NTSB Identification: SEA88LA127.
The docket is stored on NTSB microfiche number 36465.
Accident occurred Wednesday, July 13, 1988 in HAINES, AK
Probable Cause Approval Date: 06/09/1989
Aircraft: ENSTROM F-28F, registration: N8620C
Injuries: 1 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 PILOT PURCHASED THE HELICOPTER WITH AN UNDOCUMENTED MODIFICATION DESIGNED TO RESTRAIN THE COLLECTIVE. REPORTEDLY, HERECEIVED NO GUIDANCE REGARDING THE USE OF THE COLLECTIVE HOLD-DOWN DEVICE. ACCORDING TO THE AIRCRAFT MANUFACTURER THERE EXISTED NO ENSTROM APPROVED COLLECTIVE HOLD-DOWN DEVICES OTHER THAN THE INSTALLED FRICTION LOCK. AFTER ENGINE START THE PILOT USED TWO HANDS TO RELEASE THE COLLECTIVE FRICTION. THE ENSTROM F28 'BEFORE TAKEOFF' CHECKLIST WARNS PILOTS TO 'KEEP HAND ON COLLECTIVE AND MAINTAIN DOWN POSITION WHEN (COLLECTIVE) LOCK IS DISENGAGED', AFTER RELEASING THE LOCK THE PILOT SAID THE COLLECTIVE SPRUNG TO THE FULL UP POSITION. THE AIRCRAFT ROLLED TO THE LEFT ABOUT ITS LONGITUDINAL AXIS. THE PILOT STATED THAT HE RELIED ON THE MODIFICATION, A COLLECTIVE HOLD-DOWN CHAIN, TO KEEP THE COLLECTIVE SECURE.

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

COLLECTIVE..INATTENTIVE..PILOT IN COMMAND

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

CHECKLIST..NOT FOLLOWED..PILOT IN COMMAND


Contributing Factors

ROTORCRAFT FLIGHT CONTROL,COLLECTIVE CONTROL..INCORRECT


Contributing Factors

MAINTENANCE,MODIFICATION..NOT UNDERSTOOD..PILOT IN COMMAND

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