SHEAR. LOST APPROX 400 FT. NOTIFIED CENTER OF REASON FOR SUDDEN ALT LOSS WHEN THEY QUESTIONED US ABOUT IT AND TOLD US THERE WAS TFC AT 14000. HAD A REQUEST TO CALL FAA IN SLC UPON LNDG. WE EXPLAINED SITUATION AND WERE REQUESTED TO SEND LETTER DESCRIBING THE INCIDENT. ADVISED FAA TO SAVE CENTER TAPES REGARDING OUR REQUEST FOR 14000 AND INABILITY TO CLB AND MAINTAIN 15000 EARLIER. WIND AT 15000 AT JAC VOR, ACCORDING TO INS, WAS 75 KTS AT 270 (ON LEE SIDE OF GRAND TETONS). BASICALLY WE HAD A MOMENTARY EMER DUE TO ICE AND WIND AND WERE DOING OUR BEST TO CTL THE ACFT. LOSS OF ALT HAD NOTHING TO DO WITH COMPLACENCY OR INATTN.
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.