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magnetometers are in the vertical tail to minimize
magnetic influence from aircraft structures
and contents.
Air Data Computer
Each GDC 74B air data computer (ADC1 for
pilot, ADC2 for copilot) is a remote-mounted
device that provides air data to the GIAs and
the PFDs, including:
• Air temperature
• Pressure altitude
• Density altitude
• Vertical speed
• Indicated airspeed
• True airspeed
• Mach number
Each ADC measures aircraft static and impact
pressure information from pressure transducers
connected to the same-side (pilot or
copilot) pitot-static system and raw air temperature
data from its own outside temperature
probe. Using the raw data, each ADC unit
computes the air data values, then sends them
to its corresponding GIA and PFD. The system
is reduced vertical separation minimum
(RVSM) compliant. Each ADC also communicates
with the AHRS to provide stabilization
and orientation information.
Engine/Airframe Interface Unit
Each GEA 71 interface unit is a computer that
monitors analog and discrete (digital) sensors
on airframe and engine systems, and translates
these into system indications and alerting outputs
to the GIAs. Each GEA interface unit supplies
information to both GIAs. The GIAs
process this information further, and distribute
it to other systems, particularly to the engine indicating
and crew alerting system (EICAS) display
(normally presented on the MFD).
FMS and MFD Controller
A flight management system (FMS) is integrated
into the processors for the displays and
GIAs. The system is controlled with the the
GCU 475 FMS and MFD controller, which
is on the cockpit pedestal below the throttles.
The FMS controller also duplicates many of
the functions of comparable controls on the
PFDs when used to control settings and displays
on the MFD.
Automatic Flight Control
System
The Mustang has a GFC700 AFCS.
The system functions are distributed across
various units:
• The AFCS controller is under the center
glareshield and has the mode-select
buttons.
• Each GIA performs mode logic and FD
computations.
• The servos compute and monitor for the
AP, yaw damper (YD), auto trim and
manual electric pitch trim functions.
• The PFDs display FD commands and
mode annunciations.
Yoke-mounted and throttle-mounted switches
complete the system control inputs:
• CWS switch
• AP DISC switch
• GA switch
GTX33 Mode S Transponder
and GTX33D Mode S Diversity
Transponder
The G1000 includes two transponders: A GTX
33 Mode S transponder for the copilot side, and
a GTX 33D Mode S diversity transponder for
the pilot side. Each transponder connects
(through its same-side GIA) to the PFDs for
control and display.
Both transponders provide mode A (normal),
mode C (altitude encoding) and mode S (data
communications) functions. The GTX 33D
provides diversity capability.
Both transponders are automated transceivers
operating on radar frequencies, receiving
16-8 510OM-00
CITATION MUSTANG OPERATING MANUAL
ground radar and traffic alert and collision
avoidance system (TCAS) interrogations at
1030 MHz, then transmitting a coded response
to ground-based radar at 1090 MHz.
Ground stations can interrogate mode S
transponders individually using a 24-bit
International Civil Aviation Organization
(ICAO) mode S address, which is unique to the
particular aircraft. In addition, ground stations
may interrogate a GTX 33 for its
transponder data capability and the aircraft
flight identification, which is the registration
number or other call sign. The GTX 33 makes
the maximum airspeed capability (set during
configuration setup) available to TCAS systems
on board nearby aircraft to aid in the determination
of TCAS advisories.
The unit includes an altitude monitor and
traffic information service (TIS). Altitude
and traffic alerts are announced by a voice
or tone audio output. The PFD displays the
code, reply indication, and operating mode.
The MFD displays TIS graphical information,
which may also appear in the PFD inset
map. A traffic alert causes the PFD inset
maps to automatically appear.
Audio/Marker Beacon System
The GMA 1347D audio amplifier and marker
beacon receiver is a panel-mounted system.
The unit has a microcontroller for processing
front panel key commands, annunciator control,
input/output functions, and communication.
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