Avionics News May 2022 - 56

Roll Command
--..V
Heading
Reference
Navigation
Coupler
Summing
Junction
Amplifier
Main Roll
Reference
--..V
Trim Adjust
Figure 2. A full-featured single-axis autopilot
able to stay level, hold a bank, and
follow a heading or a navigation course.
+-..V
Aileron
Control cable
Servo
Command from
navigation system
+-..V
THEORY & PRACTICE
Continued from page 55
actual flight, these voltages and the aileron movements may
be small. Autopilots are good at reacting to small changes and
making quick corrections.
Single-axis roll
A common autopilot on small aircraft is a single-axis
autopilot designed to control roll. Most aircraft are quite
stable in pitch and yaw. As a result, keeping the wings level
can be a great workload reducer for the pilot.
Figure 1 depicts a single-axis autopilot. There are many
configurations of autopilots. The only constant is the servo,
which must be located close to the control cables, pushrods
or hydraulic boosters. Even then, I've worked on aircraft with
roll servos located under the floor, in the wing, behind the
instrument panel, and even in the wheel well.
The top of Figure 1 shows an airplane flying level. No
reference voltage is produced, so there is nothing to be
amplified. The servo doesn't move and neither does the
aileron. The bottom half of the figure shows a situation where
the aircraft is in a bank. Now, the reference is producing an
error voltage, which gets amplified to 24V in this case, and is

Avionics News May 2022

Table of Contents for the Digital Edition of Avionics News May 2022

Avionics News May 2022 - Intro
Avionics News May 2022 - Cover1
Avionics News May 2022 - Cover2
Avionics News May 2022 - 1
Avionics News May 2022 - 2
Avionics News May 2022 - 3
Avionics News May 2022 - 4
Avionics News May 2022 - 5
Avionics News May 2022 - 6
Avionics News May 2022 - 7
Avionics News May 2022 - 8
Avionics News May 2022 - 9
Avionics News May 2022 - 10
Avionics News May 2022 - 11
Avionics News May 2022 - 12
Avionics News May 2022 - 13
Avionics News May 2022 - 14
Avionics News May 2022 - 15
Avionics News May 2022 - 16
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Avionics News May 2022 - 18
Avionics News May 2022 - 19
Avionics News May 2022 - 20
Avionics News May 2022 - 21
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Avionics News May 2022 - 24
Avionics News May 2022 - 25
Avionics News May 2022 - 26
Avionics News May 2022 - 27
Avionics News May 2022 - 28
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Avionics News May 2022 - 48
Avionics News May 2022 - 49
Avionics News May 2022 - 50
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Avionics News May 2022 - 53
Avionics News May 2022 - 54
Avionics News May 2022 - 55
Avionics News May 2022 - 56
Avionics News May 2022 - 57
Avionics News May 2022 - 58
Avionics News May 2022 - 59
Avionics News May 2022 - 60
Avionics News May 2022 - 61
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Avionics News May 2022 - 63
Avionics News May 2022 - 64
Avionics News May 2022 - Cover3
Avionics News May 2022 - Cover4
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