Systems Guide

A318/A319/A320/A321
Professional
SYSTEMS
Systems guide
Vol
4
04-03-56
11 July 2018
MASTER CAUTION, MASTER WARNING & AUTOLAND WARNING
The MASTER WARN pb and MASTER CAUT pb alert the pilot to a problem in one of the systems or an
unsafe condition. The MASTER WARN pb is accompanied by a continuous chime while the MASTER CAUT
pb only sounds a single chime. When pushed the caution and warning system is reset.
NAVIGATION
The navigation system has the following main components
• Navigation receivers
• Radar altimeter, transponders
• Two ADIRS
• Two FMGCs
Pilot interaction with these system uses:
• Multifunction Control and Display Units (MCDUs),
• Flight Control Unit (FCU)
• Transponder control panels
• ADIRS control panel
• Radio Management Panels (RMPs)
ADIRS
The Air Data Inertial
Reference System supplies
data such as barometric
altitude, speed, angle of
attack, temperature,
attitude, track, heading,
acceleration and aircraft
position. The Inertial
Reference System uses three
separate units to determine
its position, and these have
to be aligned before the
aircraft is moved.
• The ON BAT light will be illuminated when one or more IRS is supplied only by the aircraft
battery; it will also light up for a short while at the beginning of alignment.
• The IR pb sw will display OFF when the system is not connected to the other systems and FAULT
when the when IRS alignment is lost.
• The three rotary mode selectors will switch between OFF, NAV (normal mode or operation) and
ATT (not simulated).
• The ADR pb sw can be pushed to disconnect one or more of the systems (OFF) and will display
FAULT when the ECAM systems detected a fault in the Air Data Reference data.
Note: There are differences in setup of ADIRS systems between models and even airlines, this also means
there are slight differences in how the ADIRS is being used.