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light does not operate
correctly.
Circuit-breaker not set.
Dimmer switch defective.
Solid state inverter defective.
Light strip defective.
Defective wiring.
Set the circuit-breaker.
Replace the dimmer switch.
Replace the solid state
inverter.
Replace the light strip.
Do a continuity check of the
wiring. Repair/replace
defective wiring. Refer to
Chapter 92 for the wiring
diagrams.
The instrument lights do not
operate correctly.
Filament(s) defective.
Circuit-breaker not set.
Dimmer switch defective.
Defective wiring.
Replace the filament(s).
Set the circuit-breaker.
Replace the dimmer switch.
Do a continuity check of the
wiring. Repair/replace
defective wiring. Refer to
Chapter 92 for the wiring
diagrams.
AIRCRAFT
Lights DA 40 Series
AMM
Page 102
20 Sep 2007 33-10-00 Doc # 6.02.01
Rev. 5
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AIRCRAFT
DA 40 Series
AMM
Lights
Doc # 6.02.01
Rev. 5 33-10-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to remove/install the main components of the flight
compartment lighting systems. Refer to the Chapter 92 for the wiring diagrams.
2. Remove/Install a Cabin Light Assembly
A. Remove a Reading Light Assembly
Detail Steps/Work Items Key Items/References
(1) Pull the circuit-breaker for the reading light. Instrument panel, right side.
(2) Remove the reading light assembly:
S Release the spring clip which holds the light
assembly in position.
S Lower the light assembly from cockpit roof
and disconnect the electrical cable.
S Move the light assembly clear of the airplane.
Hold the reading light assembly.
At the switch end of the assembly.
At the in-line connector.
B. Install a Reading Light Assembly
Detail Steps/Work Items Key Items/References
(1) Move the reading light assembly into position in
the cockpit.
Hold the reading light assembly.
(2) Connect the electrical cable to the light assembly. At the in-line connector.
(3) Move the light assembly into position, lamp end
first, then push the switch end up into position
until the spring clip engages.
Make sure that the light assembly is
correctly installed and that the spring
clip is fully engaged.
AIRCRAFT
Lights DA 40 Series
AMM
Page 202
20 Sep 2007 33-10-00 Doc # 6.02.01
Rev. 5
3. Replace a Filament in a Reading Light Assembly
Detail Steps/Work Items Key Items/References
(1) Remove the reading light assembly. Refer to Paragraph 2.A.
(2) Remove the filament holder from the rear of the
light assembly.
(3) Replace the filament.
(4) Install the filament holder at the rear of the light
assembly.
(5) Install the reading light assembly. Refer to Paragraph 2.B.
4. Remove/Install a Dimmer Switch
A. Remove a Dimmer Switch
Detail Steps/Work Items Key Items/References
(1) Remove the top engine cowling. Refer to Section 71-10 (Lycoming
version) or 71-11 (TAE version).
(2) Disconnect the battery. Refer to Section 24-31 (Lycoming
version) or 24-34 (TAE version).
(3) Remove the instrument panel cover. Refer to Section 25-10.
(4) Remove the knob from the dimmer switch that
you will remove.
(5) Disconnect the electrical wiring from the rear of
the dimmer switch.
(6) Remove the nut and washer from the front of the
dimmer switch.
(7) Move the dimmer switch forward and move it
clear of the instrument panel.
AIRCRAFT
DA 40 Series
AMM
Lights
Doc # 6.02.01
Rev. 5 33-10-00 Page 203
20 Sep 2007
B. Install a Dimmer Switch
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.
　
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