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Attitude reference.
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Air speed and altitude trend vector (on PFDs).
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Alerts (pre-selected on flight level 180).
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Static source error correction.
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Maximum speed values (Vmo at all altitudes and Mmo at a constant).
. Overspeed warning (present airspeed and Vmo). The reversion control panel, located on the pedestal, is used for pilot input to the air data system.
reversion on
PFD Annunciation
Pilot’s Side
Normally fed as follows:
ADC 1 . if reverted then,
ADC 3 . if reverted then,
ADC 2.
ADC Source Annunciation
ADC 2 . if reverted then,
ADC 3 . if reverted then,
ADC 1.
GF1110_007
Volume 2 Flight Crew Operating Manual Rev 5, Jul 21, 2005
The Inertial Reference System (IRS) provides attitude, directional, position and 3-axis rate/accelerometer data to the following airplane systems:
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PFDs and MFDs . Stall protection system
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Weather radar system . Fuel system
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AFCS . Flight data recorder
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EGPWS . Air data computer
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TCAS . FMS
Each IRS computer (IRS 1, IRS 2, IRS 3) receives true airspeed and altitude from the applicable (on-side, either left or right side) air data system. In the event of a failure of the on-side air data input, the off-side input is automatically selected.
The IRS mode select panel, located on the pedestal, is used to initialize the IRS and to select NAV or ATT modes.
ATT . Reversionary mode, used to provide
IRS Mode selector Panel
attitude information, in the event of
NAV mode failure.
NOTE
During IRS initialization the PFD is in a failure mode.
GF1110_009
Rev 5, Jul 21, 2005 Flight Crew Operating Manual Volume 2
FLIGHT INSTRUMENTS
INERTIAL REFERENCE SYSTEM (CONT'D)
At an IRS internal temperature between .54°C and .40°C, the power supply will turn on, but normal alignment will not start until IRS temperature is >.40°C. The IRS will not go to NAV mode until the internal temperature of IRS reaches .15°C
LOW TEMPERATURE ALIGNMENT
IRS Internal Temperature (° C) Time to Complete Alignment (min.)
<.12.5 16
.12.5 to .10.0 15
.10.0 to .7.5 14
.7.5 to .5.0 13
.5.0 to .2.5 12
.2.5 to 0 11
> 0 7
Inertial reference accuracies are achieved for alignments between ± 78° of latitude. The IRS requires that the initial position be entered from either flight management system (FMS) control display unit (CDU) via the POS INIT page.
The reversion control panel, located on the pedestal, is used for pilot reversion of the IRS and PFD.
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