Eclipse 500 System Manual page 305

Section 13. Air Data
13.6 Normal Operations
The Air Data System requires no pilot action during normal operation. All pitot/static
probes/ports are automatically heated. The ACS provides power to the probe and
static port heaters when either of the engines is running or there is no weight on
wheels.
Electrical control of the Air Data System is accomplished through the ACS. Power for
each probe is provided by an Electronic Circuit Breakers (ECBs). Power for the
pitot/AOA probe and static port heat are also provided by ECB's. In the event of
failure of one ADC, the pilot is able to switch to the other air data source using the
SENSOR synoptic page.
The pitot/AOA probes provide pressure to the ADC. The computers use pressure
data from the pitot/AOA probes and static air pressure from the static ports to
determine airspeed, Mach, and total pressure. The ADC uses air temperature from
the OATs to determine airspeed, Mach, and air temperature, and present the data on
the PFD. This information is also used by the ACS for comparison and failure
monitoring and by the FADEC for engine control.
Angle-Of-Attack data is derived from the pitot/AOA probes and transmitted to the
ADC where differential air pressure data is converted to angle-of-attack data. It is
combined with other air data information and sent to the PFD and ACS for use by the
stall protection system.
To determine aircraft altitude the ADC uses static air pressure data from the dual
static ports to determine altitude and vertical speed. The ADC relays this information
to the PFDs, ACS and FADECs.
OAT information is also transmitted to the ADC and ACS by two OAT probes located
on the vertical stabilizer fairing. The air data computers interpret the data provided,
and present temperature for display on the PFDs and MFDs. OAT information is also
used by the ACS to provide the FADEC with Total Air Temperature (TAT) for engine
control.
Version 2.0 April 2007
Copyright © — Eclipse Aviation Corporation
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