After we received the news at the beginning of May that the propeller on two DG-1000T motor gliders had come loose in flight, the use of the engine was prohibited with the publication of DG Service-Info SI116-25 and EASA Emergency AD 2025-0112-E.
We are currently working at full speed to enable the engines to be used again. This will be implemented in 2 phases.
First, there will be a transitional solution. In this, two holes will be drilled in the existing propeller adapter disk and each will be fitted with a locking bolt. These bolts will not bear any load during normal operation, but will merely prevent the two halves of the adapter disk from coming loose if the rubber should tear. This ensures that the propeller is held securely in place. The retrofitted propeller disk can then be used until the lifetime limit of 5 years or 50 engine operating hours specified in the manual has been reached.
The conversion is expected to be possible from the end of July. To do this, the propeller adapter must be removed, modified and tested. The modification and inspection can only be carried out at DG Aviation. For fast processing, the adapter can already be sent to DG Aviation. The specifications according to SI116-25 must be observed.
In the long term, the propeller disk will be redesigned. The new version of the propeller disk is then expected to be available from the winter half-year 2025/2026 and will also offer bolt-on options for balancing masses to enable dynamic propeller balancing. The lifetime limit of 5 years or 50 engine operating hours will remain unchanged for the new version.
If you have any further questions about the conversion, please do not hesitate to contact us at info@dg-aviation.de.