AIR DATA SYSTEM (ADS) – GENERAL
The two Air Data Systems (ADS 1 and ADS 2) provide:
• Barometric Altitude (BARO)
• Indicated Airspeed (IAS)
• Vertical Speed (VS)
• Outside Air Temperature (OAT)
Air data are also used by:
• AFCS
• AHRS
• FMS
• Weather Radar (if installed)
• TCAS (if installed)
AIR DATA SYSTEM – MAIN COMPONENTS
The ADS main components include
• two Pitot-Static Probes
• two Air Data Modules (ADM 1 and ADM 2)
• two OAT Probes
• two Alternate Static Sources
PITOT STATIC PROBES
Each Pitot-Static Probe is installed on a forward fuselage side in front of
cockpit doors and include:
• one total pressure port
• two static pressure ports
• an electrical heater to prevent ice formation (see chapter 30 00)
A drain hole permits draining any water which has condensed inside the
probe.
AIR DATA MODULE (ADM)
Each ADM is a solid state transducer that converts dynamic and static
pressure values into digital signals used by the MAU to generate air data
parameters such as calibrated airspeed, altitude, vertical speed and OAT.
The Air Data Modules are installed in the nose compartment on the cockpit
bulkhead.
OUTSIDE AIR TEMPERATURE (OAT) PROBES
The two outside air temperature probes sense the temperature of the
external air and are installed in the bottom forward fuselage.
ALTERNATE STATIC SOURCES
The two alternate static sources are static ports located in the overhead
panel: one on the LH sidewall (co-pilot) which is part of ADS 1 and the other
on the RH sidewall (pilot) which is part of ADS 2.
Each port is integral with a lever-type selector valve that can be operated by
the crew. The control is protected by a red guard to prevent inadvertent
actuation.