Narrative:

We were being vectored for ILS 16 (swf). Vectored from downwind to 30 degree intercept for localizer, cleared for approach (sfc wind was 220 degrees at 12 KTS, gust at 18 KTS). As we initiated the turn, it became apparent that our downwind track was close in to the localizer. Localizer came alive halfway through the turn, becoming apparent that we were going to go through localizer. Airspeed was 140 KTS. As I banked to 30 degrees, the aircraft lost an inordinate amount of lift and descended rapidly 400' below assigned altitude. Maximum power was called for, wings leveled, and altitude was regained within approximately 5 seconds. We had noticed a good deal of vibration on the airframe descending through 6000' due to moderate rime ice building on the baggage pod. Anti-ice systems were all on at the time. The baggage pod has no anti-ice protection. We were in moderate to occasionally severe turbulence, which we reported. Our duty time began at 30 hours. We logged 6-7 hours in 6 legs, most of which was IMC. Crew evaluation of situation: 1) sharp altitude loss caused by airframe ice in approach confign; much more power required for turn, given icing; turbulence conditions. 2) fatigue of crew members (crew decided that continuing last leg to iad was not prudent given our fatigue level. Dispatch was called and we advised that we were cancelling the last flight due to WX and crew fatigue. Dispatch concurred. Crew dutied out and ron at swf). Aircraft has not autoplt. Had to hand-fly in IMC all day and shoot 5 approachs in low IFR.

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Original NASA ASRS Text

Title: FLT CREW OF LTT AT APCH SPEED WITH VISIBLE ICING ON ACFT LOST ALT IN TURN ONTO ILS.

Narrative: WE WERE BEING VECTORED FOR ILS 16 (SWF). VECTORED FROM DOWNWIND TO 30 DEG INTERCEPT FOR LOC, CLRED FOR APCH (SFC WIND WAS 220 DEGS AT 12 KTS, GUST AT 18 KTS). AS WE INITIATED THE TURN, IT BECAME APPARENT THAT OUR DOWNWIND TRACK WAS CLOSE IN TO THE LOC. LOC CAME ALIVE HALFWAY THROUGH THE TURN, BECOMING APPARENT THAT WE WERE GOING TO GO THROUGH LOC. AIRSPD WAS 140 KTS. AS I BANKED TO 30 DEGS, THE ACFT LOST AN INORDINATE AMOUNT OF LIFT AND DSNDED RAPIDLY 400' BELOW ASSIGNED ALT. MAX PWR WAS CALLED FOR, WINGS LEVELED, AND ALT WAS REGAINED WITHIN APPROX 5 SECS. WE HAD NOTICED A GOOD DEAL OF VIBRATION ON THE AIRFRAME DSNDING THROUGH 6000' DUE TO MODERATE RIME ICE BUILDING ON THE BAGGAGE POD. ANTI-ICE SYSTEMS WERE ALL ON AT THE TIME. THE BAGGAGE POD HAS NO ANTI-ICE PROTECTION. WE WERE IN MODERATE TO OCCASIONALLY SEVERE TURB, WHICH WE RPTED. OUR DUTY TIME BEGAN AT 30 HRS. WE LOGGED 6-7 HRS IN 6 LEGS, MOST OF WHICH WAS IMC. CREW EVALUATION OF SITUATION: 1) SHARP ALT LOSS CAUSED BY AIRFRAME ICE IN APCH CONFIGN; MUCH MORE PWR REQUIRED FOR TURN, GIVEN ICING; TURB CONDITIONS. 2) FATIGUE OF CREW MEMBERS (CREW DECIDED THAT CONTINUING LAST LEG TO IAD WAS NOT PRUDENT GIVEN OUR FATIGUE LEVEL. DISPATCH WAS CALLED AND WE ADVISED THAT WE WERE CANCELLING THE LAST FLT DUE TO WX AND CREW FATIGUE. DISPATCH CONCURRED. CREW DUTIED OUT AND RON AT SWF). ACFT HAS NOT AUTOPLT. HAD TO HAND-FLY IN IMC ALL DAY AND SHOOT 5 APCHS IN LOW IFR.

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.