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An SF340 flight crew allows ice to build up on their propellers at 16000 ft. The aircraft loses airspace and altitude as crew attempts to clear the ice off of the propellers.
| Attributes | |
| ACN | 405453 |
| Time | |
| Date | 199806 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : alo |
| State Reference | IA |
| Altitude | msl bound lower : 15500 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340A |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | 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 : 270 flight time total : 5500 flight time type : 1500 |
| ASRS Report | 405453 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : published procedure non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
We encountered moderate to severe rime ice at 16000 ft. I didn't react to it quickly enough and as a result lost about 30 KTS of airspeed. I called for maximum power and disconnected the autoplt, lowered the nose to regain airspeed. We descended about 500 ft. ZAU was notified and we initiated a climb back to 16000 ft. We had been in the aircraft for about 7 hours without a break, having showed at XA15. Fatigue played a very large part in this situation. The first officer saw the situation developing and said nothing. I believe I may have fallen asleep for a few moments. I was awakened by the propellers vibrating because of the ice accumulation on them.
Original NASA ASRS Text
Title: AN SF340 FLC ALLOWS ICE TO BUILD UP ON THEIR PROPS AT 16000 FT. THE ACFT LOSES AIRSPACE AND ALT AS CREW ATTEMPTS TO CLR THE ICE OFF OF THE PROPS.
Narrative: WE ENCOUNTERED MODERATE TO SEVERE RIME ICE AT 16000 FT. I DIDN'T REACT TO IT QUICKLY ENOUGH AND AS A RESULT LOST ABOUT 30 KTS OF AIRSPD. I CALLED FOR MAX PWR AND DISCONNECTED THE AUTOPLT, LOWERED THE NOSE TO REGAIN AIRSPD. WE DSNDED ABOUT 500 FT. ZAU WAS NOTIFIED AND WE INITIATED A CLB BACK TO 16000 FT. WE HAD BEEN IN THE ACFT FOR ABOUT 7 HRS WITHOUT A BREAK, HAVING SHOWED AT XA15. FATIGUE PLAYED A VERY LARGE PART IN THIS SIT. THE FO SAW THE SIT DEVELOPING AND SAID NOTHING. I BELIEVE I MAY HAVE FALLEN ASLEEP FOR A FEW MOMENTS. I WAS AWAKENED BY THE PROPS VIBRATING BECAUSE OF THE ICE ACCUMULATION ON THEM.
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.