Everybody knows that a bad thing is when you get air in the brake system of your car, late brakes or no brakes can be the result, and that is very bad. It's normal procedure for each of us to bleed the air from the brakes after worked on this. Your engine fuel system is much more sensitive against air as your car brakes. A bad thing is when air is behind the rubber membrane instead of fuel. In the worst case a total failure can be happen when an air disturbed unit is additional controlled by a timer or a RPM regulator and did not finish his job till the next control input comes in.
Air bubbles are extremely dangerous if inside in the system and the flight altitude is high.
The pressure difference can cause heavy problems in the stable compressor work by wrong working compressor bleed air valves. The only right way is to bleed the air from the system in a correct manner and with correct tools. For more assistance contact us at Czech Jet. These charts are provided as a courtesy to L39 users from Czech Jet. We have been in contact with the factory and have obtained their position.