777 Primary Flight Display (PFD)
by jerome meriweather
   

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Bank Pointer Barometric Reference Horizon Line and Pitch Scale Current Altitude Selected Altitude Altitude Indicator Glideslope Scale Glideslope Scale Glideslope Scale Glideslope Scales Glideslope Scale Glideslope Scales Radio Altitude Slip/Skid Indicator Flight Path Vector Speed Trend Vector Vertical Speed Pointer AutoPilot/Flight Director System Status Minimum Maneuvering Speed Selected Speed Approach Reference Selected Altitude Bug Marker Beacon Indicator Current Heading Pointer Selected Heading Bug AFDS Flare AFDS LOC AFDS Rollout AFDS Speed AFDS G/S Glideslop and Localizer Pointer Glideslop and Localizer Pointer Vertical Speed Indicator Airplane Symbol Airplane Symbol Selected Speed Bug Airspeed and Mach Selected Vertical Speed Bug Selected Heading/Track Heading/Track Reference BARO Minimums Pointer Baro or Radio Minimums Current Mach Current Airspeed Heading and Track Indicator Heading and Track Indicator Vertical Speed Track Line Pitch Limit Indicator Pitch Limit Indicator Selected Track Bug
777 Photo and/or Graphic Element
  

PFDs are part of a six display units that replace most conventional flight and engine instruments. Display management computers acquire and process all input from airplane sensors and computers to generate the display images. If a display fails, automatic and manual switching allow the display to be transferred to an operable display unit.

The PFDs present a dynamic color display of all the parameters necessary for flight path control. There are two PFDs one each for the Captain and First Officer.

For every indicator on the PFDs, there is a respective Failure Flag Indicator that is displayed when there is a source system failure or a lack of computed information.

 

Selected Track Bug ( MCP Selection )
The selected track bug is displayed on the inside of the compass rose. If selected track exceeds display range, the bug parks on the side of the compass rose in the direction of the shorter turn to the track.
Pitch Limit Indicator
Indicates pitch limit (stick shaker activation point for the existing flight conditions). Displayed when flaps are not up or at slow speeds with flaps up.
Track Line
Indicates the current FMC track.
Vertical Speed
Displays ADIRS vertical speed when greater then 400 feet per minute. The display is located above the vertical speed indication when climbing and below when descending.
Heading and Track Indicator
Displays planes heading and track reference.
Current Speed
Indicates current ADIRS airspeed.
Current Mach
Displays current ADIRS mach when greater than .40 mach.
BARO/Radio Reference
Displays Radio when the EFIS control panel MINS reference selector is set to Radio or displays BARO when the EFIS control panel MINS reference selector is set to BARO.
Heading/Track Reference
Displays the automatic or manually selected heading/track reference.
Selected Heading/Track ( MCP Selection )
Digital display of the selected heading or track bug.
Selected Vertical Speed Bug
Indicates the speed selected in the MCP vertical speed window with the V/S pitch mode engaged.
Airspeed and Mach
Airspeed and Mach Indicator.
Selected Speed Bug
Points to the airspeed/mach selected in the MCP IAS/MACH window or indicates FMC computed airspeed when the MCP IAS/MACH window is blank. The bug width spans 5 knots. When the selected speed is off scale, the bug is parked at the top or bottom of the scale with only half the bug visible.
Airplane Symbol
Indicates airplane attitude with reference to the ADIRS Horizon Line.
Vertical Speed Indicator
Displays the scales for the ADIRS vertical speed of the plane.
Glideslope and Localizer Pointers
The glideslope pointer is in view when the glideslope signal is received. Pointer becomes solid when 2 1/2 dots from the scale center.
G/S Mode
If G/S is engaged then the AFDS follows the ILS glideslope.
Speed Mode
The autothrottle maintains the selected speed displayed on the PFD. Autothrottle will not exceed the operating speed limits or the thrust limits displayed on the EICAS.
Rollout Mode
If armed, then Rollout is displayed below 1500 feet RA and engages below 2 feet. If Rollout is engaged, after touchdown, the AFDS uses Rollout rudder and nosewheel steering to keep the airplane on the localizer centerline.
Localizer Mode
If the LOC is armed then the AFDS captures the localizer when within range and within 120 degrees of the localizer track. If the LOC is engaged then the AFDS follows the selected localizer course.
Flare Mode
If Flare is armed, then during an autoland, Flare is displayed below 1500 feet RA. If Flare is engaged, then during an autoland, flare engages between 60 and 40 feet radio altitude. Flare accomplishes the autoland flare maneuver so the AFDS can transition to the Rollout mode.
Selected Heading Bug ( MCP Selection )
The selected heading bug is displayed on the outside of the compass rose. If selected heading exceeds display range, the bug parks on the side of the compass rose in the direction of the shorter turn to the heading.
Current Heading Pointer
Indicates current ADIRS heading.
Marker Beacon Indicator
The Marker Beacon indication appears and flashes when over one of the marker beacon transmitters:
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.
Approach Reference
Displays the selected ILS identifier or frequency, approach course and ILS DME distance.
Selected Speed
Displays the airspeed/mach selected in the MCP IAS/MACH window or the FMC computed airspeed/mach when the window is blank.
Minimum Maneuvering Speed Indicator
Indicates maneuver speed margin to stick shaker or low speed buffet.
Autopilot/Flight Director System Status ( AFDS )
Indicates that the AFDS system is on.
Vertical Speed Pointer
Indicates current vertical speed.
Speed Trend Vector
Indicates predicted airspeed in ten seconds based on current acceleration or deceleration.
Flight Path Vector ( FPV )
Displays flight path angle and drift angle if one of the following is selected:
Slip/Skid Indicator
Displaces beneath the bank pointer to indicate slip or skid. Turns solid white at full scale deflection and solid amber at bank angles of 35° or more.
Radio Altitude
Radio Altitude Indicator.
Glideslope and Localizer Scales
In view after the frequency is tuned. At low altitudes, with the autopilot or flight director engaged, the scale turns amber and the pointer flashes to indicate excessive deviation. With LNAV engaged and LOC armed scale turns amber and pointer flashes if localizer is not captured. When airplane is close to center line, expanded localizer scale appears. Dots are replaced by rectangles which represent 1/2 dot deviation.
Altitude Indicator
Indicates the Altitude of the plane.
Selected Altitude
Displays the altitude set in the MCP altitude window. The selected altitude appears in a box when plane's altitude is within 900 to 200 feet of selected altitude.
Current Altitude
Indicates current ADIRS altitude.
Horizon Line and Pitch Scale
Indicates the ADIRS horizon relative to the Airplane Symbol.
Barometric Reference
Indicates the barometric setting selected on the EFIS control panel barometric selector. STD is displayed when STD is selected on the EFIS control panel barometric STD switch. The display appears in a box and changes to amber if a barometric setting is set and altitude climbs above the transition altitude, or if STD is set and altitude descends below the transition flight level. The preset barometric setting is selected on the EFIS control panel barometric selector and is displayed below STD. ( IN - inches of mercury/HPA = hectopascals ) L or R indicates that the left or right EFIS control panel is the barometric setting reference for the autopilot or flight director.
Bank Pointer
Indicates ADIRS bank in reference to the bank scale. Turns solid amber at bank angles of 35° or more.