NTSB Identification: MKC87LA102.
The docket is stored on NTSB microfiche number 34171.
Accident occurred Thursday, May 07, 1987 in FAYETTEVILLE, AR
Probable Cause Approval Date: 11/08/1988
Aircraft: ENSTROM F-28A, registration: N13CM
Injuries: 2 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 PIC WAS DEMONSTRATING THE HELO TO A PROSPECTIVE CUSTOMER. THE PIC WAS HOVERING IN A REMOTE AREA WITH ROUGH AND UNEVEN TERRAIN. THE PIC RPTD OUTSIDE AIR TEMPS OF ABT 90 DEGREES DURING THE DEMO FLT. THE PIC STATED THAT HE WAS MOVING AROUND OVER THE GRND IN A 3 TO 5 FT HOVER. THE PIC STATED THAT NO WIND WAS BLOWING AND HE WAS MOVING TO GET FRESH AIR THROUGH THE ROTORS. THE PIC THEN NOTICED THAT ENG RPM WAS DECREASING AND INCREASED THROTTLE TO COMPENSATE. THE PIC STATED THAT RPM CONTINUED TO DECREASE AND THE HELO BEGIN TO DESCEND DESPITE FULL THROTTLE. THE PIC STATED THAT HE HAD TO MANEUVER THE HELO BACK TO THE SPOT HE HAD INITALLY APPROACHED TO AVOID LANDING ON ROUGH AND UNEVEN TERRAIN. THE PIC STATED THAT THIS POSED A PBLM TO IMMEDIATE TOUCHDOWN AS HE MOVED THE HELO TO THE SMOOTH LNDG AREA. THE HELO SUBSEQUENTLY HARD LANDED SHORT OF THE LNDG AREA SUSTAINING SUBSTANTIAL DAMAGE. NO MECH MALF WAS DISCOVERED DURING INSP.

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

ROTOR RPM..NOT MAINTAINED..PILOT IN COMMAND

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