NTSB Identification: DEN92IA067.
The docket is stored on NTSB microfiche number 46792.
Incident occurred Sunday, June 28, 1992 in SCIPIO, UT
Probable Cause Approval Date: 06/30/1993
Aircraft: BELL 222UT, registration: N222UH
Injuries: 3 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
THE EMS HELICOPTER ENCOUNTERED CLEAR AIR TURBULENCE WHILE EN ROUTE TO PICK UP A PATIENT. DURING THE EVENT, THE NOSE PITCHED UP RAPIDLY TO ABOUT 20 DEGREES, ACTIVATING THE ELT. THE PILOT FELT FEEDBACK THROUGH THE CONTROLS AND LANDED TO RESET THE ELT. LATER, THE PILOT NOTED MAST TORQUE FLUCTUATIONS FOLLOWED BY A ZERO READING ON THE GAUGE. POSTFLIGHT INSPECTION DISCLOSED THE TRANSMISSION HAD CONTACTED ITS MOUNTS, SEVERING SEVERAL ELECTRICAL LEADS INCLUDING THE TORQUE SENSOR. A CRACK WAS ALSO DISCOVERED ABOUT 2 1/2 FEET OUTBOARD OF THE MAIN BLADE GRIP, PROPAGATING BACK FROM THE BLADE LEADING EDGE.
The National Transportation Safety Board determines the probable cause(s) of this incident to be: AN ENCOUNTER WITH CLEAR AIR TURBULENCE.
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