NTSB Identification: DEN90LA098.
The docket is stored on NTSB microfiche number 42118.
Accident occurred Saturday, April 21, 1990 in ELIZABETH, CO
Probable Cause Approval Date: 09/28/1992
Aircraft: CESSNA 310B, registration: N6641B
Injuries: 3 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 COMMERCIAL, (CFI), PILOT WAS PERFORMING A TRAINING FLIGHT. DURING SINGLE ENGINE TRAINING, THE LEFT PROPELLER BEGAN AN UNCOMMANDED RETURN TO FLAT PITCH. THE CFI TOOK THE CONTROLS, MADE A PRECAUTIONARY LANDING, AND INSPECTED THE PROPELLER. AFTER AN EXTENSIVE RUNUP, THE CFI ELECTED TO ATTEMPT A TKAEOFF FROM A NEARBY DIRT ROAD. DURING INITIAL CLIMB, AT 20 FEET AGL, THE LEFT PROPELLER WENT INTO FLAT PITCH, CAUSED THE PLANE TO YAW TO THE LEFT, THE LEFT WING DROPPED AND THE PLANE LANDED HARD, WITH THE GEAR RETRACTED. THE LANDING GEAR, BOTH WINGS, AND THE GUSELAGE WERE BENT AND TWISTED. THE LEFT PROPELLER DOME SHOWED EVIDENCE OF OIL LEAKAGE OVER A PERIOD OF TIME. THE LEFT ENGINE CONTAINED 3 QUARTS OF OIL, WHICH WAS BELOW THE MINIMUM LEVEL. ONE PROPELLER BLADE ON THE LEFT ENGINE HAD A BROKEN PITCH CHANGE LINK. THE DOME WAS EXTENSIVELY CRACKED AND HAD BEGUN TO DISINTEGRATE.

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

THE PILOT'S ATTEMPT TO TAKEOFF WITH A KNOWN DEFICIENCY AND THE PARTIAL FAILURE OF THE PROPELLER FEATHERING SYSTEM.

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