Auto Trip and Standby Check

[Jens W.]

Hi,

today I tried the "Auto Trip and Standby Check" from the Supplementary Procedures. At the point "Pressurization mode selector .... Check" the AUTO FAIL and STANDBY light illuminates correctly but the outflow valve does not move from the close to the open position as expected.

@Jan: Did I miss something or it is a bug?

Thanks!

Jens

[Litjan]

Hi Jens,

I looked at the procedure myself (didn´t even know it existed) and I really don´t see why the Auto mode should trip when the outflow valve moves from close to open after moving the FLT/GRD switch to flight. The plane isn´t pressurized in the first place (packs are off), so opening and closing the outflow valve would cause zero change in the cabin pressure and therefore no "excessive rate" signal to the controller.

That being said I must also add that we don´t model the cabin pressure controller down to the last diode, so it is quite possible that there are some test modes or fault detection logics that we don´t model.

Thanks for the feedback, Jan