747 Captain's Primary Flight Display ( PFD )|
by jerome meriweather
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The PFDs present conventional airplane attitude indications, flight director commands and deviation from localizer and glide slope.
In addition, there is an airspeed tape on the left side, an altitude tape and vertical speed indicator on the right side, a partial
compass rose at the bottom, and flight mode annunciations at the top. Takeoff V speeds, REF speed, minimum and limit speeds, radio
altitude and MDA and DH indications can also be displayed. TCAS RA pitch commands are also displayed on the PFD.
Displays the automatic or manually selected Heading Reference.
Displays Heading selected in Heading window on the MCP.
Indicates the current FMC Track.
Selected Heading Bugs
Indicates MCP selected Heading.
Indicates current IRS heading.
- Display IRS Vertical Speed when greater than 400 feet per minute.
- The display is located above the Vertical Speed indication when climbing and below when descending.
Vertical Speed Pointer
Indicates current IRS Vertical Speed.
Barometric Setting Indicator
- Indicates Barometric setting selected on the associated EFIS control panel.
- STD is displayed when the BARO STD switch is selected; if STD is selected a Barometric setting can be preselected.
- The preset Barometric setting is displayed below STD and is selected with the STD switch
- Active pressure setting is green; preset (inactive) pressure setting is white.
Minimum Descent Altitude (MDA) Bugs
Indicates the MDA Altitude as selected on the associated EFIS
control panel and is referenced to MSL.
- Indicates current air data Altitude.
- Altitude box changes to bold white highlight between 900 and 300 feet prior to selected Altitude.
- Altitude box changes to amber deviating 300 and 900 feet from selected Altitude.
- Removed and ALT flag displayed if the selected air data computer fails.
Selected Altitude Bug
- Indicates the Altitude set in the MCP Altitude window.
- When the selected Altitude is off scale, the bug is stowed at the top or bottom of the tape with half the bug visible.
- The bug spans 100 feet.
- Displays the Altitude set in the MCP Altitude window.
- The selected Altitude appears in a box when airplane Altitude is within 900 to 300 feet of selected Altitude.
Indicates selected Approach Course provided by the FMC.
Displays selected ILS identifier or ILS frequency if not identified.
Pitch Limit Indicator
Indicates Pitch Limit at which stick shaker occurs for the existing flight conditions.
Localizer and Glide Slop Indicators and Scale
At low altitudes with autopilot engaged, scale changes to amber and indicators flash for excessive glide slope or localizer deviation.
At low altitudes with LNAV engaged and LOC armed but not captured, localizer scale changes to amber and the indicator flashes for
localizer not captured alert.
Displayed below 1000 feet radio altitude and localizer indicator in view. Rises toward the airplane symbol below 200 feet radio altitude.
Horizon Line and Pitch Scale
Indicates the IRS Horizon relative to the airplane symbol.
Indicates Airplane Attitude
Displays current computed Mach.
Indicates current air data computed Airspeed.
Command Speed Bug
- Points to the Airspeed selected in the MCP IAS/MACH window.>
- Indicates FMC computed Airspeed when the MCP IAS/MACH window is blank.>
- The Bug width spans 5 knots.>
Command Speed Display
Displays the Airspeed selected in the MCP IAS/MACH window or the FMC computed Airspeed/Mach when the window is blank.
Roll and Pitch Annunciators
Indicate TO/GA and TO/GA switches are pushed.
Pushing either or both TO/GA switches twice, initiates windshear guidance. The throttles will advance to maximum EPR and all derates will be removed.