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switch (inner knob) enables/disables the PFD display of the selected target or
reference airspeed. These speeds are displayed below the IAS scale on the PFD and
are located on the speed tape in their respective positions (V1, VR, V2 and VT).
Manually entered V-speeds will be displayed in cyan. For Precision-Plus-equipped
aircraft, V-speeds can be computed and entered via the FMS where they will be
displayed in cyan. Manually entered V-speeds in Precision-Plus-equipped aircraft are
displayed in magenta.
Altitude Reference Section
To change the altitude value displayed for either the Minimum Descent Altitude
(MDA) or the Decision Height (DH), rotate the DH/MDA (outer) knob to select the
altitude to be amended. The SET (inner knob) switch is rotated to change the values.
These altitudes are displayed on the PFD below the altitude scale. The SET switch is
pushed to enable or disable the display of either the DH or the MDA.
The Radio Altimeter (RA) test switch is depressed to conduct an internal test on the
Radio Altimeter. The RA value on the bottom of the Attitude Direction Indicator will
change to 50 feet and the rising runway symbology, located on the Radio Altimeter
analog scale, moves down 50 feet.
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-19
P I LOT T R A I N I N G GU I D E
Barometric Pressure Section
The Barometric (BARO) knob changes the barometric pressure. Pushing the SET
switch selects standard barometric pressure (29.92 inches of mercury, or 1013
hectopascals). The value is displayed below the PFD altitude scale. The HPA/IN
switch alternately selects barometric pressure correction in hectopascals (hPa), or
inches of mercury (inHg).
Air Data Reference Panel
Figure 11-10
P604_11_044
PUSHSET
OFF
SEL
SPEED REFS
TGT VSPDS
BARO
DH MDA HPA/IN
RA TEST
PUSH
SET
OFF
PUSH
STD
SEL Button
Toggles between V ,
V orV
1
R 2
SPEED REFS Knob
Outer knob
Inner set knob
PUSH OFF
- Selects target
speed or V speeds V , V , V .
- Adjusts value of
selected V-speed.
- Removes display of
selected speed.
VT 1 R 2
RA TEST
Initiates radio
altimeter test
BARO Knob
Knob - rotate to set
barometric pressure.
HPA/IN
Toggles between hPa/mb
or inches of mercury
DH/MDA Knob
Outer knob
Inner set knob
PUSH OFF
- Select DH/MDA.
- Rotate to
set.
- removes display
from PFD.
FLIGHT INSTRUMENTS
11-20 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
PFD Displays
Attitude Display
The attitude symbology provides pitch, roll and slip/skid information. IRS information
is used to drive the attitude symbology. An inverted black V-bar airplane symbol
denotes the aircraft’s relative attitude on the Attitude Director Indicator (ADI).
Large-scale markings are placed at 10, 20, 30, 40, 50, and 65 degrees of pitch. Medium
markings are placed at 5-degree intervals up to ± 30 degrees. Small tick marks are
placed at 2.5-degree intervals up to ± 20 degrees.
Roll scale markings are used to indicate airplane roll angles between ± 60 degrees. The
roll pointer is used with the roll scale to indicate the airplane roll angle. The pointer is
oriented perpendicular to the horizon line and next to the roll scale to represent
degrees of roll (bank) angle. The roll pointer rotates about the center of the airplane
symbol in response to changes in airplane roll angle.
Slip/Skid indicator
The slip/skid indicator is located just below the roll pointer and approximates the
displacement of an inclinometer. The indicator is a small rectangular symbol. The slip/
skid indicator is driven by lateral accelerations.
Unusual Attitude Display
If the airplane is flown into an unusual attitude, all non-necessary indications are
removed. Unusual attitudes occur when pitch exceeds +30 degrees (up), or –20
degrees (down), or when roll exceeds 65 degrees. During excessive attitude, only
pitch, roll airspeed and altitude are displayed. Red chevrons point toward zero in
extreme pitch attitudes. A portion of blue or brown coloring representing sky or
ground remains displayed, regardless of pitch attitude, to assist with orientation.
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-21
P I LOT T R A I N I N G GU I D E
PFD Attitude Displays
Figure 11-11
P604_11_033
1.0
260
220
240
280
20
10
10
30
300
　
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