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20000229014359A

Accident · Substantial damage
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FAA accident report · Amtr XF4 · Brooksville, FL · February 29, 2000

FAA Aviation Safety Information Portal

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Date
February 29, 2000 · 15:45 local
Place
Brooksville, FL
Airport
Hernando County
Phase of flight
Fcd/Prec Ldg From Cruise
Operating rules
General operating rules (Part 91)
Damage
Substantial damage
Aircraft
N9VY
NTSB investigation
NTSBATL00LA030
Reported as
Amtr XF4
Reported engine
Lycoming O320*
Fatal injuries
0
Pilot’s flight hours
8,866 total9 in this make and model5 in the last 90 days
N9VYRegistration cancelled Apr 18, 2000 · Burak Stanley A XF4S/N 1973-92Airframe modelBurak Stanley A XF4

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(.4) Approximately 35 minutes in to the flight, the pilot experienced a loss of propeller thrust. The pilot stated that he heard a loud 'bang' from the engine compartment and experienced loss of thrust. The pilot said that the engine tachometer went to redline, and the propeller RPM decreased. The pilot said , changing the engine RPM did not change the propeller RPM. The pilot declared an emergency and started an emergency descent for a landing on runway 27. As the pilot maneuvered the airplane on the final approach, he cleared a stand of trees on the final approach to runway 27. While on short final to land, the airplane initially collided with the ground short of the runway surface and subsequently came to rest on a taxiway. The examination of the wreckage revealed that the rex flex coupling assembly had failed and that three out of the six rex bolts had also failed. The pilot stated that the flexidyne drive shaft was designed for a 100 horse-power engine. The pilot/builder stated that he installed a 150 horse power engine on the airplane.

As the FAA filed it

(.4) APPROXIMATELY 35 MINUTES IN TO THE FLIGHT, THE PILOT EXPERIENCED A LOSS OF PROPELLER THRUST. THE PILOT STATED THAT HE HEARD A LOUD 'BANG' FROM THE ENGINE COMPARTMENT AND EXPERIENCED LOSS OF THRUST. THE PILOT SAID THAT THE ENGINE TACHOMETER WENT TO REDLINE, AND THE PROPELLER RPM DECREASED. THE PILOT SAID , CHANGING THE ENGINE RPM DID NOT CHANGE THE PROPELLER RPM. THE PILOT DECLARED AN EMERGENCY AND STARTED AN EMERGENCY DESCENT FOR A LANDING ON RUNWAY 27. AS THE PILOT MANEUVERED THE AIRPLANE ON THE FINAL APPROACH, HE CLEARED A STAND OF TREES ON THE FINAL APPROACH TO RUNWAY 27. WHILE ON SHORT FINAL TO LAND, THE AIRPLANE INITIALLY COLLIDED WITH THE GROUND SHORT OF THE RUNWAY SURFACE AND SUBSEQUENTLY CAME TO REST ON A TAXIWAY. THE EXAMINATION OF THE WRECKAGE REVEALED THAT THE REX FLEX COUPLING ASSEMBLY HAD FAILED AND THAT THREE OUT OF THE SIX REX BOLTS HAD ALSO FAILED. THE PILOT STATED THAT THE FLEXIDYNE DRIVE SHAFT WAS DESIGNED FOR A 100 HORSE-POWER ENGINE. THE PILOT/BUILDER STATED THAT HE INSTALLED A 150 HORSE POWER ENGINE ON THE AIRPLANE.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.

NTSB ATL00LA030Accident · Minor injuriesLimited investigationFinal reportBrooksville, FLThe owner/builder's failure to build the airplane within the design stress limits of the drive shaft assembly, that resulted in the failure of the Flex Coupling Retention Bolts.Feb 29, 2000 · Substantial damage