Trio Avionics EZ Altitude Control - Manual (Page 20)

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VS SET
500
VS SET
400
VS
400
VS
SET
0
8.0 The EZ-2 / EZ-3 ALTITUDE CONTROL SYSTEMS with Climb and
Descent capability.
Section 8 describes the additional features of the EZ-2 systems. The EZ-2 and EZ-3 altitude
control system incorporates all of the features of the EZ-1 while adding several additional
capabilities and safety features.
• A major safety feature of the EZ-2 and EZ-3 system is its ability to prevent the system
from stalling or over speeding the aircraft. To facilitate this, the electronic module
contains an airspeed sensor, which must be connected to the aircraft pitot system.
• Another safety feature is autopilot disconnect on take off. The autopilot will automatically
disconnect at an airspeed below 50 kts IAS - if inadvertently left on during takeoff.
• Vertical climbs and descents may be performed by setting the desired vertical rate via the
encoder knob and LCD switch.
• Pilot Command Steering (PCS) allows the pilot to press the remote disconnect switch to
fly the aircraft manually to establish a desired climb or descent rate and (when the remote
disconnect button is released) the aircraft will hold that vertical rate.
•
Alternatively, the pilot may choose– via a setup menu – to have the PCS mode climb and
descend on airspeed (instead of vertical speed). This will allow the ability to maintain a
specific airspeed during climb or descent to help maintain proper engine temperature.
8.1 EZ-2, EZ-3 Operation
8.1.1 VS Mode
To enter a vertical climb or descent rate, momentarily press the
encoder button until the VS set selection screen is present on the
LCD switch. The screen color will change to amber and display
the message shown. This screen may be used to set the desired
vertical speed regardless of whether the system is in the “ALT
HOLD” or in the “READY” mode.
If the LCD switch is pressed while the VS SET 0 screen is active,
or the vertical rate is set to zero while the VS mode is active, the
system will capture and hold the current altitude.
Rotating the encoder knob while the VS set selection screen is
active will change the vertical speed increment (VSI) on the
screen in 100 foot per minute intervals – to a maximum setting of
2,000 feet per minute. Rotating the knob clockwise will indicate
that a climb rate is being input. Rotating the knob
counterclockwise will indicate that a descent is being entered.
Once the desired vertical rate has been entered, the pilot must
press the LCD switch to begin the climb or descent. If the
display was in the “READY” mode (system not engaged),
pressing the LCD switch will engage the servo and the climb or
descent will begin. If the display is in the “ALT HOLD” mode
when vertical speed is selected, it will begin to execute the climb
or descent rate once the LCD switch is pressed. If the VS SET 0
screen is active when the LCD is pressed the system will hold the
current altitude.
When the LCD switch is pressed, the color of the screen changes to green and displays a
“VS ACT” (Vertical Speed Active) message. Once the aircraft is climbing or descending