<< >> NASA ASRS Report 222004, September 1992

Captain of air carrier light transport aircraft lost control of the aircraft after encountering in-flight icing conditions resulting in excursion from assigned altitude.

Attributes
ACN	222004
Time
Date	199209
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : leb
State Reference	NH
Altitude	msl bound lower : 16500 msl bound upper : 18000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	cruise other descent other other
Route In Use	enroute airway : zbw
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 160 flight time total : 11500 flight time type : 600
ASRS Report	222004
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 160 flight time total : 3300 flight time type : 160
ASRS Report	222008
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

In cruise flight at FL180 over lebanon VOR, IMC conditions, light to moderate icing conditions, OAT -7 degrees C. Icing suddenly became severe. Airspeed decayed rapidly until initiating stick shaker and pusher. Altitude could not be maintained, clearance for lower altitude from ATC was obtained as aircraft descended. Control of airplane was regained at 16500 and subsequently descended to 12000 ft and warmer air. All anti- icing and deicing equipment was on and operating prior to the incident.

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Original NASA ASRS Text

Title: CAPT OF ACR LTT ACFT LOST CTL OF THE ACFT AFTER ENCOUNTERING INFLT ICING CONDITIONS RESULTING IN EXCURSION FROM ASSIGNED ALT.

Narrative: IN CRUISE FLT AT FL180 OVER LEBANON VOR, IMC CONDITIONS, LIGHT TO MODERATE ICING CONDITIONS, OAT -7 DEGS C. ICING SUDDENLY BECAME SEVERE. AIRSPD DECAYED RAPIDLY UNTIL INITIATING STICK SHAKER AND PUSHER. ALT COULD NOT BE MAINTAINED, CLRNC FOR LOWER ALT FROM ATC WAS OBTAINED AS ACFT DSNDED. CTL OF AIRPLANE WAS REGAINED AT 16500 AND SUBSEQUENTLY DSNDED TO 12000 FT AND WARMER AIR. ALL ANTI- ICING AND DEICING EQUIP WAS ON AND OPERATING PRIOR TO THE 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.