NTSB Identification: ANC83FAG02.
The docket is stored on NTSB microfiche number 20267.
Accident occurred Sunday, January 09, 1983 in CHUGIAK, AK
Aircraft: WILLBIRD 2, registration: N37875
Injuries: 1 Serious.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

AS THE AIRCRAFT LIFTED OFF, THE NOSE PITCHED UP ALARMINGLY AND APPLICATION OF FULL DOWN ELEVATOR CONTROL HAD NO APPARENT EFFECT. THE PILOT WAS ABLE TO LOWER THE NOSE BY EXTENDING FULL FLAPS. HOWEVER, HE WAS UNABLE TO LATCH THE MANUAL FLAPS IN THE DOWN POSITION AND THE EFFORTS TO HOLD THE FLAPS DOWN WAS BEYOND HIS PHYSICAL ENDURANCE. AS THE FLAPS RETRACTED, THE NOSE PITCHED UP AND THE AIRCRAFT STALLED AT ABOUT 100 FT AGL. THE AIRCRAFT THEN FELL OFF ON THE LEFT WING AND PITCHED NOSE DOWN. IT CRASHED THROUGH POWER LINES AND BIRCH TREES IN A SLIGHT NOSE, LEFT WING 40 DEG DOWN, ATTITUDE. AN INVESTIGATION REVEALED THAT A HINGE BEARING COMPONENT OF THE STABILATOR CONTROL HAD FAILED. SUBSEQUENTLY, THE STABILATOR MOVED FORWARD WHICH SLACKENED THE STABILATOR CONTROL CABLES AND RESULTED IN LOSS OF PITCH CONTROL. THE PILOT/OWNER OF THE HOMEBUILT AIRCRAFT RECOMMENDED WELDING (RATHER THAN BRAZING) HEAVILY STRESSED BEARINGS OR USE CAST, FORGED OR MACHINED PILLOW BLOCKS. THE PLANE HAD 229 HRS TOTAL FLT TIME.

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

FLIGHT CONTROL,STABILATOR ATTACHMENT..FAILURE,TOTAL

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

MAINTENANCE,INSTALLATION..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

INADEQUATE QUALITY CONTROL..MANUFACTURER


Contributing Factors

AIRCRAFT HANDLING..NOT POSSIBLE..PILOT IN COMMAND


Contributing Factors

OBJECT..WIRE,TRANSMISSION


Contributing Factors

OBJECT..TREE(S)


Contributing Factors

STALL..UNCONTROLLED..PILOT IN COMMAND

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