The PFD format is divided into two main sec-
tions. The top half displays an attitude direc-
tor indicator (ADI) with an indicated airspeed
tape to the left, and a barometric altitude tape
to the right.
A horizontal situation indicator (HSI) is located
on the lower half of the PFD. The HSI can be
displayed in three different formats which will
be referred to as HSI, ARC and MAP. HSI is
used to identify that area of the PFD that con-
tains the horizontal situation indicator and it
is also used when referring to the full 360°
compass rose format. The different formats
are selected with the HSI button on the display
controller. The three options are a full 360°
compass rose (HSI), a 90° compass arc display
(ARC), and a 90° map display (MAP). Weather
information can be displayed on the PFD ARC
or MAP format. To the right of the HSI, a ver-
tical speed indicator (VSI) is displayed, and to
the left, navigation information is annunci-
ated.
PFD Displays
The following is a description of the major dis-
plays within the display. Refer to Figures 16-
31 thru 16-36 for supporting illustrations.
Attitude
The aircraft symbol is fixed at the center of the
ADI display, and the annotated sphere moves
to display the airplane attitude. The ADI dis-
play is as illustrated in Figure 16-31. Within
the ADI sphere is a pitch tape, a roll pointer
and sky/ground shading. A roll scale is also
displayed on the top of the ADI sphere. The
on-side AHRS normally provides the infor-
mation to drive the attitude display. The flight
director provides the pitch and roll command
bars. Failure of either the pitch or roll data is
indicated by removing the pitch scale mark-
ings, turning the entire attitude sphere to cyan
and displaying a red "ATT FAIL" in the top
center of the ADI.
Pitch Attitude Tape
On the ADI sphere, a pitch attitude tape indi-
cates the pitch attitude of the aircraft. Pitch
index lines are displayed in +5° increments
from level flight to +30°, then at +40°, +60°,
and at +90°. Red excessive pitch chevrons are
displayed, as a reference for rapid determi-
nation of the horizon, for pitch attitudes greater
than 17.5° nose up/down (Figure 16-34).
Roll Attitude Scale
A roll scale is displayed above the ADI sphere
and provides index ticks at 10, 20, 30 and 60°
of roll attitude. Unfilled triangles are located
at 0 and 45°. When "BNK" is selected on the
flight guidance controller, a green 14° roll
arc, or low bank arc, is displayed on the ADI
roll scale. BNK automatically engages at
41,600 feet if HDG or NAV (VOR) modes are
active.
Roll Attitude Pointer
This pointer is a filled triangle and moves in-
side the top edge of the ADI sphere to indicate
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
16-48
FOR TRAINING PURPOSES ONLY
FlightSafety
international