2.
Description and Operation ........................................ 3
Trouble-Shooting
1. General ..................................................... 101
Maintenance Practices
1.
General ..................................................... 201
2.
Remove/Install the Throttle Bowden Cable ......................... 201
3.
Remove/Install the Mixture Bowden Cable.......................... 207
4.
Throttle/Mixture Control Range of Movement Test.................... 213
DA 40 Series AMM
DA 40 F
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DA 40 F
CHAPTER 76 ENGINE CONTROLS
The title of Section 76-00 is amended to read:
Section 76-00 % Engine Controls - Lycoming IO-360-M1A Engine
DA 40 Series AMM
DA 40 F
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DA 40 F
Section 76-02
Engine Controls - Lycoming O-360-A4M Engine
1. General
This Section tells you about the DA 40 F engine controls for airplanes with the Lycoming O-360-A4M
engine installed. Bowden cables transmit the control inputs to the engine.
Figure 1 shows the engine control assembly.
This Chapter gives you data on the linkages cables and levers. It does not include data on the fuel
control units themselves. For data on the engine fuel-control unit refer to the Lycoming Maintenance
Manual. For data on the alternate air unit refer to Section 71-62.
The DA 40 F has these engine controls:
) Throttle control lever.
) Mixture control lever.
) Carburetor Heat control lever.
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DA 40 Series AMM
DA 40 F AIRCRAFT
Figure 1: Engine Controls in the Cockpit
DA 40 F
2. Description and Operation
Figure 1 shows the engine control assembly in the cockpit. Figures 2 and 3 show the details of each control. An engine control assembly in the center console holds the throttle, mixture and propeller control levers. The engine control assembly has a control lever friction-adjuster. Tubular spacers in the control assembly make the stops for the control levers.
A. Friction Adjuster
The friction adjuster adjusts the force necessary to move the control levers in the engine control assembly. The friction adjuster control knob is on the right side of the center console. The control levers attach to a pivot shaft in the engine control assembly. The pivot shaft also has stator plates, plastic washers and spacers. The other end of the stator plates attach to the control assembly with a bolt. The friction between the levers, plastic washers and stator plates increases when the friction adjuster control knob is tightened and decreases when the knob is released. Spring washers keep the friction adjuster control knob setting.
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DA 40 Series AMM
DA 40 F AIRCRAFT
Figure 2: Throttle Control Installation
DA 40 F
B. Throttle Control
Figure 2 shows the throttle control installation.
The throttle control lever sets the position of the throttle lever on the carburetor. Move the throttle control lever fully forward to open the throttle on the carburetor and move it rearward to close the throttle on the carburetor. The lever on the carburetor touches its stop before the control lever in the cockpit touches the cockpit stop. The cockpit stops prevent the pilot from putting too much load on the control system.
A Bowden cable connects between the throttle control lever in the cockpit and the carburetor 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 bracket attached to the sides of the engine control assembly.
The Bowden cable goes from the engine control assembly, 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.
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