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NORM ALTN NORM ALTN1ALTN2 NORMALTN
ALTN3
PFD1 EICAS PFD2
PFD1 PFD2
IRS ADC ADC IRS
NORM ALTN NORM ALTN NORM ALTN
IRS 1 . if reverted then,
IRS 3 . if reverted then, SG1 SG3 SG2
IRS 2.
IRS 2 . if reverted then,
IRS 3 . if reverted then,
IRS 1.
GF1110_011
Volume 2 Flight Crew Operating Manual Rev 5, Jul 21, 2005
INERTIAL REFERENCE SYSTEM (CONT'D)
The reversionary attitude mode, which provides attitude, heading, rate and acceleration data, but not position data, may be selected when navigation mode is not available. This condition may occur in the air, following a power interrupt or transient system fault. Attitude alignment takes 1 minute from power off to ATT mode or 34 seconds from NAV to ATT mode, provided the airplane is stationary on the ground or in straight and level flight. If excessive motion is detected, the attitude alignment is run for an additional 20 seconds. Once attitude alignment is complete, heading is entered from the FMS. Heading entries may be made, while the IRS is in the attitude mode, to correct for heading drift.
Rapid re-alignment is possible, once the IRS is in navigation mode, by selecting the NAV/ATT switch from NAV to OFF and back to NAV within 0.2 to 5 seconds. Velocity errors are corrected and tilt errors are removed to correct the pitch and roll angles. The total rapid re-alignment time is 32 seconds. Present position is required to be re-entered.
NOTE
During flight, navigation reference is lost if the mode select switch is set away from NAV.
Rev 5, Jul 21, 2005 Flight Crew Operating Manual Volume 2
FLIGHT INSTRUMENTS
INERTIAL REFERENCE SYSTEM (CONT'D)
NOTE
IRS will not restart or re-align on airplane battery bus power. If airplane primary power is lost, IRS can continue to operate on airplane battery bus power.
GF1110_012
Volume 2 Flight Crew Operating Manual Rev 5, Jul 21, 2005
PFD 1 and PFD 2 are digital CRT-based versions of the traditional (analog/mechanical) flight instruments. Input to the PFDs is derived from the ADCs and IRS units selected, and commands set on flight control panel, air data reference panel and the DCPs. The PFDs function as the following flight instruments:
.
Attitude Director Indicator (ADI) . Radio altimeter indicator
.
Horizontal Situation Indicator (HSI) . Airspeed indicator (Mach and IAS)
.
Radio Magnetic Indicator (RMI) . Vertical Speed Indicator (VSI)
.
Altitude Indication
The PFDs are the mode annunciator panel for flight director and autopilot (above the ADI display). They also provide messages and cues for windshear alerts (on the ADI) and TCAS traffic alerts and commands (on the VSI).
PRIMARY FLIGHT DISPLAY
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