Trio-avionics EZ Altitude Control Manuel d'utilisateur télécharger pdf (Page 25)

ELEV

SET

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9.0 The EZ-3

ALTITUDE CONTROL SYSTEM with Altitude Pre-select

Section 9 describes the additional features of the EZ-3 system. The EZ-3 altitude control

system incorporates all of the features of the EZ-2 while adding altitude pre-select and

other capabilities.

•

The pilot may pre-select a destination altitude. When engaged, the system will

command the aircraft to climb or descend to the selected altitude. Upon arrival at the

destination altitude, the system will automatically switch to the ALT HOLD mode and

assume level flight.

•

To be accurate, the EZ-3 must have current altitude information. Once the pilot has

adjusted the baro setting on the aircraft altimeter, the baro altitude in the EZ-3 may

be easily adjusted to agree with the aircraft altimeter.

• When initiating a climb or descent to a destination altitude, the EZ-3 system will begin

the climb/descent at either the rate set by the pilot, or a vertical speed that has been

predetermined in the SETUP menu. The factory preset is 500 fpm, but this may be

changed by the user. Once the climb or descent is under way, the pilot may toggle

the display to the VS (Vertical Speed) screen and adjust the current climb/descent

rate to a different vertical speed.

• If, at any time, (in a climb, descent or level flight) it is desired to have the system

track an airspeed, the user may toggle to the screen labeled AIRSPD TRACK

SELECT and press the LCD switch. The system will then vary the pitch angle of the

aircraft to maintain that speed. For instance, a climb may have been commanded

with a vertical speed (VS) command of 1,000 fpm. While at low altitude this may be

realistic for some higher powered aircraft, but as you climb higher the airspeed will

drop off as the system attempts to hold 1,000 fpm. When the airspeed drops to the

“best engine cooling” speed, the pilot may press the AIRSPD TRACK SELECT

screen and the system will hold that airspeed for the duration of the climb.

9.1 EZ-3 Operation

For the Altitude Pre-select to be accurate, it is important that the system be calibrated for

the current local barometric pressure. Just as the primary aircraft altimeter must be

adjusted to compensate for barometric pressure changes, the EZ-3 also provides a

means for making such adjustments. While the primary aircraft altimeter is adjusted

using a scale calibrated in “inches of mercury” (i.e., 29.92), the EZ-3 is adjusted to agree

with the altitude shown on the primary altimeter.

9.1.1 Elevation (Baro) Set

When the EZ-3 system is turned on the LCD screen will

display an ELEV SET (elevation set) message or an ALT

SET message depending on whether the airspeed is

below or above flight speed, respectively – i.e., whether

the plane is on the ground or flying. The initial elevation

should be set to be as close to that of the airfield

elevation as possible. Any difference will be the result of

barometer changes since the system was last used.

Rotating the encoder knob will change the elevation in 5 foot increments, and it

should be set to be as close to the actual airfield elevation as possible, in feet.

This will assure that the internal system altimeter will agree closely with the

aircraft altimeter. In practice, during preflight checks the pilot will set the aircraft

altimeter using a current barometer setting. The aircraft altimeter will then be

indicating the current elevation. The EZ-3 ELEV SET should be set to agree with

the corrected aircraft altimeter.

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Trio-avionics EZ Altitude Control Manuel d'utilisateur Page 25

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