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autopilot must be in NAV/APR/ALT modes; and (4) the airplane must
be 60% or more below the glideslope centerline during the approach
to the intercept point, and within 50% needle deviation of the localizer
centerline at the point of intercept – usually the outer marker. When
the above conditions have existed for 10 seconds, the GS annunciator
will illuminate indicating GS arming has occurred (ALT annunciator will
remain on). When the glideslope is intercepted and captured, the ALT
annunciator will go out.
ALT (Altitude Hold), Mode – When ALT is selected, the autopilot will
hold the altitude at the time the mode was selected. Altitude hold will
not engage if an autopilot roll mode is not engaged. Altitude correction
for enroute barometric pressure changes may be made by rotation of
the VS knob on the autopilot programmer/computer. Clockwise
rotation will increase and counterclockwise rotation will decrease
altitude 20 feet for each ‘click.’ The maximum adjustment is ±360 feet.
Adjustments greater than 360 feet can be made by selecting VS mode
and flying the airplane to the new altitude and then re-engaging ALT
mode.
VS (Vertical Speed) Mode – When VS is selected, the autopilot will
synchronize to and hold the vertical speed at the time the mode was
selected. Altitude hold will not engage if an autopilot roll mode is not
engaged. The vertical speed is displayed in 100-foot increments at the
far right of the programmer/computer window next to the VS
annunciation. A plus (+) value indicates climb and a negative or minus
(-) value indicates descent. Vertical speed can be adjusted by rotating
the VS knob on the programmer/computer. Clockwise rotation
increases and counterclockwise rotation decreases rate of climb (or
descent) 100 FPM for each ‘click.’ The maximum adjustment is ±1600
FPM.
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Cirrus Design Section 9
SR22 Supplements
Altitude Selector / Alerter
The altitude selector / alerter provides the autopilot with an altitude
preselect function, a programmable vertical speed function, as well as
provides altitude alert, decision height alert, and baro corrected
altitude display. The altitude selector reads and decodes altitude
information from the same altitude encoder that provides altitude
information to the transponder. The decoded altitude is baro corrected
and then compared to the selected altitude setting. When the decoded
and baro corrected altitude matches the selected altitude, the altitude
selector signals the autopilot to engage the ALT hold mode. The
altitude select (ALT SEL) function is operable only when the
transponder and encoder are operating and then both the autopilot
ALT and VS modes are selected.
The altitude selector also provides a vertical speed signal to the
autopilot pitch computer that is proportional to the amplitude and
direction of the selected or computed vertical speed. This signal is not
used by the autopilot until the autopilot VS mode is engaged. When
VS is engaged, the autopilot compares the selected vertical speed
signal with the existing vertical speed derived from the autopilot’s
altitude transducer and maneuvers the airplane to attain the selected
vertical speed. The Vertical Speed (VS) select portion of the altitude
selector / alerter is showing a selected vertical speed (VS annunciator
on) and the autopilot Vertical speed (VS) mode is engaged.
The altitude selector / alerter also provides Decision Height (DH) and
Altitude Alert (ALR) selection. All selector function selection is made
through the altitude selector/alerter. Available functions are as follows:
Revision 4: 07-18-05
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Section 9 Cirrus Design
Supplements SR22
DTA (Data) – The data entry button is used to select data entry mode.
The first time the DTA button is pressed the selector will enter the data
entry mode, the ENT annunciator will come on, and the SEL
annunciator will flash to indicate the system is ready to accept an
altitude entry. To change baro (BAR) correction, Decision Height (DH),
or Vertical Speed (VS), press the appropriate button on the selector
and rotate the input knob at the right of the display CW to increase the
displayed numbers and CCW to decrease the displayed numbers. Pull
the knob out and rotate as required to change the decimal numbers.
When the system is in the ENT mode, it is not coupled to the autopilot.
In this mode, the autopilot will hold the last vertical speed selected.
• Note •
It is not necessary to enter the DTA mode to change the
　
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