NTSB Identification: DEN92LA041.
The docket is stored on NTSB microfiche number 45926.
Accident occurred Friday, March 06, 1992 in LAKEWOOD, CO
Probable Cause Approval Date: 06/11/1993
Aircraft: ENSTROM F28, registration: N95NR
Injuries: 1 Minor,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.
ENGINE POWER WAS LOST AND THE PILOT INITIATED AN AUTOROTATION. THE PILOT SAID HE HAD 'INDICATIONS POWER WAS NORMAL' SO HE PULLED COLLECTIVE. THE HELICOPTER IMPACTED A ROADWAY. POST ACCIDENT EXAMINATION DISCLOSED THE FLEXIBLE AIR DUCT, BETWEEN THE AIR FILTER BOX AND THE TURBOCHARGER INLET, HAD BECOME DISCONNECTED AND HAD COLLAPSED. THE CLAMP SECURING THE AIR DUCT TO THE AIR FILTER BOX WAS LOOSE AND HAD SLIPPED OFF.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: THE PREMATURE USE OF COLLECTIVE BY THE PILOT DURING AN AUTOROTATION. FACTORS WERE: THE DISCONNECTION AND SUBSEQUENT COLLAPSE OF THE INDUCTION AIR LINE.
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