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A. Pitot Static System
The pitot static system supplies pitot and static air pressures to the ADCs, the
integrated standby instrument (ISI) and the cabin pressure control panel (CPCP). The
system consists of two pitot/static probes, an alternate pitot probe, alternate static ports
and a total air temperature probe (TAT).
Each pitot static probe consists of a pitot mast and two static ports. Pitot pressure from
each probe is supplied to the same side ADC. Static pressure from each probe is
supplied to each ADC.
The alternate pitot probe and static ports supply pressure inputs to the integrated
standby instrument (ISI).
Electric heating elements protect the pitot-static and TAT probes from icing (refer to
Chapter 15, Ice and Rain Protection).
NOTE
TAT probe readings are inaccurate when the aircraft is on the
ground, due to probe heating to protect it from icing. TAT probe
readings cannot be used to obtain the ambient static
temperature before take-off.
Vol. 1 12--30--2
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Pitot Static System --- General
Figure 12---30---1
RIGHT PITOT--STATIC PROBE
LEFT PITOT--STATIC PROBE
ALTERNATE PITOT TUBE
TOTAL AIR TEMPERATURE PROBE
ALTERNATE STATIC PORT
ALTERNATE STATIC PORT
Vol. 1 12--30--3
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Air Data System (ADS)
Figure 12---30---2
S1
S2
P1
LEFT PITOT/
STATIC PROBE
ADC 1
ARP 1
TAT
P2
S2
S1
RIGHT PITOT/
STATIC PROBE
ADC 2
ARP 2
Vol. 1 12--30--4
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
B. Air Data
The air data system provides the following air data parameters:
S Pressure altitude (corrected for static pressure errors)
S Vertical speed
S Calibrated and indicated airspeed (CAS / IAS)
S Mach number
S True airspeed
S Static air temperature (SAT)
S Total air temperature (TAT)
S Temperature variations from international standard atmosphere (ISA)
In addition to the above parameters, the air data system computes and controls the
following reference values and parameters:
S Preselect altitude
S Airspeed trend vector
S Maximum allowable speed (VMO)
S Maximum allowable Mach (MMO)
S Baro corrected value
S Vertical speed references
Vol. 1 12--30--5
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Air Data System --- Block Diagram
Figure 12---30---3
APU ECU
DCU 2
SSCU 2
P1
S1 LEFT RIGHT
P2
S1
CROSS--TALK
PITOT STATIC PROBES
TAT PROBE
ALT ALRT
OVSPD
ALT ALRT
DCU 1 OVSPD
LEFT RIGHT
IAPS
PRESSURE
CONTROLLER
1
28 VDC
ESS BUS PFD 2
MFD 2
PFD 1
MFD 1
GPWS
PRESSURE
CONTROLLER
2
28 VDC
BUS 2
ADC 2
FLIGHT CONTROL PANEL
AIR
DATA
REF
PANEL
1
STALL
COMPUTER
IAPS
PFD 1
MFD 1
PFD 2
MFD 2
GPWS
STALL
COMPUTER
IAPS
SSCU 1
ADC 1
CBP2--V3 CBP2--H6
AIR
DATA
REF
PANEL
1
S2
S2
OVSPD
TEST SW
ADC 1 ADC 2
Vol. 1 12--30--6
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
C. Air Data Reference Panels
The air data reference panels (ARP) are located on the pilot’s and copilot’s side panels.
Each ARP is used to enable selection of airspeed reference pointers and barometric
correction for altitude.
Each ARP functions with the same-side ADC, display control panel, primary flight
display and multifunctional display. The ARP is divided into three sections:
S The speed references section is used to select and input changes to the various
target and speed settings (V1, VR, V2 and VT). Both PFDs will display the same
values.
S The altitude references section is used to set minimum descent altitude (MDA) and
decision height (DH) values and to initiate radio altimeter self test.
S The barometric reference section is used to:
S select and inputchanges to the ADC barometric pressure.
S select indicating units (hPa or inHg).
S set standard barometric pressure.
S Each PFD can have a different barometric pressure setting. The last value selected
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