NTSB Identification: ATL83FA312.
The docket is stored on NTSB microfiche number 23122.
Accident occurred Saturday, August 06, 1983 in GATLINGURG, TN
Aircraft: SIKORSKY S-58D, registration: N6488
Injuries: 3 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE HELICOPTER COLLIDED WITH TERRAIN ON A WOODED MOUNTAINSIDE AFTER LIFTOFF. THE PLT SAID A POWER LOSS OCCURRED AFTER ITWAS TO LATE TO ABORT. TAKEOFF WAS MADE FROM A LOT THAT WAS 5200 FT MSL. THE PLT HOVER-CHECKED AT 2500 RPM AND 39.5 INCHES OF MANIFOLD PRESSURE PRIOR TO TRANSITION TO FORWARD FLT. THE ACFT CLIMBED ONLY 20 FT BEFORE POWERLOSS OCCURRED. THERE WERE NO CHIP LIGHTS OR UNUSUAL ENGINE GAGE READINGS. THIS WAS THE PLTS 65TH TRIP FOR THE DAY. DURING THE IMPACT THE THE RIGHT LANDING GEAR COLLAPSED. DURING THE INVESTIGATION THE COMPRESSION WAS FOUND TO BE LOW ON 4 CYLINDERS, TWO OF WHICH WERE ZERO. TSO WAS 573 HOURS. THE CARBURETOR INLET SCREEN WAS PARTIALLY BLOCKED WITH FIBER LINT. COMPRESSION WAS BEING LOST THROUGH THE EXHAUST VALVES. FUEL FILTER WERE PARTIALLY OBSTRUCTED WITH CONTAMINANTS FROM FUEL DRUMS AT A WORKSITE.

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

FLUID,FUEL..CONTAMINATION

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

FATIGUE(FLIGHT SCHEDULE)..PILOT IN COMMAND

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

FUEL SYSTEM,SCREEN..BLOCKED(PARTIAL)

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

ENGINE ASSEMBLY,CYLINDER..LOW COMPRESSION


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

ABORT..NOT POSSIBLE..PILOT IN COMMAND


Contributing Factors

OBJECT..TREE(S)


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

ENGINE ASSEMBLY,VALVE,INTAKE..MOVEMENT RESTRICTED

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