Pressurisation Systems

[DDG]

Hi subsidence,

You will have to provide a bit more info to get a good response.What aircraft is the system fitted to?

As an example,
A B737NG pressurization control can be automatic or manual.
There are two digital cbain pressure controllers(cpc`s).Each CPC has its own systems interface and outflow valve motor system.This gives the AUTO mode of control a Dual redundant architecture.Only one CPC controls the outflow valve at any time.The other CPC is a backup.The active controller changes for every flight or when there is an AUTOFAIL event.
The manual control mode overrides and bypasses the two CPC`s.The manual control system has its own valve motor system.This gives the pressurization control system a triple redundant architecture.

Late model B737 Classic`s are similar.
Early model B737 Classic`s use a very different analog systems.

Regards DDG