Cpr aircraft in icing slowed to min, started descent, cleared lower altitude icing eliminated. Retur...

Attributes
ACN	186237
Time
Date	199108
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : iow
State Reference	IA
Altitude	msl bound lower : 16600 msl bound upper : 17000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	general aviation : corporate
Make Model Name	Small Transport
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	186237
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Immediately after level off at 17000 ice started forming. Within 30 seconds we requested an altitude change due to icing. After our request ATC told us to switch frequencys and make request there which we did. Between the switching of frequencys and receiving the altitude change we lost approximately 400 ft due to ice and slow airspeed. The whole thing took between 60 and 180 seconds. ATC gave us a current altimeter setting which brought us up approximately 100 ft and we flew out of the conditions allowing us to climb, so we were immediately back up to FL170. These conditions of icing were moderate to severe, and unforecast.

Original NASA ASRS Text

Title: CPR ACFT IN ICING SLOWED TO MIN, STARTED DSCNT, CLRED LOWER ALT ICING ELIMINATED. RETURNED TO FL170.

Narrative: IMMEDIATELY AFTER LEVEL OFF AT 17000 ICE STARTED FORMING. WITHIN 30 SECONDS WE REQUESTED AN ALT CHANGE DUE TO ICING. AFTER OUR REQUEST ATC TOLD US TO SWITCH FREQS AND MAKE REQUEST THERE WHICH WE DID. BTWN THE SWITCHING OF FREQS AND RECEIVING THE ALT CHANGE WE LOST APPROX 400 FT DUE TO ICE AND SLOW AIRSPD. THE WHOLE THING TOOK BTWN 60 AND 180 SECONDS. ATC GAVE US A CURRENT ALTIMETER SETTING WHICH BROUGHT US UP APPROX 100 FT AND WE FLEW OUT OF THE CONDITIONS ALLOWING US TO CLB, SO WE WERE IMMEDIATELY BACK UP TO FL170. THESE CONDITIONS OF ICING WERE MODERATE TO SEVERE, AND UNFORECAST.

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.

Cpr aircraft in icing slowed to min, started descent, cleared lower altitude icing eliminated. Returned to FL170.