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Temperature (SAT) and the True Airspeed (TAS)/Mach number. This information is
displayed on the Primary Flight Displays (PFDs) and Multifunction Displays (MFDs).
Ice Protection is provided by electric heating elements.
Air Data Computers (ADCs)
The ADCs are digital, microprocessor-controlled units. The two ADCs receive on-side
pitot and static air pressure information from the pitot-static system and air
temperature information from the TAT probe.
The ADCs also receive operator/display selected input from the ADRPs and the
Automatic Flight Control System (AFCS). From these inputs, the ADC calculates all
necessary air data parameters and transmits the information to the applicable systems.
Air Data Calculations
The ADC calculates air data parameters for the following:
• Pressure altitude (corrected for static-port pressure errors)
• Barometric corrected altitude (inches of mercury or hectopascals)
• Vertical Speed
• Indicated airspeed (IAS)/Calibrated airspeed (CAS)
• Mach number
• Maximum airspeed (VMO/MMO)
• True airspeed (TAS)
• Static air temperature (SAT)
• Total air temperature (TAT)
Air Data Computations
The ADC computes data for the following:
• Preselect altitude
• Vertical speed reference
• Airspeed reference
• Mach reference
• IAS trend vector
• Secondary speed reference (V1, VR, V2 and VT)
• Flap overspeed limits (231, 197 and 189 Kts)
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-15
P I LOT T R A I N I N G GU I D E
Air Data Transmission
The ADC sends the computed air data to the following systems and components:
• Flight Data Recorder (FDR)
• Radio Tuning Unit (RTU)
• Mode S Transponder
• Traffic Alert and Collision Avoidance System (TCAS)
• Primary Flight Display (PFD)/Multifunction Display (MFD)
• AFCS
• IRSs
• DCUs
• Ground Proximity Warning System (GPWS)
• Horizontal Stabilizer Trim Control Unit (HSTCU)
• Stall protection computer
• Flap Electronic Control Unit (FECU)
FLIGHT INSTRUMENTS
11-16 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Controls and Indicators
Display Control Panel
The DCP provides the pilot and copilot with the controls needed to select the desired
navigational features of the EFIS system. For the PFDs, this includes lateral and
vertical navigation source information and bearing pointers. For the MFDs, this
includes the format, range and display overlays. Each MFD/PFD pair has a dedicated
DCP. If one of the DCPs should fail, the other DCP may be used to control both EFIS
displays.
Format/Range Knob
Turning the (outer) FORMAT knob selects a desired on-side MFD display format for
the associated MFD. There are five selectable display formats: HSI, NAV Sector, FMS
Map, Plan Map and TCAS. The (inner) RANGE knob varies the display range scale
on the MFD.
Navigation Source Knob
The NAV SOURCE knob selects the active navigation source. This action controls the
selection of displayed information on each pilot’s PFD/MFD. Possible selections are
FMS 1, VOR 1, (or LOC 1), VOR 2 (or LOC 2) FMS 2 and FMS 3. Pushing the center
of the knob alternately adds or removes cross-side NAV data on the MFD HSI and
NAV sector displays only.
Bearing Pointers
The single-bar BRG pointer selects the No. 1 Bearing pointer for each pilot’s PFD/
MFD. Possible selections are VOR 1, ADF 1, FMS 1, and FMS 3 (if installed). The
double-bar BRG pointer selects the No. 2 Bearing pointer for each pilot’s PFD/MFD.
Possible selections are VOR 2, ADF 2, FMS 2, and FMS 3 (if installed).
Information Overlay Buttons
The WX button selects weather radar and lightning detection system depictions on the
MFD. This button sequentially selects weather radar information, or adds radar/
lightning overlays. The Weather Radar is available on all dynamic map MFD formats,
but is not available for HSI and Plan Map. The TFC button alternately selects or
deselects the TCAS Traffic Map Overlay display on the associated MFD. The TERR
button selects the terrain information and replaces the Weather Radar information. For
more details about terrain overlay information, see the EGPWS section in Chapter 17
Navigation Systems.
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-17
P I LOT T R A I N I N G GU I D E
Display Control Panel
Figure 11-9
NAV
SOURCE
FORMAT RANGE
BRG TERR WX TFC
P
USH
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