MD-11 Flight Crew Operations Manual
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Instrumentation and Navigation -
Controls and Displays
Inst.30.6
7. Curved Trend Vector
The curved trend vector consists of three green arcs starting at the nose of the
reference aircraft. The end points of these segments correspond to the
predicted position of the aircraft in 30, 60, and 90 seconds at the current
groundspeed and rate of turn. The 30 second arc is shown for all ranges. The
60 second arc is shown for ranges equal to or more than 20 miles. The 90
second arc is shown for ranges equal to or greater than 40 miles. These arcs
are filtered to reduce activity due to gusts.
8. Weather Radar Annunciator Display
Weather radar data consisting of range, tilt angle, and fault or warning
messages are displayed in this area. Maximum range of weather radar display
is 320 NM. Tilt angle is controlled from the weather radar control panel
located on the pedestal. When weather radar display is disabled, WX OFF is
displayed in this area.
9. Bearing Pointers
Bearing pointers are controlled from the ECP. Each pointer may show VOR
or ADF data or may be turned off. Pointer 1 (cyan single arrow) always shows
data from the left radios and pointer 2 (green double arrow) always shows
data from the right radios. Bearing pointer data is at the bottom of the ND.
Outboard of the ident or frequency is the bearing and distance to the station.
Pointer 1 data is in cyan and pointer 2 data is in green.
10. Crosstrack Deviation
Crosstrack deviation is activated when the DATA switch on the ECP is
pushed. Indicates L or R crosstrack deviation in NM. Normally displayed in
white. L-R is displayed in amber if crosstrack deviation is invalid.
11. Navigation Modes
Navigation modes are displayed as follows:
• R NAV indicates radio navigation only.
• IRS NAV indicates inertial navigation only.
• R/I NAV indicates radio and inertial navigation.
• NO NAV indicates no navigation mode is active.
• G/I NAV indicates GPS and inertial navigation.
• GNS NAV indicates GPS navigation only.
• Any invalid mode is flagged with an amber X.
12. Active Map Modes
Additional map data is controlled with the DATA, WPT, VOR, NDB, and
ARP modes switches on the ECP. Active modes are shown in the lower left
of the ND. Modes are displayed as follows:
October 02, 2006
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