NG Upper DU/Lower DU
Pushing the ENG switch will only bring up the compressed Eng parametrs on the Upper DU on initial power up. Any subsequent selection of the ENG switch will remove the compressed parameters. The only other method is to pull the Lower DU circuit breaker, in order to simulate a failure of the lower DU, but why would you want to do that? Some operators have their displays configured to display all the parameters on the Upper DU. Very cluttered. You will see an example of the cluttered DU on the generic "Paper Tiger".