NTSB Identification: LAX87LA099.
The docket is stored on NTSB microfiche number 35883.
Accident occurred Sunday, January 18, 1987 in LEMON COVE, CA
Probable Cause Approval Date: 03/31/1989
Aircraft: HUGHES 369D, registration: N1107N
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 PLT RPRTD THAT WHILE AT 100 TO 150 FT AGL ON AN APCH TO LAND, THE ENG LOST PWR AS THOUGH IT HAD FLAMED OUT. HE ENTERED AN AUTOROTATION, BUT WAS UNABLE TO REACH THE HELIPAD. SUBSEQUENTLY, THE HELICOPTER LANDED IN TREES & WAS BADLY DMGD. DRG THE INVESTIGATION, THE ENG WAS REMOVED FM THE AIRFRAME & OPERATIONALLY CHECKED, BUT NO REASON WAS FOUND FOR THE PWR LOSS. DISASSEMBLY OF THE ENG REVEALED SVRL DISCREPANCIES, BUT NONE OF WHICH WOULD HAVE SINGULARLY RESULTED IN A FLAME-OUT. AN EXAM OF THE ENG'S INTERNAL COMBUSTION LINER REVEALED AN OVERTEMP BLISTER, CRACKS ON THE FLANGE & NON- APPROVED WELDS; A REQD MOD OF THE LINER WASN'T COMPLETED. THE IGNITER & FUEL NOZZLE MOUNTING PAD ON THE OUTER COMBUSTIONLINER WAS SLIGHTLY DISPLACED (.009' FM PERPENDICULAR), RESULTING IN A SLIGHT DISPLACEMENT OF THE FLAME PATTERN INSIDE THE INNER LINER. THE #1 PWR TURBINE NOZZLE WAS BURNED, CRACKED & ERODED. THERE WAS EVIDENCE THE ENG HAD EXPERIENCED 1 OR MORE OVERTEMP CONDS, POSSIBLY FM HOT STARTS, HI PWR LVLS OR LACK OF COOLING BFR ENG SHUTDOWNS.

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

TURBOSHAFT ENGINE..PREVIOUS DAMAGE



Contributing Factors

OBJECT..TREE(S)


Contributing Factors

MAINTENANCE..IMPROPER

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