MD-11 Flight Crew Operations Manual
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Instrumentation and Navigation -
Description and Operation
Inst.10.3
Four ND modes (MAP, PLAN, VOR, and APPR) can be selected from the ECPs.
Bearing pointer and weather radar displays are available in MAP, VOR, and
APPR modes only.
Selected sources are not annunciated for the normal on-side sources (Captain on
1 First Officer on 2). When alternate sources have been selected the source is
annunciated in the upper right of the display.
The selected IRS heading/track source is not annunciated if the source is the
normal on-side source for that display. If a different source is selected, it will be
annunciated in white to the left of the digital heading/track display area. When the
Captain's and First Officer's IRS source are the same, they are annunciated in
amber on both NDs.
When an alternate FMS source has been selected (Captain on 2 or First Officer on
1) and the ND is in MAP or PLAN modes, the source is annunciated in amber
below the distance to go display in the top right corner of the display.
When an alternate Course Deviation Indicator (CDI) source (VOR, ILS) has been
selected (Captain on 2 or First Officer on 1) and the ND is in VOR or APPR
modes, the source is annunciated in amber below the distance to go display in the
top right corner of the display.
If data is marked as no computed data by its source, all symbology dependent on
that data will be removed from the ND. No failure flags will appear.
VHF Omnidirectional Range/Marker Beacon (VOR/MB)
The VOR/MB radio system is an aircraft navigation aid in the frequency range of
108 to 118 MHz (VOR) and 75 MHz (MB).
Two VOR/MB receivers are installed but marker beacon signals are received and
processed by VOR/MB receiver 1 only.
The VOR airborne equipment receives and presents this information in such a way
that the relative bearing with respect to the ground transmitter can be determined.
Any bearing with respect to the ground station can be selected and flown.
The VOR unit supplies bearing data to interface with the ND and the FMS.
The marker beacons provide enroute flight reference points and landing guidance.
Marker beacon annunciations are displayed above the minimums (DH or BARO)
display on the PFD. Passing over an outer marker generates a sequence of two
aural dashes and a flashing blue light. The middle marker generates an aural dot
dash sequence and a flashing amber light. The inner marker generates an aural
string of dots and a flashing white light.
October 02, 2006
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