What happened
On 4 August 2021, a Piper Super Cub, registration ZU-ITC, was conducting a repositioning flight from Krugersdorp Airfield to Robertson Airfield. The flight included a pilot and one passenger, with a planned refueling stop at Karoo Gateway (formerly Beaufort West Airfield).
While the pilot was aware of a NOTAM stating that Runway 12 was closed for maintenance, the aircraft encountered significant communication difficulties upon approaching the airfield. The pilot attempted to contact Karoo Radio on the primary frequency but received no response. Subsequent attempts to establish contact via the general flying area frequency, a telephone call from the passenger, and the use of an onboard portable radio were all unsuccessful.
Unable to communicate with the tower, the pilot initiated an unmanned joining procedure for Runway 03, maintaining a higher altitude of 3,000 feet to ensure safety. During the final approach, the pilot successfully established radio contact, only to be instructed to perform a go-around and avoid Runway 03. The pilot then transitioned to Runway 35, where the aircraft landed safely.
The investigation
SACAA AIID examined the circumstances surrounding the failed communication and the near-use of the closed runway. The investigation revealed that the radio issues were caused by a corroded headset connection jack. Once the jack was cleaned, normal radio functionality was restored.
Findings
- The primary cause of the incident was an attempt to land on a closed runway resulting from intermittent radio transmissions and the absence of visible signage on the closed strip.
- The pilot was unable to receive instructions due to a hardware failure in the aircraft's audio connection.
- There was a lack of appropriate marking or signage on Runway 03 to indicate its closed status.
Safety action
- It is recommended that airfield management implement signage on closed runways that is clearly visible from the air, ensuring compliance with SA-CATS Part 139.02.23.12 requirements.