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knots will cause the IAS indicator to display. Airspeed indication tolerances are
shown in the table that follows:
Airspeed (Knots) Indicator Tolerances
(Knots)
Difference Between
Left and Right
Indications (Knots)
ISI Tolerances (Knots)
60 ±5 ±3 ±5
80 ±3 ±3 ±4
100 ±3 ±3 ±3
120 ±3 ±3 ±3
140 ±3 ±3 ±3
160 ±3 ±3 ±3
180 ±3 ±3 ±5
200 ±3 ±3 ±5
260 ±3 ±3 ±5
300 ±3 ±5 ±5
360 ±3 ±5 ±6
Altitude (ALT) --- An ALT difference of > .002 X ABS (ALT1 + ALT2) will cause the
ALT indicator to display. Altitude indication tolerances are shown in the table that
follows:
Vol. 1 12--20--9
FLIGHT INSTRUMENTS
Electronic Flight Instrument System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
NOTE
The following tables show comparator tolerances and
should not be confused with operational tolerances.
D. Non RVSM Table
ALTITUDE (Feet) PFD 1 and PFD 2
Tolerance ( Feet)
ISI Tolerance (Feet) The ALT comparator
flashes when the
altitude difference
between the PFD’s
exceed (Feet)
--1000 ±20 ±20 64
0 ±20 ±20 60
1000 ±20 ±20 64
5000 ±31 ±30 77
10000 ±38 ±50 103
15000 ±54 ±60 130
20000 ±62 ±75 186
25000 ±72 ±100 203
30000 ±82 ±120 220
41000 ±110 ±153 238
E. RVSM Table
ALTITUDE (Feet) PFD 1 and PFD 2
Tolerance ( Feet)
ISI Tolerance (Feet) The ALT comparator
flashes when the
altitude difference
between the PFD’s
exceed (Feet)
--1000 ±20 ±20 64
0 ±20 ±20 60
1000 ±20 ±20 64
4000 ±27 ±30 77
10000 ±30 ±50 103
16000 ±32 ±65 130
22000 ±32 ±85 155
29000 ±32 ±110 186
33000 ±32 ±130 203
37000 ±32 ±140 220
41000 ±32 ±153 238
Vol. 1 12--20--10
FLIGHT INSTRUMENTS
Electronic Flight Instrument System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
EFIS Abnormal Indications <1001, 1015>
Figure 12---20---8
EFIS COMP INOP caution (amber)
Indicates that comparator information
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.
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Primary Page
Vol. 1 12--20--11
FLIGHT INSTRUMENTS
Electronic Flight Instrument System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
F. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Pilot’s Flight PFD 1 V10
Instruments MFD 1 V11
Electronic
Dimming
Control
EFIS CRT
DIMMING
DC
ESSENTIAL U4
Flight
Instruments Display
EFIS CONT
PNL 1 2 U7
Control Panels EFIS CONT
PNL 2
DC BUS 2
K3
Copilot’s Flight PFD 2 K1
Instruments MFD 2 K2
Vol. 1 12--20--12
FLIGHT INSTRUMENTS
Electronic Flight Instrument System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE IS INTENTIONALLY LEFT BLANK
Vol. 1 12--30--1
FLIGHT INSTRUMENTS
Air Data System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
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 03--20--01).
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