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for example, a 29.92 inch Hg setting is input and displayed as
29.9.
4. Press DTA again to accept the entry.
Set Decision Height (DH)
1. Press altitude selector DTA button to enter the data entry (ENT)
mode.
2. Press DH button to enter decision height with the display reading
0.0. Use the altitude selector knob to set the desired decision
height to the nearest 100 ft above the desired decision height. For
example, for a DH of 1160 feet, set 1200 feet.
3. Press altitude DTA button again to enter the selected DH. The
display will show the selected decision height for approximately 5
seconds and then revert to ALT mode and display the altitude. The
DH annunciator will remain illuminated indicating a decision height
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SR22 Supplements
is set. As the airplane approaches within approximately 50 feet of
the decision height, the alert will sound and the DH light will flash.
As the airplane passes through approximately 50 feet beyond the
decision height, the alert will sound and the light will flash again.
• Note •
Pressing the DH button again will disable the DH function
causing the DH annunciation to go out. Repeated activation of
the DH button alternately activates and deactivates the DH
mode.
Set Altitude Alert (ALR)
1. Press altitude selector ALR button to arm alert mode. The ALR
annunciator will come on. Upon entering within 1000 feet of the
altitude selected in ALT SEL, the altitude alert chime will sound in
the cabin speaker and headphones and the ALR annunciator will
flash. The chime will sound and the ALR annunciator will flash
again as the airplane approaches within 300 feet of the selected
altitude. If the airplane’s altitude deviates ± 300 feet from the
selected altitude, the chime will sound and the ALR annunciator
will flash to indicate the condition.
2. To disable ALR, press the altitude selector ALR button again. The
ALR annunciator will go out.
GPS Tracking and GPS Approach
1. Begin with a reliable GPS signal selected on the NAV receiver.
2. Select desired course on HSI and establish a desired intercept
heading.
3. Press the NAV button on the autopilot programmer/computer
twice. The NAV and GPSS mode annunciators will illuminate.
• Note •
If the course needle is at full-scale deviation, the autopilot will
establish the airplane on a heading for a 45° intercept with the
selected course. As the airplane approaches the course, the
autopilot will smoothly shallow the intercept angle. The pilot
may select an intercept angle less than the standard 45° by
setting the desired intercept heading with the HSI HDG bug,
pressing and holding HDG, and then pressing NAV once to
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Section 9 Cirrus Design
Supplements SR22
intercept course in NAV mode or twice to intercept course in
GPSS mode on the autopilot programmer/computer. When
the on-course intercept turn begins the HDG mode will
disengage and the annunciator will go out.
During the intercept sequence, the autopilot operates at
maximum gain and sensitivity (90% of standard rate turn).
When the selected course is intercepted, course deviation
needle centered, the course-tracking program is activated.
The system will remain at maximum sensitivity for
approximately 15 seconds while the wind correction angle is
established. The maximum turn rate is then reduced to 45%
standard rate. Approximately 60 seconds later, the maximum
turn rate is reduced to 15% standard rate.
4. For increased sensitivity during GPS approach or if desired for
enroute tracking, press the APR button on the autopilot
programmer/computer. The NAV, GPSS, and APR annunciators
will be illuminated. Use HDG to accomplish a procedure turn.
Engage GPSS again to complete the approach.
VOR Tracking and VOR-LOC Approach
1. Begin with a reliable VOR or VOR-LOC signal selected on the
NAV receiver.
2. Select desired course on HSI and establish a desired intercept
heading.
3. Press the NAV button on the autopilot programmer/computer. The
NAV mode will illuminate. Course interception and tracking will be
as described under GPS Tracking and GPS Approach above.
4. For station passage, set HDG bug to within 5° of selected course.
• Note •
If the HDG bug is within 5° of center and the course deviation
is less than 10%, the autopilot will immediately establish the
lowest level of sensitivity and limit the turn rate to a maximum
of 15% of a standard rate turn.
　
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