Trio Avionics EZ Altitude Control - Manual (Page 6)

6
ALT
UP
ADJUST
ALT
DOWN
ADJUST
The system will then immediately release the elevators from servo control and enter the
READY mode. Turning off power to the unit will also release the servo.
3.2.1 Fine Adjustments to Altitude - While flying with the ALT HOLD engaged,
the ENCODER knob may be used to dial in very fine corrections to the engaged
altitude. Rotating the knob clockwise will cause an altitude increase (and cause
the LCD to indicate “ALT UP ADJUST”), while rotating the knob
counterclockwise will result in an altitude decrease and corresponding display.
Each “click” of the rotating knob will change the altitude by approximately 5 feet,
up or down, depending on the direction of rotation. When the altitude change is
completed, the green ALT HOLD display will appear. Alternatively, the encoder
knob may be pressed at any time to stop the adjust feature.
3.2.2 ADJUST TRIM Annunciator – As the flight progresses the aircraft may
require occasional trim changes as the fuel burn lightens the aircraft, or if the
throttle setting is changed. The servo will hold the proper altitude in all but
extreme out-of-trim conditions, but it is prudent to keep the aircraft properly
trimmed to avoid sudden excursions when the servo is disengaged.
The EZ-1 will sense when the aircraft is out of trim. If
the out-of-trim condition is minor it will not alert the
pilot. However, when the out-of-trim forces on the
servo exceed a predetermined amount, it will present a
message (flashing up or down arrows) to the pilot
advising that the aircraft trim should be adjusted. The
arrows on the display indicate the required direction of
trim adjustment. The altitude will be maintained even
though this alert is present.
When a trim adjustment is sensed by the computer the
“Trim” message will be removed, and the normal ALT
HOLD message will return
. Pressing the ENCODER
switch while the “Trim” message is present will erase
the message, remove the trim correction provided by
the system and replace it with the ALT HOLD
message. If the out of trim condition remains after a
correction has been made, or the message has been
cleared the message will return in a short period of time.
Probably the quickest way to eliminate the out-of-trim condition is to momentarily
disconnect the ALT HOLD function by pressing the LCD switch, re-trim the
aircraft for level flight, and then reengage the ALT HOLD.
The EZ altitude control system is available with an automatic trim option which
will automatically trim the aircraft to remove any trim errors. This feature will
control a separate trim motor (customer provided) such as the Ray Allen
Corporation model T3-12A or similar motor.
NOTE – If the ADJ TRIM arrows appear on the LCD, but when the ALT HOLD is released there is
very little trim correction required to the aircraft, the SYSTEM GAIN setting is probably too low, not
allowing the system to properly control the aircraft. See section 6.0 for proper adjustment of the
SYSTEM GAIN setting,
TRM
DWN
TRM
UP