Preliminary Report: CASA makes forced landing

By: Mary F. Silitch

January 1, 2009
Accidents, Safety, Security and Training

Construcciones Aeronauticas SA CASA 212-200, Toksook Bay, Alaska, Nov. 1, 2008–The Arctic Transportation Services CASA 212 made a forced landing on the tundra when the captain was unable to maintain altitude after the right engine experienced a problem.

The airplane was on a VFR approach to Toksook Bay, when the copilot added power. The right engine failed to respond, and the aircraft yawed right.

The captain took control and initiated a go-around, adding power, but he was unable to maintain altitude or correct the yaw, and picked a tundra-covered area as an emergency landing site. The right landing gear and the right front portion of the fuselage hit the ground.

The cargo airplane was substantially damaged but no one was seriously injured. The pilot said he believed the negative-torque-sensing system of the Honeywell TPE331 turboprop, designed to automatically feather the propeller in the event of an engine failure, was not working properly.Inspection by the FAA revealed a missing bolt in the mechanical linkage that connects the cockpit-mounted engine power lever to the right engine propeller pitch control (PPC).

With the mechanical PPC linkage disconnected, the fuel control unit setting remained in the flight-idle position.

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