Landing gear collapse causes substantial damage to Beech F33A at Lanseria

Casualties unknown • Grenchen Flugplatz (LSZG), SO, CH

A private flight involving a Beech F33A ended in a landing gear collapse at Lanseria Aerodrome after the pilot was unable to confirm the gear was locked.

What happened

On 19 September 2017, a Beech F33A, registration ZS-OGD, departed from the Borneo airstrip in the Timbavati game reserve for a private flight to Lanseria Aerodrome (FALA). During the approach to Lanseria, the pilot performed standard pre-landing checks, which included attempting to extend the undercarriage. However, the green indication lights on the instrument panel failed to illuminate.

In an effort to verify the gear status, the pilot requested permission from Air Traffic Control (ATC) to perform a fly-past of runway 25 so that controllers could visually inspect the landing gear. While ATC reported that the gear appeared to be down, the cockpit indicators remained unconfirmed. The pilot then attempted to manually extend the gear using a hand pump and performed a second fly-past over runway 07. During this second pass, ATC observed that the undercarriage appeared to be only partially extended.

Despite the lack of green lights in the cockpit, the pilot proceeded to land on runway 25. Upon touchdown, the undercarriage collapsed. Although fire services were on standby, there were no injuries to the pilot or the passenger. The aircraft sustained substantial damage to its propeller, undercarriage, and underbelly.

Probable cause

The landing gear extension system failed because a stiff bearing in the landing gear motor caused the motor to draw excessive current, triggering the circuit breaker and cutting power to the system.

Frequently asked questions

What happened in the 2019-08-01 THE NEW PIPER AIRCRAFT, INC. PA-28-161 accident near Grenchen Flugplatz (LSZG), SO, CH?

A private flight involving a Beech F33A ended in a landing gear collapse at Lanseria Aerodrome after the pilot was unable to confirm the gear was locked.

What aircraft was involved and where did it happen?

The accident on 2019-08-01 involved a THE NEW PIPER AIRCRAFT, INC. PA-28-161, registration HB-PPG, at Grenchen Flugplatz (LSZG), SO, CH.

What was the probable cause of the accident?

The landing gear extension system failed because a stiff bearing in the landing gear motor caused the motor to draw excessive current, triggering the circuit breaker and cutting power to the system.

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