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Indicates that airplane has arrived at decision height.
During go--around, alert is disabled
at decision height +100 feet.
Alerts inhibited below 5 feet.
Radio Altimeter
Indicates current radio altitude.
Displayed upon descent below 1,225 feet RA.
Vol. 1 12--40--5
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Radio Altimeter System
Flight Crew Operating Manual
CSP A--013
MASTER
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Radio Altimeter
RAD ALT 1 DC BUS 1 1 K7
Altimeter RAD ALT 2 DC BUS 2 2 L1 <0045>
REV 56, Jan 31/03
Vol. 1 12--40--6
FLIGHT INSTRUMENTS
Radio Altimeter System
Flight Crew Operating Manual MASTER
CSP A--013
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Vol. 1 12--50--1
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual
CSP A--013
MASTER
1. ATTITUDE AND HEADING REFERENCE SYSTEM
The attitude and heading reference system (AHRS) is a gyro reference system that
generates angular rate and linear acceleration information about the aircraft axis.
The AHRS is a dual system with two independent attitude and heading computers. Each
computer receives corrected heading information from an individual flux detector which
sense the earth’s magnetic field. Each computer also receives information from the same
side air data system. This information, together with accelerometer sensor data, is
processed and sent to the integrated avionics processor system which interfaces with the
flight control computers and flight management computers.
These signals are also routed to the TCAS, GPWS, weather radar, fuel system, stall
protection system, flight data recorder and data concentrator units.
These signals are also routed to the TCAS, EGPWS, weather radar, fuel system, stall
protection system, flight data recorder and data concentrator units. <0040>
AHRS provides attitude and heading information to the electronic flight instruments. The
PFD’s display AHRS alignment flags during initialization (30 to 70 seconds). If aircraft
primary power is lost, the AHRS will continue to operate on battery bus power for 11
minutes. Attitude is displayed on the attitude direction indicator (ADI) of the primary flight
displays and heading is displayed on the horizontal situation indicator (HSI) portions of the
displays.
AHRS mode selections are made using the pilot or copilot compass control panel. The
AHRS normally operates in magnetic (MAG) mode. Directional gyro (DG) mode is intended
to operate as a heading reference, only for a short period of time, near areas where
magnetic disruptions exist and does not use data from the flux detector.
A slew switch is provided to change heading direction. The switch is operational in both
MAG and DG modes. In DG mode it is used periodically to correct for drift. In MAG mode, it
also causes the heading to slew in the selected direction. When the switch is released in
MAG mode, the heading will slowly slave back to the heading defined by the flux detector.
2. INERTIAL REFERENCE SYSTEM <0025>
The inertial reference system (IRS) provides inertial outputs of attitude, heading, angular
rates, linear acceleration and present position to be displayed on the flight displays and to
be used by other avionics systems.
The IRS is a dual system with two inertial reference units (IRU) and a dual mode select unit
(MSU). Each IRU receives information from the same side air data system. The IRU
measures inertial motion sensed by the inertial instruments and computes attitude and
heading data. This information is processed and sent to the integrated avionics processor
system which interfaces with the flight control computers and flight management computers.
These signals are also routed to the TCAS, EGPWS, weather radar, fuel system, stall
protection system, flight data recorder and data concentrator units. The MSU provides pilot
selection of the IRS modes.
REV 56, Jan 31/03
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FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual MASTER
CSP A--013
The IRS provides attitude and heading information to the electronic flight instruments.
Attitude is displayed on the attitude direction indicator (ADI) of the primary flight displays and
heading is displayed on the horizontal situation indicator (HSI) portions of the displays.
Heading is selected to magnetic or true using the flight management system (refer to
Chapter 18).
The IRS normally operates in navigation mode. In navigation mode, it is not possible to
　
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