MADISON, WI, USA
N383MQ
SHORT BROTHERS SD3-60
WHILE ON A STABILIZED FINAL APPROACH, THE PILOT EXPERIENCED AN UNCOMMANDED RIGHT ROLL WHEN THE FLAP SETTING WAS INCREASED FROM FIVE TO FIFTEEN DEGREES. THE CONDITION WAS ALLEVIATED WHEN THE FLAPS WERE RESET TO FIVE DEGREES. POST FLIGHT INSPECTION REVEALED THAT THE RIGHT OUTBOARD FLAP POSITION SIGNALLING CABLE HAD FAILED. INSPECTION OF THE OPERATOR'S FLEET FOUND TWO ADDITIONAL AIRCRAFT WITH CHAFFED/FRAYED FLAP POSITION SIGNALLING CABLES. ALL CHAFFED/FRAYED CABLES WERE INSTALLED ON AIRCRAFT WHICH THE OPERATOR HAD PURCHASED AS A SERIES. ON THIS SERIES OF AIRCRAFT THE FLAPS AND CONTROL RIGGING WERE INSTALLED BY THE VENDOR WHICH MANUFACTURES THE WINGS, RATHER THAN THE MANUFACTURER OF THE AIRFRAME, AS IS NORMALLY THE CASE.
FAILURE OF THE RIGHT OUTBOARD FLAP POSITION SIGNALLING CABLE DUE TO CHAFFING INITIATED BY IMPROPER INSTALLATION/RIGGING BY A MANUFACTURER'S VENDOR.
Source: NTSB Aviation Accident Database
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