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% Section 71-10 % Engine Cowlings - Lycoming Engine
1. General
The DA 40 has two glass fiber reinforced plastic (GFRP) panels which make the engine cowlings. A top cowling and a bottom cowling. GFRP is very strong and is easy to maintain. The cowlings give a good aerodynamic shape to the nose of the airplane. They are very easy to remove and give good access to the engine.
Refer to Section 51-20 for repair data for the cowlings. Refer to Section 51-60 for data on the quick-release fasteners.
2. Description
Figure 1 shows the cowlings.
Quick-release fasteners attach the cowlings to each other and to the fuselage. Both the cowlings are very light and one person can hold them easily.
The top cowling has a small access panel for the engine oil filler and dipstick. The access panel attaches to the top cowling with a hinge.
The bottom cowling has the air intakes. The left intake gives cooling air for the engine. The right intake supplies air for the engine, the oil cooler, cabin heating, battery cooling, and alternator cooling. A special “Y” connector attaches to the inside of the cowling at the oil cooler air intake. The “Y” connector supplies cooling air for the alternator and it supplies air for the exhaust-heat-exchanger. A quick-release fastener attaches the “Y” connector to the bottom cowling. The cowling has an air intake at the bottom-center for the fuel injector.
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Ring
Camloc Stud
Cooling Rubber Seal Receptacle Air Intake (8)
Figure 1: Engine Cowlings
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Trouble-Shooting
1. General
The table below lists the defects you could have with the engine cowlings. If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair in the Repair column.
Trouble Possible Cause Repair
Outer surface of the cowling discoloured. Paint blistered. Black soot on the inner surface. Engine overheating. Hot gas leak. Engine fire. Examine the engine for hot gas leaks. Examine the exhaust for cracks and leaking gaskets. Replaced damage items. Repaint the cowlings.
Oil/fuel on the inner surface of the cowling. Oil/fuel leak. Examine the engine. Look specially for oil/fuel leaks. Correct problems which you have found. Clean the cowling.
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Maintenance Practices
1. General
This section contains the maintenance practices for the cowlings. It tells you how to remove/install the cowlings. It also tells you how to clean and paint the cowlings.
2. Remove the Engine Cowlings
A. Remove the Top Cowling
Detail Steps/Work Items Key Items/References
(1) Release the quick-release fasteners which hold the top cowling. Refer to Figure 1.
(2) Pull the side of the cowling gently outwards and upwards.
(3) Move the top cowling away from the airplane.
B. Remove the Bottom Cowling
Detail Steps/Work Items Key Items/References
WARNING: YOU MUST MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU TURN THE PROPELLER. MAKE SURE THAT THE IGNITION SWITCH IS SET TO “OFF”. SET THE THROTTLE TO “IDLE” AND THE MIXTURE CONTROL TO “LEAN CUT-OFF”.
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