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1 IRS
1 ADC
1 RAD
1
Combiner
AP1 FLC
2250
RADIO COMMUNICATIONS BUS
IRS 3 IAC 3 I/O COM
TCAS ADC 3 HUD Computer
EGPWS I/O MON Optical Projector Unit
NAV
2
SPC
2
IAC
2 Channel A
IRS 2 DAU 4 Channel B PFD 0.88 LIM EICAS 1.541.54 1.651.65
CRZ
EPR
ADC 73.3 N1 73.3
2 789 789
RAD 2 FMS1 SRP 23.4NM BARO 3 6 E 12 15S21 24 W 30 33 NDTK 360 0.856M TOTAL FUEL (LBS) 41550 14600 1460010000 2350 ND STAB NU NL RUDDER LWD RWD NR TRIMS 7.2 N2 FF (PPH)OIL TEMP OIL PRESS 93.4 5750 115 81 93.4 5750 115 81 ITT AIL
GF1110_058
Rev 5, Jul 21, 2005 Flight Crew Operating Manual Volume 2
FLIGHT INSTRUMENTS
HEAD-UP DISPLAY SYSTEM (HUD) (CONT'D)
Head-Up Display Computer
The HUD Computer is mounted in the avionics bay and interfaces with the airplanes avionic and electrical systems. 28 VDC is supplied to the HUD Computer from the DC BUS 2 via the EMS CDU and is controlled by the HUD BRT/DIM knob located on the glareshield. The HUD Computer computes the position, value and brightness of symbols.
The computer is composed of two independent computation channels (COMmand) and (MONitor)
The COM channel performs the following:
.
Input/Output (I/O) Processing . performs acquisition and validation of avionics data and sensor selection consistent with PFD and data comparison.
.
Symbology Computation . performs automatic Mode management (based on airplane flight configuration), confirms the presence or absence of each symbol and position of the displayed symbols.
.
Display Generation . generates deflection and blanking signals.
The MON channel performs the following:
.
Input/Output (I/O) Processing . performs acquisition and validation of avionics data and sensor selection consistent with PFD and data comparison.
.
Display Monitoring . monitors symbols position, numerical readout value and presence, verification of deflection signals of 3 referenced points and compares the current value with a theoretical value.
.
COU Monitoring . monitors the operational position based on infra-red emission by the OPU and the reflection on a mirror located on the combiner.
.
Built in Test . verifies the functionality and integrity of the system.
The acquisition module monitors the following data:
.
Attitude (Pitch and Roll angle)
.
Magnetic heading
.
Computed airspeed
.
Baro altitude
.
Radio Altitude
.
Localizer deviation (via IAC)
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