What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The aircraft over nighted in cyyz where a hard rain driven by gusty winds hitting the aircraft from the rear for quite a period of time. Upon departure from cyyz and while climbing to altitude the aircraft elevator froze and was uncontroable. An emergency was declared into mke and as the aircraft came down into warmer air the elevator control was regained by the flight crew. An inspection of the aircraft by mwea at mke did not find any definitive cause for this problem. This is the 4th time mwea has had this condition happen to one of thier aircraft. They all experienced the same preflight conditions;ie, driving wind 30MPH and hard rain. Horizontal stabilizer rub seals were replaced as precautionary but there was no evidence showing that this would correct the problem. In the investigation, type 4 anti-ice fluid was noted as a problem since it will get into pulley areas and became dry then as water hits is placed on top of the dried type 4 it became particalley reactive but then freezes at altitude. Mwea is putting in place during their "a" check inspections a hot type 1 deicing fluid wash to clean out any remaining dried type 4 fluid. This type 4 fluid has been identified as part of the problem. privacy data omitted This recommendation was part of a Boeing aircraft company recommendation which was part of the findings.
As the FAA filed it
THE AIRCRAFT OVER NIGHTED IN CYYZ WHERE A HARD RAIN DRIVEN BY GUSTY WINDS HITTING THE AIRCRAFT FROM THE REAR FOR QUITE A PERIOD OF TIME. UPON DEPARTURE FROM CYYZ AND WHILE CLIMBING TO ALTITUDE THE AIRCRAFT ELEVATOR FROZE AND WAS UNCONTROABLE. AN EMERGENCY WAS DECLARED INTO MKE AND AS THE AIRCRAFT CAME DOWN INTO WARMER AIR THE ELEVATOR CONTROL WAS REGAINED BY THE FLIGHT CREW. AN INSPECTION OF THE AIRCRAFT BY MWEA AT MKE DID NOT FIND ANY DEFINITIVE CAUSE FOR THIS PROBLEM. THIS IS THE 4TH TIME MWEA HAS HAD THIS CONDITION HAPPEN TO ONE OF THIER AIRCRAFT. THEY ALL EXPERIENCED THE SAME PREFLIGHT CONDITIONS;IE, DRIVING WIND 30MPH AND HARD RAIN. HORIZONTAL STABILIZER RUB SEALS WERE REPLACED AS PRECAUTIONARY BUT THERE WAS NO EVIDENCE SHOWING THAT THIS WOULD CORRECT THE PROBLEM. IN THE INVESTIGATION, TYPE 4 ANTI-ICE FLUID WAS NOTED AS A PROBLEM SINCE IT WILL GET INTO PULLEY AREAS AND BECAME DRY THEN AS WATER HITS IS PLACED ON TOP OF THE DRIED TYPE 4 IT BECAME PARTICALLEY REACTIVE BUT THEN FREEZES AT ALTITUDE. MWEA IS PUTTING IN PLACE DURING THEIR "A" CHECK INSPECTIONS A HOT TYPE 1 DEICING FLUID WASH TO CLEAN OUT ANY REMAINING DRIED TYPE 4 FLUID. THIS TYPE 4 FLUID HAS BEEN IDENTIFIED AS PART OF THE PROBLEM. ^PRIVACY DATA OMITTED^ THIS RECOMMENDATION WAS PART OF A BOEING AIRCRAFT COMPANY RECOMMENDATION WHICH WAS PART OF THE FINDINGS.