MD-11 Flight Crew Operations Manual
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Instrumentation and Navigation Chapter Inst
Description and Operation Section 10
Inst.10.1
Inst.10 Instrumentation and Navigation-Description and Operation
General
The instrumentation and navigation systems include both ground dependent and
independent systems. The systems provide displays and annunciations for aircraft
attitude, airspeed, altitude, vertical speed, heading, direction, course, and time.
EIS Control Panel (ECP)
An ECP is installed on both outboard ends of the glareshield. The ECPs control
the operation of the Captain's and First Officer's ND and PFD.
For a description of the ECP controls relating to the PFD refer to the Automatic
Flight chapter.
Multifunction Control Display Unit (MCDU)
Two MCDUs are installed in the forward pedestal. These are the primary
interfaces for the Flight Management System (FMS). A third MCDU is installed
in the aft pedestal for interface with the centralized fault display and ACARS
systems.
Each MCDU continuously stores current flight plan waypoints. The MCDUs are
coupled to the Inertial Reference System (IRS). This provides navigation flight
planning and lateral guidance to all waypoints previously stored in the FMS flight
plan (or added to the flight plan in the standby mode) in case of dual flight
management computer (FMC) failure.
The MCDUs also provide flight plan data for the Navigation Display (ND) and
standby tuning for the navigation radios.
The VOR, ADF, and ILS equipment are automatically tuned from the FMS in
accordance with the selected SID, STAR, or enroute navigational aid
requirements. The FMS also tunes the scanning DME to the associated VOR and
ILS station and scans three other DME frequencies to obtain position updating
data.
Manual tuning of the VOR/DME, ADF, or ILS is available through the MCDU.
If either the Captain's or First Officer's MCDU fails, operation is normal through
the remaining MCDU. If a single FMC fails, normal operation continues through
the remaining FMC. If both FMCs fail, each radio may be manually tuned by
entering the required frequencies in the associated MCDU.
For a complete description of the MCDU refer to the FMS chapter.
October 02, 2006
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