Engine Component Failure Forces Emergency Landing in Blouberg Mountains

Casualties unknown • Blouberg Mountains +/- 40 NM west of Louis Trichardt, ZA

A pilot flying an Enstrom 280C was forced to perform an auto-rotational landing in the Blouberg Mountains after a mechanical failure caused severe vibrations and engine over-speed.

What happened

On November 27, 2002, a private flight departing from Pietersburg encountered a critical mechanical issue while en route to a landing zone atop the Blouberg Mountains. While climbing at roughly 60 mph, the pilot of the ENSTROM 280C, registration ZS-HNH, detected intense high-frequency vibrations. In an effort to move away from the rising mountain terrain, the pilot initiated a left turn.

During this maneuver, the pilot noted unusual noises from the engine compartment accompanied by the smell of burning rubber. This was followed by the illumination of a red clutch warning light and a noticeable increase in engine RPM. At an altitude of approximately 300 feet above ground level, the pilot executed an auto-rotational landing on a mountain ledge.

Upon touchdown in an open area, the helicopter skidded about five meters. The impact caused the main rotor blades to sever the tail boom, and the blades subsequently struck a small tree. Despite the significant impact, there were no injuries and no fatalities. After shutting down the engine and electrical systems, the pilot exited the aircraft safely but remained in a remote area without radio or cellular coverage, eventually walking to a location where signal could be reached to request rescue.

Probable cause

The failure of the Idler Pulley Actuator Arm, caused by prolonged exposure to high vibration and high strain levels, led to a slack drive belt pulley, resulting in engine over-speed and the clutch warning.

Frequently asked questions

What happened in the 2002-11-27 Enstrom 280C accident near Blouberg Mountains +/- 40 NM west of Louis Trichardt, ZA?

A pilot flying an Enstrom 280C was forced to perform an auto-rotational landing in the Blouberg Mountains after a mechanical failure caused severe vibrations and engine over-speed.

What aircraft was involved and where did it happen?

The accident on 2002-11-27 involved a Enstrom 280C, registration ZS-HNH, at Blouberg Mountains +/- 40 NM west of Louis Trichardt, ZA.

What was the probable cause of the accident?

The failure of the Idler Pulley Actuator Arm, caused by prolonged exposure to high vibration and high strain levels, led to a slack drive belt pulley, resulting in engine over-speed and the clutch warning.

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