To create a stock of these covers that get damaged very easily.
High use consumable - OEM out of business so many technologies used to replicate.
Complex machining of tiny cast valve part
Stocks gone through maintainence damage
Stocks ran out through damage - reversed engineering offered stronger, lighter versions.
Extremely complex mix of electronics, wiring and machining for high reliability application.
Very basic power input PCB - but too old for OEM to support - upgrades and better design.
100% copy of original backpack but with much higher quality stitching and materials.
To source full specification bearings for a civil helicopter modification - a development program