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19 Dec 1997
CHAPTER 76
ENGINE CONTROLS
Engine Controls
DA20-C1 AMM
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TABLE OF CONTENTS
CHAPTER 76-00 ENGINE CONTROLS...................................................................................................1
1. General .............................................................................................................................1
2. Description And Operation................................................................................................1
TROUBLE-SHOOTING.............................................................................................................. 101
1. General ........................................................................................................................ 101
MAINTENANCE PRACTICES ................................................................................................... 201
1. General ........................................................................................................................ 201
2. Remove/Install The Throttle Bowden Cable ................................................................ 201
3. Remove/Install The Mixture Control Bowden Cable.................................................... 206
4. Remove/Install The Alternate-Air Control Bowden-Cable ........................................... 214
5. Throttle/Mixture Control Range Of Movement Test..................................................... 218
6. Alternate Air Control Range Of Movement Test .......................................................... 223
Engine Controls
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CHAPTER 76-00
ENGINE CONTROLS
1. General
This Chapter tells you about DA20-C1 engine power controls and the alternate air control. Bowden
cables transmit the control inputs to the engine
Figure 1 shows the location of the engine controls.
This Chapter includes data on the linkages, cables and levers. It does not include data on the fuelcontrol
units themselves or the alternate air unit. For data on the engine fuel-control units refer to
the Teledyne Continental Motors IO-240B Maintenance Manual. For data on the alternate air unit
refer to Chapter 71-60.
The DA20-C1 has these controls:
− Throttle.
− Mixture.
− Alternate air
2. Description And Operation
Figure 1 shows the location and installation of the components in the cockpit. Figures 2 to 4 show
details of each control. A control quadrant in the center console holds the control levers. The
control quadrant has three control levers and a power-controls friction-adjuster. Tubular spacers in
the control quadrant make the stops for the control levers.
A. Throttle
The throttle controls the engine RPM from IDLE to FULL. The throttle lever is the center lever in
the control quadrant. A bowden cable connects between the throttle lever in the cockpit and the
throttle valve at the engine. The bowden-cable eye-end attaches to the throttle lever with a bolt.
The outer sheath of the bowden cable has a threaded end fitting. Two nuts attach the end fitting
to a tab bent from the side of the throttle quadrant.
The bowden cable goes from the center console, up behind the instrument panel and through
the firewall to the engine bay. A feed-thru fitting holds the cable in position at the firewall. A fire
resistant compound seals the bowden cable where it goes through the firewall.
Engine Controls
DA20-C1 AMM
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Figure 1: Engine Controls In The Cockpit
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From the firewall the bowden cable goes through a rubber grommet in the aft baffle on the right
hand side. A P-clamp holds the cable to the top right tube of the engine mounting frame. The
outer sheath of the bowden cable then attaches to a bracket on the top of the engine with two
nuts. The bracket holds the outer sheath of the bowden cable. If you adjust the two nuts, you
move the range of movement of the throttle lever.
The control-rod eye-end attaches to the throttle lever at the engine with a bolt, nut and three
washers. The eye end is adjustable. You can use it to set the correct range of movement of the
throttle valve.
B. Mixture Control
The mixture control sets the fuel mixture between RICH and LEAN. It also stops the fuel supply
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