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for one or both PFDs is not available.
EFIS COMP MON caution (amber)
Indicates that a comparator
miscompare has been detected.
Comparator Warnings (amber)
Indicate that a comparator
miscompare has been detected.
<0015>
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Primary Page
<0006>
<0039>
EFIS COMP INOP
EFIS COMP MON
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FLIGHT INSTRUMENTS
Electronic Flight Instrument System
Flight Crew Operating Manual
CSP A--013
MASTER
C. Comparator Function
A comparison of displayed data is performed by each PFD to ensure that the same
data is shown on both PFDs. Comparison of roll, pitch, heading, altitude and airspeed
information is performed continuously. Comparison for radio altitude, flight director
pitch, ILS localizer and ILS glide slope are performed during precision landing. When a
miscompare condition is detected, the miscompare indicator on both PFDs will flash
amber for 5 seconds then come on steady, as long as the miscompare exists. An EFIS
COMP MON caution message is also displayed on the EICAS primary page.
D. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Pilot’s Flight
Instruments
PFD 1 D10
MFD 1
DC ESS 4
D11
Electronic
Flight
I t t
Control Panel EFIS CONT
PNL 1
C9
g
Instruments
Copilot’s Flight PFD 2 K1
Instruments MFD 2
DC BUS 2 2
K2
Control Panel EFIS CONT
K3
PNL 2
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FLIGHT INSTRUMENTS
Electronic Flight Instrument System
Flight Crew Operating Manual MASTER
CSP A--013
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FLIGHT INSTRUMENTS
Air Data System
Flight Crew Operating Manual
CSP A--013
MASTER
1. AIR DATA SYSTEM
Two air data computers (ADC 1 and ADC 2) provide the primary flight displays (PFD) with air
data consisting of airspeed, altitude and vertical speed. The ADCs also provide computed
air data (speed, altitude and temperature data) to various aircraft avionics systems. The
ADCs convert pitot and static air pressure to electrical signals. The ADCs use static
pressure to produce the altitude data and combine static and pitot pressure to produce the
airspeed data. Resistance changes from a total air temperature (TAT) probe provide the
ADCs with temperature data. The system is controlled by the air data reference panels and
has warning and alert capabilities integrated with the EICAS. Selected speeds and altitude
are set using the flight control panel (refer to Chapter 3).
A. Pitot Static System
The pitot static system supplies pitot and static air pressures to the ADCs, the standby
altitude/attitude/airspeed indicator 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).
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).<0083>
The pilots and copilots pitot static probes each consist of a pitot mast (P1 and P2) and
two static ports (S1 and S2). 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 (P3) supplies pressure inputs to the standby
altitude/attitude/airspeed indicator.
The alternate pitot probe (P3) supplies pressure inputs to the integrated standby
instrument (ISI).<0083>
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.
Two Mach transducers supply primary Mach compensation data to the stall protection
computer. The transducers are connected to the left and right pitot static system and
provide a means of isolating a leaky transducer from the rest of the pitot static system.
via the static source selectors. The selectors are controlled by mechanical selectors on
the pilot’s and copilot’s side consoles.
REV 56, Jan 31/03
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