The crew of a mu-2B-60 loses control of their aircraft at 4500 ft during a climb out in heavy icing, recovering from a stall after a fall of some 4000 ft 90 miles sse of fai, ak.

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Attributes
ACN	522830
Time
Date	200107
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : fai.vortac
State Reference	AK
Altitude	msl single value : 14500
Environment
Flight Conditions	IMC
Weather Elements	Ice
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zan.artcc tower : ord.tower
Operator	common carrier : charter
Make Model Name	MU-2B 60 Marquise
Operating Under FAR Part	Part 135
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : cfi pilot : atp
Experience	flight time last 90 days : 180 flight time total : 8000 flight time type : 200
ASRS Report	522830
Person 2
Affiliation	company : charter
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather inflight encounter other non adherence : far non adherence : published procedure other anomaly other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : exited adverse environment flight crew : regained aircraft control flight crew : returned to original clearance
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft Weather
Primary Problem	Weather

Narrative:

While on climb out (J-115) encountered light rime at approximately 11000 ft. Engine anti-ice, propeller heat, and leading edge boots on. 180 KTS, 1200 FPM, and 8 degree pitch. Ice accumulation gradually increased in intensity. Propellers were shedding ice; leading edge boots were somewhat effective. At approximately 14500 ft airspeed decreased from 180 KTS to 125 KTS, climb rate decreased from 1200 FPM to 200 FPM within 10 to 15 seconds. Aircraft stalled with recovery at approximately 10600 ft. Ice was observed on underside of wing just before loss of control. Ice reported as moderate to severe. Flight continued without further incident, early recognition and escape procedures have been implemented. Amount of ice and rate of accumulation was not considered an immediate threat relative to experience with other aircraft. OAT neg 8 degrees, tops EST at 15000 ft, blue sky could be seen through breaks in could, prior to rapid performance loss, the escape plan was to continue climb through clouds. Cabin crew have been further trained and advised to spot and report buildup of ice. Particularly on underside of wing and tail area.

Original NASA ASRS Text

Title: THE CREW OF A MU-2B-60 LOSES CTL OF THEIR ACFT AT 4500 FT DURING A CLIMB OUT IN HEAVY ICING, RECOVERING FROM A STALL AFTER A FALL OF SOME 4000 FT 90 MILES SSE OF FAI, AK.

Narrative: WHILE ON CLIMB OUT (J-115) ENCOUNTERED LIGHT RIME AT APPROX 11000 FT. ENGINE ANTI-ICE, PROP HEAT, AND LEADING EDGE BOOTS ON. 180 KTS, 1200 FPM, AND 8 DEG PITCH. ICE ACCUMULATION GRADUALLY INCREASED IN INTENSITY. PROPS WERE SHEDDING ICE; LEADING EDGE BOOTS WERE SOMEWHAT EFFECTIVE. AT APPROX 14500 FT AIRSPEED DECREASED FROM 180 KTS TO 125 KTS, CLIMB RATE DECREASED FROM 1200 FPM TO 200 FPM WITHIN 10 TO 15 SECONDS. ACFT STALLED WITH RECOVERY AT APPROX 10600 FT. ICE WAS OBSERVED ON UNDERSIDE OF WING JUST BEFORE LOSS OF CONTROL. ICE REPORTED AS MODERATE TO SEVERE. FLT CONTINUED WITHOUT FURTHER INCIDENT, EARLY RECOGNITION AND ESCAPE PROCEDURES HAVE BEEN IMPLEMENTED. AMOUNT OF ICE AND RATE OF ACCUMULATION WAS NOT CONSIDERED AN IMMEDIATE THREAT RELATIVE TO EXPERIENCE WITH OTHER ACFT. OAT NEG 8 DEGS, TOPS EST AT 15000 FT, BLUE SKY COULD BE SEEN THROUGH BREAKS IN COULD, PRIOR TO RAPID PERFORMANCE LOSS, THE ESCAPE PLAN WAS TO CONTINUE CLIMB THROUGH CLOUDS. CABIN CREW HAVE BEEN FURTHER TRAINED AND ADVISED TO SPOT AND REPORT BUILDUP OF ICE. PARTICULARLY ON UNDERSIDE OF WING AND TAIL AREA.

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.