Trio Avionics EZ Altitude Control - Manual (Page 9)

9
SERVO
CLTCH
SLIP
SERVO
CW
LIMIT
SERVO
CCW
LIMIT
airframe designer’s limitation regarding use of an autopilot system in
turbulent conditions. If an EZ altitude control system control problem is
suspected, turn off power to the system and contact Trio Avionics for
direction before further use.
3.5.5 Servo Clutch Slip
The EZ altitude control system incorporates an
important special safety feature: a clutch within the
servo that can be overridden when actived by moderate
manual stick or yoke pressure.
Sensors are provided
in the servo to detect slippage of the mechanical clutch
assembly. The message “SERVO CLTCH SLIP” will
appear as a flashing amber message if the condition is
sensed.
The clutch adjustment should be set during installation so that the system can
drive the elevator control system under normal conditions but be easily
overridden by a manual pilot input. Pilot override will force the clutch to slip,
allowing the pilot to take positive control away from the EZ-1 system in
emergency situations such as unexpected traffic. On the other hand, a clutch
slip message that appears for no apparent reason is probably due to the clutch
not being adjusted properly or by extreme out-of-trim conditions, thereby not
allowing the control system to be driven correctly.
System Response – the message “CLUTCH SLIP” will flash with amber
illumination. The message is advisory in nature and will not cause a
servo disconnect.
Pilot Action – If this message occurs under conditions other than a
manual servo override, the clutch adjustment should be checked to
ensure it is tight enough to drive the control system under normal
conditions including light to moderate turbulence and normal out of trim
conditions. However, you must assure that it is set loose enough that
the pilot can easily overcome it in an emergency.
3.5.4 Servo CW (or CCW) Limit
This red message indicates the servo crank arm has been
moved to a clockwise or counterclockwise position outside of
its normal range of operation. This error will result in an
immediate servo disconnect. The cause of this error is most
likely a manual system override by the pilot.
System response – immediate servo disconnect
and servo power down. Red SERVO CW (or CCW)
LIMIT message displayed.
Pilot Action – Determine the cause of the SERVO
CW (or CCW) LIMIT message. If not due to pilot
manual override, tighten the servo slip clutch to allow
greater servo control of the elevator system.