NTSB Identification: DEN88DTE06.
The docket is stored on NTSB microfiche number 36743.
Accident occurred Friday, July 01, 1988 in ENGLEWOOD, CO
Probable Cause Approval Date: 07/10/1989
Aircraft: HELFRICH-LEONARD BD-5B, registration: N250TH
Injuries: 1 Uninjured.

THIS EXPERIMENTAL ACFT IS POWERED BY A MODIFIED HONDA 1250 CC, WATERCOOLED ENG. THE PLT REPORTED THAT AFTER TAKEOFF THE ENG TEMP REACHED THE REDLINE AND THE ENG LOST POWER. DURING THE FORCED LANDING THE MAIN LANDING GEAR COLLAPSED. EXAMINATION OF THE ENG AFTER THE ACDT REVEALED THAT A HOLE WAS BURNED IN THE #4 PISTON AND A PORTION OF THE HEAD GASKET BETWEEN THE #3 AND #4 CYL WAS MISSING. THE OWNER AND TECHNICIANS FAMILIAR WITH THE ENG SUGGEST A LARGER RADIATOR, RETIMING OF THE IGNITION, AND/OR A RICHER MIXTURE MAY PRECLUDE RECURRENCE OF THE PROBLEM.

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

POWERPLANT..OVERTEMPERATURE

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

ENGINE ASSEMBLY,PISTON..BURNED

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

ACFT/EQUIP,INADEQUATE DESIGN..MANUFACTURER


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN


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