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B. Install a Dimmer Switch
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DA 40 Series

Detail Steps/Work Items  Key Items/References 
(1)  Put the dimmer switch into position in the instrument panel. 
(2)  Install the washer and nut which attaches the dimmer switch to the instrument panel.  Make sure that the dimmer switch is orientated correctly. 
(3)  Connect the electrical wiring to the rear of the dimmer switch.  Refer to Chapter 92 for the wiring diagrams. 
(4)  Install the knob to the front of the dimmer switch. 
(5)  Install the instrument panel cover.  Refer to Section 25-10. 
(6)  Connect the airplane battery.  Refer to Section 24-31 (Lycoming version) or 24-34 (TAE version). 
(7)  Do an operational test of the dimmer switch: S Set the ALT/BAT switch (Lycoming version) or ELECTRIC MASTER key switch (TAE version) to ON. S Rotate the dimmer switch clockwise. S Rotate the dimmer switch fully clockwise. S Rotate the dimmer switch fully counter-clockwise to the OFF position. S Set the ALT/BAT switch (Lycoming version) or ELECTRIC MASTER key switch (TAE version) to OFF.  The system light(s) must come on. The intensity of the light(s) must increase. The light(s) must go off. 
(8)  Install the top engine cowling.  Refer to Section 71-10 (Lycoming version) or 71-11 (TAE version). 

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Section 33-40
Exterior Lights

1. General
This Section tells you about the exterior lights on the DA 40.
2. Description
The DA 40 has 3 exterior lights in one light unit at each wing-tip. It also has landing and taxi lights in a housing in the leading edge of the left wing. Figure 1 shows a wing-tip light unit.
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Strobe Light Power Unit

Retaining Cover
LH SHOWN
Figure 1: Wing-Tip Light Unit and Strobe Power Unit
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A. Position Lights
The DA 40 has left and right position lights. The front part of the light unit has a red (left) lens or green (right) lens. The light can be seen from the front or the side of the airplane.
The light unit also has rear position lights. The aft part of each light unit has a clear lens. The light can be seen from the rear of the airplane only.
A switch on the left instrument panel controls the position lights and the system is protected by a circuit-breaker.
B. Strobe Light (Anti Collision Light - ACL)
The middle part of each light unit has a clear lens for a strobe light. The filament gives a high intensity flash. This is followed immediately by a less-bright flash. The double flashes occur about 50 times per minute. The strobe lights can be seen from all round the airplane.
A separate power unit for each strobe light is mounted in the wing tip. A switch on the left instrument panel controls both the strobe lights and the system is protected by a circuit-breaker.
The power unit generates an electrical impulse of about 600 volts. The pulse ionizes the gas in the strobe light filament which causes a bright flash. A second less powerful flash occurs immediately after the main pulse.
C. Landing Light
The landing light is located in a housing in the leading edge of the left wing. The landing light has a clear lens and a 35 watt filament. It is located inboard in the housing. A switch on the left instrument panel controls the light and a circuit-breaker protects the system.
D. Taxi Light
　
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