Unstable Approach Leads to Aircraft Excursion at Private Gauteng Airstrip

Casualties unknown • Wolfenschiessen, NW, CH

A Savannah XL V6 aircraft sustained substantial damage after a hard landing and subsequent runway excursion at a private airstrip in Mogale, Gauteng.

What happened

On the morning of 3 June 2023, a private flight departing from Kroon Airfield in Gauteng experienced a serious incident during landing at a private airstrip in Mogale. The aircraft, a Savannah XL V6 with registration ZU-RE-FKA, was operating under Part 94 regulations in clear visual meteorological conditions.

As the pilot approached the grass runway from the south, the aircraft's descent became unstable. While approaching the threshold, the aircraft sank toward an electric boundary fence, prompting the pilot to apply power to climb and clear the obstacle before reducing power again. The aircraft subsequently made a hard landing on the runway. Following the impact, the aircraft drifted to the left, where the left wheel struck a mound of raised ground. This impact caused the aircraft to bounce and careen over a low embankment, eventually coming to a stop in nearby bushland. There were no injuries to the pilot, though the aircraft suffered substantial damage.

The investigation

SACAA AIID investigators examined the aircraft and the site conditions following the incident. The inspection of ZU-FKA revealed damage to the propeller blades, the transponder aerial, and a crease on the right wing leading edge, along with a slightly bent main landing gear.

Regarding the operational environment, the investigation confirmed that the private airstrip was in a suitable condition for use, with dry grass and favorable weather. The aircraft was found to be airworthy and properly maintained, with all necessary documentation and inspections up to date. The pilot held a valid National Pilot Licence and a current medical certificate.

Findings

  • The primary cause of the incident was an unstable approach resulting in a hard touchdown.
  • The pilot lost directional control of the aircraft following the hard landing.
  • The aircraft's path was diverted by a mound of raised ground on the left side of the runway, which triggered a bounce and the subsequent excursion over an embankment.

Probable cause

The aircraft was on an unstable approach and experienced a hard landing, which led to a loss of directional control and a runway excursion.

Frequently asked questions

What happened in the 2008-05-12 COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA S.P.A. A109K2 accident near Wolfenschiessen, NW, CH?

A Savannah XL V6 aircraft sustained substantial damage after a hard landing and subsequent runway excursion at a private airstrip in Mogale, Gauteng.

What aircraft was involved and where did it happen?

The accident on 2008-05-12 involved a COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA S.P.A. A109K2, registration HB-XWM, at Wolfenschiessen, NW, CH.

What was the probable cause of the accident?

The aircraft was on an unstable approach and experienced a hard landing, which led to a loss of directional control and a runway excursion.

Investigation report by the Swiss Transportation Safety Investigation Board (STSB / SUST). Original record: https://www.sust.admin.ch/inhalte/AV-berichte/2065.pdf. This page is a structured re-presentation; facts and quotes are in the Swiss Transportation Safety Investigation Board (STSB), Switzerland.

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