NTSB Identification: NYC88LA018.
The docket is stored on NTSB microfiche number 36788.
Accident occurred Sunday, October 25, 1987 in LACONIA, NH
Probable Cause Approval Date: 06/07/1989
Aircraft: ENSTROM F-28C, registration: N51699
Injuries: 3 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
THE PLT RPRTD HE WAS DEMONSTRATING A FULL TOUCHDOWN AUTOROTATION IN WINDS THAT WERE FROM 290 DEG AT 15 GUSTING 20 KTS. HE STATED THE TOUCHDOWN WAS SOFT WITH A LOT OF PITCH PULLED IN; HOWEVER, AS HE LOWERED THE COLLECTIVE AFTER TOUCHDOWN, THE RETREATING BLADE FLEXED DOWNWARD & SEVERED THE AFT PORTION OF THE TAIL BOOM & THE TAIL ROTOR DRIVE SHAFT. THE PLT BELIEVED HE HAD LOWERED THE COLLECTIVE TOO FAST AFTER TOUCHDOWN, WHICH WOULD HAVE ALLOWED THE BLADES TO FLAP DOWNWARD. ALSO, HE BELIEVED THE HIGH WIND & REDUCED RPM FROM THE AUTOROTATION WOULD HAVE ATTRIBUTED TO EXCESSIVE FLAPPING OF THE RETREATING ROTOR BLADES.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:PLANNING/DECISION..IMPROPER..PILOT IN COMMAND
The National Transportation Safety Board determines the probable cause(s) of this accident to be:COLLECTIVE..IMPROPER USE OF..PILOT IN COMMAND
WEATHER CONDITION..UNFAVORABLE WIND
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