Don't get me started on fire warning faults and T Handles....
FL420 is way up there a cracked exhaust flange might give a fault up high and be hard to find on the ground. I assume the mechanics used soapy water on a running engine before they said there were no leaks.
Some aircraft, Piper Cheyenne III comes to mind can have a bleed air leak with no indication.
When you pull the power back you are reseting something. As someone said earlier these is a PC board somewhere with corrosion on the puns or a leaky diode or a faulty transistor.
You need to isolate the airframe and engine seals and tubing first as that is the easiest
As you know a bleed air leak can cause a lot of damage in a hurry.
Last edited by william_iorg; 05/02/22.
