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Trouble  Possible Cause  Repair 
One of the reading lights does not operate.  Defective filament. Defective light unit.  Replace the filament. Replace the light unit. 
The instrument panel flood 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  Filament(s) defective.  Replace the filament(s). 
operate correctly.  Circuit-breaker not set. Dimmer switch defective. Defective wiring.  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. 

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Lights
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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. 

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3.
Replace a Filament in a Reading Light Assembly

4.
Remove/Install a Dimmer Switch

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. 

A. Remove a Dimmer Switch
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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. 
　
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