NTSB Identification: ATL88FA220.
The docket is stored on NTSB microfiche number 37599.
Accident occurred Sunday, July 24, 1988 in LA GRANGE, GA
Probable Cause Approval Date: 09/25/1989
Aircraft: PIPER PA-28-151, registration: N4506F
Injuries: 2 Uninjured.

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.

THE PIC STATED HE HAD A HARDOVER IN THE SINGLE AXIS AUTOPILOT WHICH RESULTED IN THE ACFT CONSTANTLY TURNING RIGHT. THEREFORE DUE TO THE CONTINOUS BANK HE ELECTED TO MAKE A PRECAUTIONARY LANDING IN A LAKE VERSUS ON LAND. THE ACFT IMPACTED IN A LAKE LEFT OF THE PLANNED COURSE. THE ROLL SERVO WAS DESIGNED SO THAT WHEN POWER WAS REMOVED FROM THE SERVO A SPRING DISENGAGED THE SERVO FROM THE AILERON BRIDLE CABLE. THE SPRING WAS FOUND FUNCTIONAL AFTER RECOVERY OF THE ACFT FROM THE LAKE. WITNESSES RPTED SEEING THE ACFT FLYING ABOUT 10-15 FEET ABOVE THE LAKE SURFACE FOR ABOUT ONE QUARTER MILE. AS THE ACFT APPROACHED A BRIDGE IT PULLED UP ABRUPTLY, STALLED, AND IMPACTED THE WATER.

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

BUZZING..INTENTIONAL..PILOT IN COMMAND

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

OSTENTATIOUS DISPLAY..PILOT IN COMMAND

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

PULL-UP..ABRUPT..PILOT IN COMMAND

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

STALL..ENCOUNTERED..PILOT IN COMMAND



Contributing Factors

LIGHT CONDITION..DUSK

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