What was found
AIRCRAFT EXPERIENCED HORIZONTAL STABILIZER STALL DURING APPROACH, DURING SEVERE ICING. AIRCRAFT RECOVERED FROM STALL AND LANDING NORMAL. INSPECTION OF TAIL DE-ICE SYSTEM FOUND BLEED AIR LEAKING IN AFT PART OF TAIL AT 90 DEGREE ELBOW. DURING REMOVAL OF 90 DEGREE ELBOW IT WAS FOUND THAT THE WIGGINS SEALS WERE INSTALLED INCORRECTLY, UNABLE TO DETERMINE WHEN THIS FITTING WAS INSTALLED. COULD HAVE COME FROM MFG DURING PRODUCTION. HAS NOT BEEN CHANGED BY OWNER IN 11 YEARS. TAIL AND WING HEAT FUNCTIONAL CHECKED NORMAL AT LAST INSPECTION. NO INFO IN MM FOR INSTALLING THIS TYPE. (K)