747 Navigation Display
Symbology Key Descriptions, Chart 3
by jerome meriweather
   

Chart 1 - Chart 2 - Chart 3

GREEN (G) - Engaged flight mode displays, dynamic conditions
WHITE (W) - Present status situation, scales, armed flight mode displays
MAGENTA (M) - Command information, pointers, symbols, fly-to condition
BLUE (B) - Non-active or background information
RED (R) - Warning
AMBER (A) - Caution information, faults, flags


Symbol Name Mode Description
VOR ADF Frequency Identifier VOR frequency or identifier (G), ADF frequency or identifier (B) MAP, MAP CTR, VOR, VOR CTR, APP, APP CTR Frequency is displayed before identifier is decoded. Decoded identifier replaces the frequency. For VORs, small size characters indicate only DME information is being received.
DME Distance DME distance (G) MAP, MAP CTR, VOR, VOR CTR, APP, APP CTR Indicates DME distance to th referenced navaid.
Track Indicator Track indicator (W) VOR, VOR CTR, APP, APP CTR Indicates map background is oriented and referenced to true north.
Selected HDG Marker Selected Hdg Marker ALL Displays the heading set on MCP. A dashed line (M) extends from the marker to the airplane symbol continuously in H DG SEL, and for 10 seconds in LNAV.
Map Source Annunciation Map source annunciation (G) MAP, MAP CTR Displays ND source if CDU selected on respective NAV source select switch.
IRS and FMC Updata Status IRS/FMC Update status (G) MAP, MAP CTR Displays IRS/FMC update status based on the IRSs. Transition from IRS (3) to any other annunciation highlited by a green box for 10 seconds.
GPS Position GPS position (W) MAP, MAP CTR When the EFIS POS map switch is selected on, indicates GPS position relative to FMC position.
IRS Positions IRS position(s) (W) MAP, MAP CTR When the EFIS POS map switch is selected on, indicates IRS position relative to FIVIC position.
TCAS Resolution Advisory TCAS Resolution Advisory (RA) Relative Altitude (R) MAP, MAP CTR, APP, VOR
  • These symbols are displayed only when the EFIS control panel traffic (TFC) switch is selected on.
  • The arrow ondicates traffic climbing or descending at a rate greater than or equal to 500 fpm. No arrow indicates the traffic is relatively level.
  • For relative altitude symbols, the numeric and associated signs indicate altitude of traffic in hundreds of feet relative to the airplane.
  • For absolute altitude symbols, the numeric indicates altitude of traffic in thousands and hundreds of feet, Relative versus absolute altitude display is selected on the transponder/TCAS control panel.
  • For both relative and absolute altitude, the numeric is below the traffic symbol when the traffic is below and above the traffic symbol when the traffic is above the airplane. Absence of the numeric implies altitude unknown.
TCAS Traffic Advisory TCAS Traffic Advisory (TA) Relative Altitude (A)
TCAS Proximate Traffic, Relative Altitude TCAS Proximate Traffic, Relative Altitude (W)
TCAS other Traffic, Relative Altitude TCAS other Traffic,Relative Altitude (W)
TCAS No Bearing Message TCAS No Bearing Message (RA-R, TA-A) MAP, MAP CTR, APP, VOR Message provides traffic type, range inNM, altitude and vertical direction.
TRAFFIC TCAS Traffic Alert Message (RA-R, TA-A) ALL Displayed whenever a TCAS RA or TA is active. EFIS control panel TFC switch does not have to be selected on.
OFF SCALE TCAS Off Scale Message (RA-R, TA-A) MAP, MAP CTR, APP, VOR Displayed whenever RA or TA traffic is outside the traffic area covered by the ND range. Displayed only if the EFIS control panel TFC switch is selected on.
TFC TCAS Mode (B) MAP, MAP CTR, APP, VOR Indicates the ND TCAS display is active; the EFIS controlpanel TFC switch is selected on.
TA ONLY TCAS Mode (B) ALL Indicates TCAS computer is not computing TAs. Displayed whether the EFIS control panel TFC switch is selected on or off.
TCAS TEST TCAS Mode (B) ALL Indicates TCAS is operating in the test mode.
TCAS OFF TCAS Mode (A) MAP, MAP CTR, APP, VOR Displayed when the TCAS/ATC mode switch is not in TA ONLY or TA/RA, whether traffic is selected or not. Not displayed if TCAS is failed.
TCAS FAIL TCAS Mode (A) MAP, MAP CTR, APP, VOR Indicates TCAS failure.