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A D-328 captain reported that his deicing boots failed, picked up ice at an alarming rate, and exercised captain's emergency authority/authorized and turned off his assigned heading to exit the WX area.
| Attributes | |
| ACN | 616161 |
| Time | |
| Date | 200405 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : mmj.vortac |
| State Reference | PA |
| Altitude | msl bound lower : 7000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Snow Ice Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Do 328 TP (Turboprop) |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | controller radar : 4 flight time last 90 days : 100 flight time total : 3200 flight time type : 2700 |
| ASRS Report | 616161 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather inflight encounter other non adherence : clearance other spatial deviation |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment flight crew : overcame equipment problem flight crew : took evasive action |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Weather |
| Primary Problem | Aircraft |
Narrative:
Descending into IMC conditions around 10000 ft, we encountered severe icing upon entering the clouds. The accumulation was around 1/2 - 3/4 inch in 5-10 seconds. We then experienced a total airfoil deice failure (all the boots). I told the first officer to immediately turn right 90 degrees. I attempted to inform ATC that we were deviating from course, but was blocked. I finally established contact and asked for immediate lower altitude. ATC cleared us down to 8000 ft and direct our previous course when able. We were still in moderate ice without protection and I asked for lower. We were given lower and broke out at 6000 ft. Had we not commenced the turn before getting approval, I believe that the safety of the flight may have been in jeopardy with the amount of ice without protection. We landed in pit 10 mins later with a clean aircraft without incident.
Original NASA ASRS Text
Title: A D-328 CAPT RPTED THAT HIS DEICING BOOTS FAILED, PICKED UP ICE AT AN ALARMING RATE, AND EXERCISED CAPT'S EMER AUTH AND TURNED OFF HIS ASSIGNED HDG TO EXIT THE WX AREA.
Narrative: DSNDING INTO IMC CONDITIONS AROUND 10000 FT, WE ENCOUNTERED SEVERE ICING UPON ENTERING THE CLOUDS. THE ACCUMULATION WAS AROUND 1/2 - 3/4 INCH IN 5-10 SECONDS. WE THEN EXPERIENCED A TOTAL AIRFOIL DEICE FAILURE (ALL THE BOOTS). I TOLD THE FO TO IMMEDIATELY TURN R 90 DEGS. I ATTEMPTED TO INFORM ATC THAT WE WERE DEVIATING FROM COURSE, BUT WAS BLOCKED. I FINALLY ESTABLISHED CONTACT AND ASKED FOR IMMEDIATE LOWER ALT. ATC CLRED US DOWN TO 8000 FT AND DIRECT OUR PREVIOUS COURSE WHEN ABLE. WE WERE STILL IN MODERATE ICE WITHOUT PROTECTION AND I ASKED FOR LOWER. WE WERE GIVEN LOWER AND BROKE OUT AT 6000 FT. HAD WE NOT COMMENCED THE TURN BEFORE GETTING APPROVAL, I BELIEVE THAT THE SAFETY OF THE FLT MAY HAVE BEEN IN JEOPARDY WITH THE AMOUNT OF ICE WITHOUT PROTECTION. WE LANDED IN PIT 10 MINS LATER WITH A CLEAN ACFT WITHOUT INCIDENT.
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.