NTSB Identification: MIA88FA213.
The docket is stored on NTSB microfiche number 37084.
Accident occurred Monday, July 04, 1988 in LAKE WALES, FL
Probable Cause Approval Date: 09/19/1989
Aircraft: FRANKLIN DRIFTER XP-503, registration: N65DF
Injuries: 2 Fatal.

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 OWNER RPRTD THE PLT FLEW THE ACFT AT A COMPANY PICNIC WITHOUT AUTHORIZATION. COMPANY PSNL SAW THE EXPERIMENTAL, AMATEUR BUILT ACFT TAKEOFF FROM THE COMPANY STRIP, THEN MANEUVER FOR A LOW PASS OVER THE AREA AT ABOUT 150 TO 200 FT AGL. SOME ESTIMATED THE PASS WAS MADE WITH A SPEED IN EXCESS OF 100 MPH. THE NEVER EXCEED (VNE) SPEED FOR THE ACFT WAS 95 MPH. AS THE ACFT APCHD THE AREA OF THE PICNIC, WITNESSES HEARD A BUZZING OR FLUTTERING SOUND. AS IT CONTINUED OVERHEAD, WITNESSES NOTED THE LEFT AILERON HAD BECOME DETACHED FROM THE OUTBOARD END & HAD FOLDED AFT. SUBSEQUENTLY, THE RGT AILERON FAILED IN A SIMILAR MANNER. THE ACFT ENTERED A CLIMB & SOME WITNESSES NOTED A POWER REDUCTION AS IF THE PLT WAS TRYING TO SLOW THE ACFT. HOWEVER, THE ACFT ROLLED & ENTERED A DSCNT WHICH WAS DESCRIBED AS A STALL/SPIN CONDITION. RPRTDLY, THE PLT WAS AWARE OF THE ACFT'S TENDENCY TO ENCTR AILERON BUZZ OR FLUTTER WHEN ACCELERATED ABOVE 100 MPH.

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

AIRSPEED(VNE)..EXCEEDED..PILOT IN COMMAND

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

FLIGHT CONTROL,AILERON..FLUTTER

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

FLIGHT CONTROL,AILERON ATTACHMENT..FAILURE,TOTAL

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

DESIGN STRESS LIMITS OF AIRCRAFT..EXCEEDED..PILOT IN COMMAND



Contributing Factors

LOW PASS..PERFORMED..PILOT IN COMMAND

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