Aviation Accident Summaries

Aviation Accident Summary SEA89FA122

PETERSBURG, AK, USA

Aircraft #1

N8042X

DOUGLAS DC-3C

Analysis

IMMEDIATELY AFTER TKOF AT 200-300 FT AGL, A PORTION OF FABRIC SEPD FROM THE R AILERON. WHILE MANEUVERING THE ACFT THE PLT'S CONTROL WHEEL BECAME FREE, AND HE ELECTED TO DITCH USING FULL RUDDER & DIFFERENTIAL POWER. EXAM OF THE PLT'S CONTROL WHEEL AILERON CONTROL CHAIN REVEALED THAT THE CHAIN FAILED DUE TO OVERLOAD. THE RIGHT SEAT WAS OCCUPIED BY A MECHANIC EMPLOYED BY THE OPERATOR AND HELD A PRIVATE PLT CERT WITH SINGLE & MULTIENGINE RATING. HE STATED THAT HE SUGGESTED TO THE PLT THAT HIS CONTROLS WERE FUNCTIONING NORMALLY, BUT THE PLT DISAGREED & PROCEEDED TO DITCH THE ACFT. EXAM OF THE RIGHT CONTROL YOKE REVEALED AILERON MOVEMENT IN THE CORRECT DIRECTION.

Probable Cause and Findings

THE PILOT'S IMPROPER DECISION TO DITCH THE AIRCRAFT WHEN IT COULD HAVE BEEN FLOWN BACK TO THE AIRPORT USING THE RIGHT SEAT CONTROLS. CONTRIBUTING FACTOR(S) WAS: THE FAILURE & SEPARATION OF A PORTION OF THE RIGHT AILERON FABRIC, AND THE PILOT'S EXCESSIVE FORCE APPLIED TO THE CONTROL WHEEL WHICH RESULTED IN OVERSTRESSING THE AILERON CONTROL CHAIN.

 

Source: NTSB Aviation Accident Database

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