Trio Avionics EZ Altitude Control - Manual (Page 24)

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NOTE: To enable a PCS climb or descent, the pilot must establish a vertical speed of at least 200 fpm
while holding the remote disconnect switch down. If the switch is released without achieving 200 fpm,
the system will enter the ALT HOLD mode when it is released. This is to facilitate joint use of the PCS
remote disconnect switch for both the altitude hold and VS/AS features. While performing a turn under
PCS control, it may be difficult to hold altitude (or vertical speed) while turning, and this feature helps
prevent an unwanted PCS climb command.
AS
TRK
ACTIVE
PCS
VRTSPD
ARMED
AS
TRK
SELECT
VS
400
pressing the LCD switch) will store this function in nonvolatile memory. The PCS mode
will now climb and descend on airspeed rather than vertical speed. Therefore, a pilot
may wish to climb at, say, 120 knots for best engine cooling. This may now be done by
pressing and holding the remote disconnect switch and placing the aircraft into a climb
that indicates an airspeed of 120 knots. Releasing the button will reengage the servo
and continue the climb at that airspeed.
PCS “Active” Displays
PCS VRTSPD – Pressing the remote servo disconnect switch will disengage the servo.
However, if the switch is held down for more than 3 seconds, the screen will begin to
flash and display the message “PCS VRTSPD ARMED”. This message indicates that
the servo will reengage when the switch is released. If the PCS has been set up to climb
and descend on vertical speed (instead of airspeed), once the remote disconnect switch
is released the LCD screen will show a normal “VS” (Vertical Speed Active) message. It
will display the approximate vertical
speed that was established by the PCS
maneuver, and after a short period of
time it will probably also show that the
aircraft needs to be trimmed for the
climb or descent. Once this display
appears, it is also possible for the pilot
to alter the climb or descent rate by
rotating the encoder knob.
PCS AIRSPD – Here again, while the remote servo disconnect switch is being held down
the screen will begin flashing READY,
and after a 3 second delay and the
display will read “AS TRK SELECT”. If
the PCS has been set up to climb and
descend on airspeed, the LCD screen
will show the message “AS TRK
ACTIVE”. While in this mode, the
aircraft will climb or descend at the
airspeed selected. Trim arrows may also be displayed and, if the aircraft is significantly
out of trim, it will be necessary to correct the trim imbalance to achieve the proper
airspeed. Once this display appears, it is also possible for the pilot to increase the
airspeed by rotating the encoder know clockwise, or decrease the airspeed by rotating
the encoder knob counterclockwise.