What happened
On November 7, 2008, at approximately 13:00 UTC, a Mooney M20R aircraft registered as ZS-SDY crashed while attempting to land at the Opuwo Landing Strip in Namibia. The pilot escaped without injury, but the aircraft sustained substantial damage after colliding with the airport perimeter fence just short of the runway threshold.
The incident occurred during a ferry flight from South Africa to Canada. On November 6, the pilot had departed Port Elizabeth for Ondangwa, Namibia. During that leg, he experienced an immediate loss of engine power after switching fuel selectors while at flight level 140. He regained power by activating the low boost pump and spent the remainder of the nine-hour flight experimenting with various fuel tank configurations to maintain engine operation.
The following morning, the pilot conducted a ground run-up at Ondangwa, which showed no abnormalities. He then flew a local test flight to Opuwo, covering the distance in 50 minutes with normal engine performance. After landing on Runway 21, the engine quit during rollout. The pilot restarted it on the runway and took off again to investigate a suspected clogged fuel filter at Ondangwa.
Shortly after becoming airborne from Opuwo, the engine began running roughly. The pilot returned to Opuwo, entering the traffic pattern for Runway 21. While on the base leg, he reduced power to idle to lose altitude. Moments later, he experienced partial power loss. He attempted to reach the runway by cutting short the approach and activating the low boost pump. Although the engine recovered slightly, the aircraft fell short of the threshold, striking the perimeter fence before impacting the sealed portion of the runway.
The investigation
Namibian investigators examined the flight history, maintenance records, and wreckage. The pilot held valid Airline Transport Pilot Licenses from Germany and the United States but lacked a South African validation for the flight. The aircraft was manufactured in 2008 and had flown only 30.4 hours since its last Mandatory Periodic Inspection (MPI) on April 23, 2008.
Maintenance records indicated that all Airworthiness Directives and Service Bulletins were complied with during the last MPI. The aircraft was equipped with two extra fuel tanks for the long-distance ferry flight, interconnected with the standard fuel system via a custom selector. Investigators found no evidence of fuel contamination or mechanical failure in the engine itself that would prevent normal operation.
Weather conditions were fine with unrestricted visibility and light winds. The investigation confirmed the aircraft did not stall and remained under control until impact. Fatigue and medical issues were ruled out as factors.
Findings
The primary cause of the accident was the pilot's decision to continue flying despite experiencing engine roughness and partial power loss. Investigators determined that the pilot suffered from a possible fuel restriction during the previous flight leg, which resulted in an insufficient fuel supply between the tanks and the engine. Although he managed to keep the engine running using the boost pump, the underlying issue persisted.
Key findings included:
- The pilot continued the flight with a known rough-running engine rather than returning to the departure airport for troubleshooting.
- A possible fuel restriction caused partial power loss during the final approach.
- The aircraft was operated without the required South African license validation.
- Maintenance was performed according to approved programs, and no mechanical defects were found that would explain the power loss.
Safety action
Investigators issued safety recommendations emphasizing that pilots should not continue a flight with an unairworthy aircraft or known engine issues. They stressed the importance of proper airmanship and responsibility for safety. Additionally, they recommended that pilots ensure all required documentation is on board as per relevant regulations.