Originally Posted by
stankou
hi
Ask your pilot to turn full hot on temp during flight and let you know if press is stab.
No so easy to check on ground. If there is a difference between cold and hot, that means you have a bad ACM; maybe still running but not at constant speed, creating fluctuation on press system.
cheers.
We had this same issue, we changed the ACM. When I pulled out the ACM the turbine was seized up.... funny that this is not in the troubleshooting guide!
Funny thing is no one believed me when I said the acm was bad.... until I pulled it out and showed them the thing was seized up!
Also discovered that removing the plenum on the aft side allows enough access to see if the turbine is seized up via rotating the heat exchanger fan.