BE1900 pilots have aircraft control problems after taking off without deicing aircraft.

Attributes
ACN	450566
Time
Date	199909
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cys.airport
State Reference	WY
Altitude	msl single value : 12000
Environment
Flight Conditions	IMC
Weather Elements	Snow Fog
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 121
Flight Phase	cruise : level descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 195 flight time total : 725 flight time type : 194
ASRS Report	450566
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather inflight encounter other non adherence : company policies non adherence : far
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : declared emergency flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft Weather Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On the early morning hours of sep/xa/99 (approximately XA00) we (captain and I) landed in snowy WX at dia. We were on the ground for approximately 2 hours during which time it snowed on and off. On the preflight walkaround, we assessed the snow on the wings and concluded it would blow off upon engine startup. At the beginning of our takeoff roll, the wings checked clear of snow and ice. The captain was flying. Upon reaching an intermediate altitude of 12000 ft, he had full elevator trim forward and continued to have forward pressure on the yoke. At this point, the captain asked me to get cys approach plates and to plan to divert there. Cys approach asked if we would like priority handling, to which we replied yes. We asked for the ILS frequency and inbound course for the sake of easiness and getting information in a quick expeditious way. We completed the approach. We wrote the plane up. The plane checked ok after a mechanic checked it out. We deiced fully and proceeded to billings without further incident.

Original NASA ASRS Text

Title: BE1900 PLTS HAVE ACFT CTL PROBS AFTER TAKING OFF WITHOUT DEICING ACFT.

Narrative: ON THE EARLY MORNING HRS OF SEP/XA/99 (APPROX XA00) WE (CAPT AND I) LANDED IN SNOWY WX AT DIA. WE WERE ON THE GND FOR APPROX 2 HRS DURING WHICH TIME IT SNOWED ON AND OFF. ON THE PREFLT WALKAROUND, WE ASSESSED THE SNOW ON THE WINGS AND CONCLUDED IT WOULD BLOW OFF UPON ENG STARTUP. AT THE BEGINNING OF OUR TKOF ROLL, THE WINGS CHKED CLR OF SNOW AND ICE. THE CAPT WAS FLYING. UPON REACHING AN INTERMEDIATE ALT OF 12000 FT, HE HAD FULL ELEVATOR TRIM FORWARD AND CONTINUED TO HAVE FORWARD PRESSURE ON THE YOKE. AT THIS POINT, THE CAPT ASKED ME TO GET CYS APCH PLATES AND TO PLAN TO DIVERT THERE. CYS APCH ASKED IF WE WOULD LIKE PRIORITY HANDLING, TO WHICH WE REPLIED YES. WE ASKED FOR THE ILS FREQ AND INBOUND COURSE FOR THE SAKE OF EASINESS AND GETTING INFO IN A QUICK EXPEDITIOUS WAY. WE COMPLETED THE APCH. WE WROTE THE PLANE UP. THE PLANE CHKED OK AFTER A MECH CHKED IT OUT. WE DEICED FULLY AND PROCEEDED TO BILLINGS WITHOUT FURTHER 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.