Narrative:

On climb out after leaving cloud layer at 14000 ft MSL in light mixed icing, cycled deice boots and aircraft started to shake and shudder. Indicated airspeed was 200 KTS, altitude was approximately 15000 ft MSL. Disconnected autoplt and aircraft rolled approximately 15 degrees left. I was able to right aircraft and trim for wings level flight. However, aircraft continued to shake. We declared an emergency and proceeded to be vectored to portland, or. We were cleared to various lower altitudes and I increased airspeed to 225 KTS. The vibrations became worse as well as ctlability. I then reduced airspeed to approximately 175 KTS. The vibration decreased. On the descent we again entered icing conditions and left icing conditions approximately 5000 ft MSL, however, vibrations continued. We did an ILS approach to pdx and landed at flaps 12 degrees and approach was flown at 150 KTS. Normal landing and rollout. After engine shutdown, it was discovered that the left deice boot, outboard of the engine nacelle had ruptured. There appeared to be approximately a 16 inch tear in the boot and it was 'peeled' back over the upper and lower wing surfaces. Hence the left roll and vibration. The first officer and myself were unsure of the cause of the problem. We selected a reduced flap setting and higher approach speed to minimize the possibility of stalling the aircraft.

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Original NASA ASRS Text

Title: COMMUTER ACFT HAS DEICE BOOT RUPTURE ON CLBOUT. EMER DECLARED.

Narrative: ON CLBOUT AFTER LEAVING CLOUD LAYER AT 14000 FT MSL IN LIGHT MIXED ICING, CYCLED DEICE BOOTS AND ACFT STARTED TO SHAKE AND SHUDDER. INDICATED AIRSPD WAS 200 KTS, ALT WAS APPROX 15000 FT MSL. DISCONNECTED AUTOPLT AND ACFT ROLLED APPROX 15 DEGS L. I WAS ABLE TO RIGHT ACFT AND TRIM FOR WINGS LEVEL FLT. HOWEVER, ACFT CONTINUED TO SHAKE. WE DECLARED AN EMER AND PROCEEDED TO BE VECTORED TO PORTLAND, OR. WE WERE CLRED TO VARIOUS LOWER ALTS AND I INCREASED AIRSPD TO 225 KTS. THE VIBRATIONS BECAME WORSE AS WELL AS CTLABILITY. I THEN REDUCED AIRSPD TO APPROX 175 KTS. THE VIBRATION DECREASED. ON THE DSCNT WE AGAIN ENTERED ICING CONDITIONS AND LEFT ICING CONDITIONS APPROX 5000 FT MSL, HOWEVER, VIBRATIONS CONTINUED. WE DID AN ILS APCH TO PDX AND LANDED AT FLAPS 12 DEGS AND APCH WAS FLOWN AT 150 KTS. NORMAL LNDG AND ROLLOUT. AFTER ENG SHUTDOWN, IT WAS DISCOVERED THAT THE L DEICE BOOT, OUTBOARD OF THE ENG NACELLE HAD RUPTURED. THERE APPEARED TO BE APPROX A 16 INCH TEAR IN THE BOOT AND IT WAS 'PEELED' BACK OVER THE UPPER AND LOWER WING SURFACES. HENCE THE L ROLL AND VIBRATION. THE FO AND MYSELF WERE UNSURE OF THE CAUSE OF THE PROB. WE SELECTED A REDUCED FLAP SETTING AND HIGHER APCH SPD TO MINIMIZE THE POSSIBILITY OF STALLING THE ACFT.

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.