What happened
An investigation into the safety of microlight aircraft (MLA) operations has highlighted a recurring mechanical vulnerability in the Dynamic WT9 aircraft. The canopy latching and locking mechanism on this specific model has proven highly sensitive to operational errors. These errors can lead to the canopy opening unexpectedly while the aircraft is in flight. This specific failure mode is not an isolated incident; the investigation noted that similar occurrences have happened previously, including two fatal accidents.
The investigation
The Dutch Safety Board examined the design and regulatory oversight of the microlight sector. It was established that while the manufacturer, Aerospable, developed an improved locking system in 2019—featuring a safety latch and a sensor to prevent accidental opening—the installation of this upgraded hardware is currently only recommended rather than required.
Furthermore, the investigation looked into the regulatory landscape of MLA aviation. Because the perceived risk level for these operations is considered low, government oversight is minimal. Under current protocols, Special Certificates of Airworthiness are issued without a rigorous verification of the aircraft's actual airworthiness. This lack of stringent inspection means that flight safety relies heavily on the individual responsibility of aircraft owners, flying clubs, and pilots.
Findings
- The primary safety concern is the sensitivity of the Dynamic WT9 canopy latching system to improper operation, which creates a risk of in-flight canopy separation.
- There is a lack of mandatory oversight regarding the airworthiness of microlight aircraft during the issuance of certificates.
- Responsibility for safety is currently distributed between pilots, owners, and the government, but there is no evidence that all stakeholders are fully aware of their specific safety obligations.
Safety action
To mitigate these risks, the Safety Board has issued specific recommendations:
- The manufacturer, Aerospool, should make the installation of the canopy lock with the safety latch and sensor mandatory for all Dynamic WT9 aircraft.
- The Minister of Infrastructure and Water Management should implement measures to ensure that all pilots, holders, and organizations involved in MLA flying are aware of their active responsibility for maintaining safety and complying with regulations.