CHAPTER 76
ENGINE CONTROLS
% Section 76-00 % Engine Controls - Lycoming Engine
1. General
% This Section tells you about the DA 40 engine controls for airplanes with the Lycoming engine
% installed. Bowden cables transmit the control inputs to the engine. For data on the propeller control system refer to Section 61-20.
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 71-60.
The DA 40 has these engine controls:
) Throttle control lever.
) Mixture control lever.
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AIRCRAFT AMM
Spring Washers
Plastic Washers
Throttle Friction Adjuster
Spacers
Mixture Lever
Stators
Mixture Lock-out
Toothed Segment
THROTTLE FRICTION
Throttle Lever
Mixture Bowden Cable Pivot Shaft
Stator Plates
Throttle Bowden
Cable
Figure 1: Engine Controls in the Cockpit
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Engine Controls
AMM
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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AIRCRAFT AMM
KnobNut
Throttle Lever
Washer Nut
Allen Bolt Bolt
COCKPIT CONTROL
Front Adjustment Nut for Outer Sheath
Rear Adjustment Nut
Throttle
for Outer Sheath
Cable Throttle Cable
FIREWALL
Split Bush
FEED-THROUGH
Split Shield
Pop Rivet
Throttle Cable
Rear Adjustment Nut
for Outer Sheath
Front Adjustment Nut
for Outer Sheath
Lock-nut
Nut Washer Bolt
RH SIDE OF FUEL INJECTOR ON THE ENGINE
Figure 2: Throttle Control Installation
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Engine Controls
AMM
B. Throttle
Figure 2 shows the throttle control installation.
The throttle control lever sets the position of the throttle lever on the fuel injector. Move the throttle control lever fully forward to open the throttle on the injector and move it rearward to close the throttle on the injector. The lever on the injector 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 fuel injector 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.
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