Hello mm43,
Thank you for keeping updated the Seabed Explorer positions.
Originally Posted by mm43
Further examination leads me to believe that should barometric data not be available from ADIRUs 1, 2 or 3, then the Captains static baro is supplied via the FMGC.
FMGC doesn't supply air data to the controller but only flight plan related data: altitude at departure, altitude at landing, altitude at cruise, etc. in order to calculate the various cabin altitude regulation adjusted in time with the flight plan. On the other hand, what is mentioned is that the controller will use Captain ADIRS (ADIRU 1). "Captains static baro" is displayed by ADIRU 1 which is either ON or OFF (no separation is made from the components of Air Data (AD) part of each ADIRU, only Inertial Reference (IR) part may be separated if AD part fails.
MAIN COMPONENTS
Cabin Pressure Controllers:
Two indentical, independent, automatic controller are used for cabin pressure control. They recieve signals from the Air Data Inertial Reference System (ADIRS), the Flight Management and Guidance Computer (FMGC), the Engine Interface Unit (EIU), the Landing Gear Control Interface Unit (LGCIU), the Proximity Switch Control Unit (PSCU), and the pack flow control valves. They perform the automatic cabin pressure control. They generate signals for the ECAM. In automatic mode, each controller had a backup section, which is powered by an independent power supply in the controller No.1 position. This selection also has a pressure sensor that generates the cabin altitude and pressure signal for the ECAM, when MAN mode is selected. The controllers communicate via a cross-channel link.
SYSTEM OPERATION
Automatic Pressure Control Mode:
- The controller normally uses the landing elevation and the QNH from the FMGC, and the pressure altitude from the ADIRS. If FMGC data are unavailable, the controller uses Captain Baro Reference from the ADIRS and the LDG ELEV selection.