NTSB Identification: DEN83LA144.
The docket is stored on NTSB microfiche number 22472.
Accident occurred Saturday, June 18, 1983 in BRIGHTON, CO
Aircraft: PIPER PA-22-160, registration: N2801Z
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

AFTER ENTERING THE LANDING PATTERN, THE PLT NOTED BINDING OF THE AILERON CONTROL SYSTEM. REPORTEDLY THE AILERON CONTROLS SEEMED TO LOCK, SO HE USED THE RUDDERS FOR DIRECTIONAL CONTROL & LANDED IN A PLOWED FIELD. DURING THE LANDING, THE ACFT NOSED OVER. AN EXAM REVEALED THAT THE PIPER AUTO CONTROL SYS (WING LEVELER) HAD BECOME ENGAGED. WITH THE WING LEVELER ENGAGED, AN EXTRAORDINARY AMOUNT OF CONTROL FORCE WAS REQUIRED TO OVERCOME A GEAR SYS. THE PLT BELIEVED THAT THE WING LEVELER CONTROL, PN 751-519, VIBRATED INTO THE ENGAGED POSITION.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AUTOPILOT/FLIGHT DIRECTOR..UNDETERMINED



Contributing Factors

TERRAIN CONDITION..SOFT

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