Originally Posted by Bearfoil
Why is "USE MANUAL TRIM ONLY" (I have no quote function, so if I misquote you, please understand). "Big Trouble". ? Why is this TRIM only for Pitch control?
iF EFCS is inop, and mechanical back up only, are you saying the elevators are inop also? Pitch must be managed by Trim Wheel alone?
When "USE MANUAL TRIM ONLY" appears on the PFD, you are effectively in big trouble as, either you have lost both elevators (L+R) or EFCS is not powered anymore (see basic schematic posted above about flight controls). They could be other failures but I'm just pointing that in order to illustrate that what is related to critical F/C faults should be displayed on the PFD directly to the PF without the need to wait further for PNF ECAM troubleshooting sequence.
Beside, the correct wording is USE MAN PITCH TRIM, displayed in amber, while MAN PITCH TRIM ONLY, is displayed in red. See below:
