PRIMARY DISPLAY SYSTEM -PFD ATTITUDE AREA
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777 AIRCRAFT MAINTENANCE MANUAL
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PRIMARY DISPLAY SYSTEM -PFD AIRSPEED INDICATION
General
The airspeed indication is a display that moves against a fixed pointer. The indication has a visible range of 121 knots. Lines show at 10 knot intervals from 30 knots to 990 knots. Numbers show every 20 knots from 40 knots to 980 knots. Airspeed indication limits cause the display to show 30 knots for computed airspeed inputs of 30 knots or less (airspeed NCD).
Airspeed and MACH Number
A digital readout in the center of the tape shows the current computed airspeed (CAS) from the ADIRS. As the value changes, the digits move to simulate a drum type readout. The tape moves so that the current CAS shows by the point of the readout box. Current MACH shows below the speed tape for MACH values greater than 0.4. The information goes away when MACH goes below 0.38 or when MACH fails.
Selected Speed
Selected speed or MACH show as a pointer against the speed tape. The pointer is magenta and is rectangular with a point on one end that shows the selected speed. A numeric readout of the selected speed or MACH shows above the airspeed indication.
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Takeoff Reference Speeds
The takeoff reference speeds have of three symbols that show against the speed tape before and during takeoff roll. The bugs show as a green dash followed by V1, VR, or V2. V1 is the decision speed for takeoff abort. VR is the recommended rotation speed. V2 is the takeoff safety speed. The FMCF calculates these speeds. The pilots use the CDU to accept or change the speeds. V1 and VR go away after lift-off. V2 goes away after lift-off when the flaps begin to raise. VR changes to R when GS is less than four knots.
Landing reference speed shows as a green dash and the letters REF.
Flap Maneuver Speeds
Two flap maneuver speeds show. The speeds agree with the current flap selection and the next retracted flap selection. The speeds show as tick marks on the airspeed tape with labels for the flap selections.
Limit Speeds
Maximum speed shows as a red and black barber pole that extends from the top of the speed tape. The barber pole extends to either VMO, MMO, flap placard or gear placard, whichever is smaller. The maneuver margin shows as a hollow amber bar that extends down from the bottom of the maximum speed barber pole. It represents the highest speed before the start of high speed buffet.
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PRIMARY DISPLAY SYSTEM -PFD AIRSPEED INDICATION
Minimum speed shows as a red and black barber pole that extends from the bottom of the speed tape to the Minimum speed.
The maneuver margin shows as a hollow amber bar above the minimum speed barber pole. It shows the minimum maneuvering speed of the aircraft. This speed depends on flap/slat settings.
Speed Trend Vector
The length and direction of the green speed trend vector shows the airspeed in ten second intervals based on current acceleration.
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PRIMARY DISPLAY SYSTEM -PFD AIRSPEED INDICATION
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PRIMARY DISPLAY SYSTEM -BAROMETRIC ALTITUDE AND VERTICAL SPEED
General
Barometric altitude shows as a digital readout on a moving tape. As altitude changes, the tape moves against a fixed readout box that contains a drum type readout. The baro altitude tape goes from a -9900 feet to 99900 feet. Lines show every 100 feet with numbers every 200 feet.
Selected Altitude
A selected altitude bug shows the selected altitude from the mode control panel (MCP). The bug rests at the top or the bottom of the scale with only half the bug visible when the selected/target altitude is off the scale. The meters (MTRS) switch on the onside EFIS control panel adds the actual altitude and selected altitude show in meters.
Baro Minimums (MDA)
The baro minimums show as a pointer and a digital readout. A knob on the EFIS CP lets the operator set the value. Baro minimums or MDA has a range that starts at -1000 feet. For values less than -1000 feet, the pointer and readout go away.
Barometric Reference
Barometric reference data includes:
*
Actual barometric reference
*
Barometric reference source (L or R)
*
Preselected barometric reference
*
Barometric correction reference (QNH or QFE).
An amber box shows around the reference readout for a barometric transfer warning.
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