A320 WTBs
I was told an interesting little known fact about the Airbus. It seems odd and I have not seen it written anywhere so I do not know the validity of it. Maybe someone could shed some light on it.
Apparently, if you set the clock in flight to beyond 10 days, you cannot deploy during the approach the slats and flaps! Yep you read it right - this got my attention too. The logic seem to be related to the WTBs. The WTBs are supposedly tested at every landing and the test is supposedly valid for a period of 9 days. So if you were to set the date in flight to beyond 9 days, the computer (don't know which one) would interpret this as a need to test the WTBs and would activate them in the process prohibiting the pilots from deploying the slats and flaps during the approach.
Any truth to it ?