Originally Posted by DW
I think Dani summed it up pretty well:
To the contrary I'm afraid
Dani is making some stuff up :
"It is strongly recommended that you never use the bird in case of unreliable instruments."
belongs to him, not to the FCOM.
As quoted, the
FCOM is far less restrictive :
"If remaining altitude indication is unreliable:
Do not use FPV and/or V/S, which are affected."
Something of interest,
Airfrance FCTM even recommends its use :
It must be noticed that, if the altitude information is unreliable, FPV and V/S are also affected. In this case, the GPS altitude, if available, is the only means to confirm when the aircraft is maintaining a level. When reliable, the FPV should be used.
I'm inclined to think that if a hypothetical pilot tried to trim, required that trim for an escape maneouvre and the control logic stopped them from recovering, that Airbus would be coming in for all kinds of abuse.
Sorry
Dozy, As I'm not sure to well understand that one, would you rephrase it for me, please ?