MD-11 Flight Crew Operations Manual
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Instrumentation and Navigation -
Description and Operation
Inst.10.10
•IRUs
•FADEC
• ATC transponders.
•CAWS.
• GPWS.
• Cabin Pressure Controllers (CPC).
Standby Altimeter/Airspeed Indicator
A standby altimeter/airspeed indicator is installed on the standby instrument panel
below the GEAR lever. The standby altimeter is an aneroid instrument and
functions without electrical power. The standby airspeed indicator is a pitot/static
instrument connected to the auxiliary pitot system and operates without electrical
power.
Altitude data is presented by means of a pointer reading against a circular dial and
height counters. Ground pressure is shown by two counters, one in millibars and
one in inches of mercury. They are visible through cutouts in the main dial.
A knob in the lower left hand corner of the case provides the means of setting the
ground pressure counter. It will simultaneously apply a correction to the altitude
counter pointer.
Airspeed data is presented by means of a graduated drum reading against a fixed
datum and visible through a cutout in the lower part of the main dial.
The instrument is integrally illuminated.
Standby Attitude Indicator
A standby attitude indicator is installed on the standby instrument panel below the
GEAR lever. It is a self-contained, electrically-operated gyroscope that turns
around a vertical axis. It operates on DC power from the battery bus. An OFF flag
comes into view when there is a power failure.
Standby Compass
A direct reading standby magnetic compass is installed in the cockpit. It is
magnetically compensated to read within plus or minus 10 degrees error on all
aircraft headings.
ATC Transponder
The system consists of two mode S transponders in the main radio rack, four
antennas installed on the top and bottom fuselage, and a single control panel on
the aft pedestal.
November 16, 2009
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