NTSB Identification: DEN82FTM11
14 CFR Part 137: Agricultural
Accident occurred Wednesday, April 28, 1982 in VERMAL, UT
Probable Cause Approval Date: 04/28/1983
Aircraft: BELL 47G-3B-1, registration: N48217
Injuries: 3 Serious.

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 PILOT STATED THAT HE EXPERIENCED A PARTIAL LOSS OF ENGINE POWER DURING LANDING AT AN ELEVATION OF ABOUT 5280 FT MSL. THE TEMPERATURE WAS ABOUT 50 DEGREES FAHRENHEIT. HE APPLIED FULL THROTTLE, BUT THE RPM DECAYED AND THE PLANE CRASH LANDED. A PARTIAL ENGINE TEARDOWN REVEALED THAT THE GROUNDING WIRE ON THE RIGHT MAGNETO WAS DISCONNECTED. ON THIS MAGNETO, A BENDIX S-200, THE DISCONNECTED WIRE WOULD CAUSE THE MAGNETO TO GROUND OUT AND CEASE FUNCTIONING. WITH ONE MAGNETO GROUNDED, THERE WOULD BE A LOSS OF ABOUT 200 RPM.

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

IGNITION SYSTEM,LOW TENSION WIRING..DISCONNECTED

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

IGNITION SYSTEM,MAGNETO..INOPERATIVE


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

TERRAIN CONDITION..HIGH TERRAIN

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