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These flight instruments are powered by the
standby instrument battery pack:
• Airspeed indicator
• Altimeter
• Attitude indicator
AIR DATA REFERENCE
SENSORS
Outside air data is supplied to the Mustang
avionics (air data computer and standby instruments)
through dual pitot-static systems, dual
outside-air probes and a stall-warning vane.
Two pitot probes, one on each side of the nose,
supply ram-air inputs to the respective side
(pilot/left or copilot/right) air data computer
(ADC). A separate, two-port static system
connects to each ADC. To minimize yaw effects,
both static systems have a static port on
each side of the fuselage.
All four static ports and both pitot tubes are electrically
heated whenever the PITOT-STATIC
switch (in the ICE PROTECTION switch panel)
is on. To ensure continued air data reference if
normal DC power fails in icing conditions, the
pilot pitot-static system is electrically heated
through the emergency bus (refer to Chapter
10—“Ice and Rain Protection”).
Two outside air temperature (OAT) probes
are on the left fairing below the cabin door
(one for each ADC). The ADCs analyze OAT
levels and pitot-static inputs, and convert the
information to data for the other components
and displays of the G1000.
However, the standby altimeter and air data
displays bypass the ADCs and receive reference
inputs (static and ram-air pressures) directly
from the pilot-side pitot-static system.
16-4 510OM-00
CITATION MUSTANG OPERATING MANUAL
The stall-warning computer processes signals
from the stall-warning vane (on the copilot side
of the fuselage). The stall warning computer
sends normalized angle of attack (AOA) to the
G1000 to display a reference approach cue
speed, 1.3 VS1, represented as an open green circle
on the airspeed tape. A red low-speed awareness
range extends from the bottom of the
airspeed tape up to the low speed velocity,VLSA.
The stall warning computer also sends an impending
stall signal to disconnect the autopilot
(AP). An aural stall warning tone is heard in the
speakers and headsets when airspeed is below
VLSA. The stall warning system also provides
three crew alerting system (CAS) messages:
STALL WARN FAIL, STALL WARN HTR, and
STALL WARN HI. The STALL WARN HI message
appears when the stall warning system is
operating on the ice-contaminated schedule
(refer to Chapter 10—“Ice and Rain Protection”
for more details).
G1000 ARCHITECTURE
The G1000 is a system of individual line-replaceable
units (LRUs), which integrate into
a modular avionics system that provides:
• Flight instrumentation
• Navigation and hazard avoidance
• Flight guidance
• Communications
• Monitoring of aircraft systems
The pilot and copilot monitor and operate the
instruments and avionics, and some aircraft
systems, through the displays and control panels
(Figure 16-2 and Table 16-1).
The G1000 provides system redundancy
through the use of dual, parallel systems (one
for pilot and one for copilot), with cross-side
connections to provide maximum capability to
both sides, and to ensure system redundancy
if a failure occurs. Any one of the three displays
is capable of displaying all critical flight
information (upon pilot command or automatically)
in the event of a display failure.
DATA COMMUNICATIONS
LRUs communicate with each other through
various types of data communication lines.
Refer to Figure 16-2 for an interface diagram.
GARMIN INTEGRATED
AVIONICS UNITS
The G1000 is regulated and coordinated by
central processing computers in the two
Garmin integrated avionics units (GIAs),
which also contain the essential navigation
and communications avionics:
• NAV/COM
• Instrument landing system (ILS)
• Global positioning system (GPS)
• Flight director (FD)
Each GIA receives additional information from
its onside ADC and attitude and heading reference
system (AHRS). Finally, each GIA monitors
engine/airframe sensors directly, or through
Garmin engine/airframe (GEA) interface units.
All outputs from the GIAs are displayed on the
PFDs and/or MFD. In addition to the main
processors, specific features include:
• Wide-area augmentation system
(WAAS)-enabled, 12-channel parallel
GPS receiver (simultaneously tracks and
uses up to 12 satellites).
• Very high frequency communication
(VHF COM) transmitter providing frequencies
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