After close checking of memory usage when boarding and exiting the Apache there's feedback saying that objects are getting freed and memory dumped, except it isn't. Only a small percentage. There are object references that are keeping the cockpit and avionic entities alive and preventing them from being released.

Going to take a little time to track each one down.

*edit*

The large memory leak located, was the TADS camera world not being released. It's been removed for now.

Source