CIRRUS
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
FLIGHT COMPARTMENT
1. DESCRIPTION
Flight compartment interior lighting consists of instrument lights, glareshield flood lights, overhead dome
light, individual reading lights, pilot control lights, CAPS handle light, alternate air control light, circuit
breaker panel lights, and interior footwell lights. (See Figure 33-101)
A. Instrument Lighting
Instrument lighting for the airplane consists of dimmable incandescent lights in the instrument bezels.
The lights are controlled through the INSTRUMENT control knob on the bolster switch panel. Rotating
the knob clockwise energizes the lights and increases brightness. The lights are powered by 28 VDC
supplied through the 2-amp INST LIGHTS circuit breaker on Main Bus 1.
B. Glareshield Light Strip
A string of dimmable LEDs mounted under the instrument panel glareshield provide flood lighting for
the instrument panel. The LEDs are controlled through the PANEL control knob on the bolster switch
panel. Rotating the knob clockwise energizes the lights and increases brightness. The LEDs are powered by 28 VDC supplied through the 3-amp CABIN LIGHTS circuit breaker on Main Bus 2.
C. Cabin Dome Light
Serials 1005 thru 2015, 2016 & subs w/o Perspective Avionics: General cabin lighting is provided by a
dimmable dome light located in the headliner at the approximate center of the cabin. The light is controlled through the OVERHEAD control knob on the bolster switch panel. Rotating the knob clockwise
energizes the light and increases brightness. The light is powered by 28 VDC supplied through the 3amp CABIN LIGHTS circuit breaker on Main Bus 2.
Serials 2016 & subs w/ Perspective Avionics and w/o Convenience Lighting: General cabin lighting is
provided by a dome light located in the headliner at the approximate center of the cabin. The light is
controlled by a ceiling-mounted switch and is powered by 28 VDC supplied through the 5-amp CABIN
LIGHTS circuit breaker on Main Bus 1.
Serials 2303 & subs w/ Convenience Lighting: General cabin lighting is provided by a dome light
located in the headliner at the approximate center of the cabin. The light is part of the convenience
lighting system and is controlled via wireless keyfob or cabin light switch located on the cabin headliner. When the switch is in the AUTO position, the cabin dome light turns on when either cabin door is
opened or the doors are unlocked via the wireless keyfob and turns off when both doors are closed or
the doors are locked via the wireless keyfob. 28 VDC for cabin dome light operation is supplied
through the 3-amp CONV LIGHTS circuit breaker on the CONS Bus.
For maintenance practices related to passenger compartment convenience lighting, see Passenger
Compartment section of Lights. (Refer to 33-20)
For maintenance practices related to entry step convenience lighting, see Exterior Lighting section of
Lights. (Refer to 33-40)
For maintenance practices related to the convenience system controller, see Electrical Load Distribution section of Electrical Power. (Refer to 24-50)
D. Cabin Eyeball Lights
Individual eyeball-type reading lights are installed in the headliner above each passenger position.
Each light is aimed by positioning the lens in the socket and is controlled by a push-button switch
located next to the light. The pilot and copilot reading lights are dimmable through the PANEL control
knob on the bolster switch panel. Rotating the knob clockwise increases brightness.
Serials 1005 & subs w/o Perspective Avionics: The lights are powered by 28 VDC supplied through the
3-amp CABIN LIGHTS circuit breaker on Main Bus 2.
Serials 2016 & subs w/ Perspective Avionics: The lights are powered by 28 VDC supplied through the
5-amp CABIN LIGHTS circuit breaker on Main Bus 1.
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CIRRUS
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
E. Pilot Control Lights
Pilot control lights are installed in the headliner aft of the magnetic compass and provide light for the
control yoke, environmental controls and engine control quadrant. Lighting is provided by two dimmable super-bright LEDs. The LEDs are controlled through the OVERHEAD control knob on the bolster
switch panel. Rotating the knob clockwise energizes the lights and increases brightness. The LEDs
are powered by 28 VDC supplied through the 3-amp CABIN LIGHTS circuit breaker on Main Bus 2.
F.
CAPS Handle Lighting
Serials 1005 thru 1422: CAPS handle lighting is provided by two super-bright LEDs. The LEDs are
powered by 28 VDC supplied through the 3-amp CABIN LIGHTS circuit breaker on Main Bus 2.
Serials 1423 & subs: CAPS handle lighting is provided by two super-bright LEDs. Light strip diffusers
are connected to the LEDs to provide Illumination around the CAPS handle. The LEDs are powered by
28 VDC supplied through the 3-amp CABIN LIGHTS circuit breaker on Main Bus 2.
G. Alternate Air Control Light
Alternate air control lighting is provided by one dimmable super-bright LED. The LED is controlled
through the INSTRUMENT control knob on the bolster switch panel. Rotating the knob clockwise energizes the lights and increases brightness. The LED is powered by 28 VDC supplied through the 3-amp
CABIN LIGHTS circuit breaker on Main Bus 2.
H. Circuit Breaker Panel Lighting
Serials 1005 thru 2015, 2016 & subs w/o Perspective Avionics: Circuit breaker panel lighting is provided by six dimmable super bright LEDs. The LEDs are controlled through the INSTRUMENT control
knob on the bolster switch panel. Rotating the knob clockwise energizes the lights and increases
brightness. The LEDs are powered by 28 VDC supplied through the 3-amp CABIN LIGHTS circuit
breaker on Main Bus 2.
Serials 2016 & subs w/ Perspective Avionics: Circuit breaker panel lighting is provided by four dimmable super bright LEDs. Light strip diffusers are connected to the LEDs to provide Illumination at the circuit breaker panel. The LEDs are controlled through the INSTRUMENT control knob on the bolster
switch panel. Rotating the knob clockwise energizes the lights and increases brightness. The LEDs
are powered by 28 VDC supplied through the 3-amp CABIN LIGHTS circuit breaker on Main Bus 2.
I.
Interior Footwell Lighting - Serials 2303 & subs w/ Convenience Lighting
LED light assemblies are installed in the LH and right RH kick plates and are controlled via wireless
keyfob or cabin light switch located on the cabin headliner. When the switch is in the AUTO position,
the interior footwell lights turn on when either cabin door is opened or the doors are unlocked via the
wireless keyfob and turn off when both doors are closed or the doors are locked via the wireless keyfob. 28 VDC for convenience light operation is supplied through the 3-amp CONV LIGHTS circuit
breaker on the CONS Bus.
For maintenance practices related to passenger compartment convenience lighting, see Passenger
Compartment section of Lights. (Refer to 33-20)
For maintenance practices related to entry step convenience lighting, see Exterior Lighting section of
Lights. (Refer to 33-40)
For maintenance practices related to the convenience system controller, see Electrical Load Distribution section of Electrical Power. (Refer to 24-50)
The LEDs used for interior lighting are either red (Serials 1005 thru 1885) or orange (Serials 1886 & subs).
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CIRRUS
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
CAPS HANDLE LIGHTS
CABIN DOME LIGHT
EYEBALL LIGHTS
& SWITCHES
EYEBALL LIGHTS
& SWITCHES
GLARESHIELD
LIGHT STRIP
BOLSTER PANEL
DIMMER
SWITCHES
PILOT CONTROL
LIGHTS
ALTERNATE
AIR CONTROL
LIGHT
KICK PLATE
LIGHTS
CIRCUIT BREAKER
PANEL LIGHTS
SR20_MM33_1093C
Figure 33-101
Cabin Light Location
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CIRRUS
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
2. TROUBLESHOOTING
Trouble
Eyeball lights inoperative.
Cabin dome light inoperative.
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Probable Cause
Remedy
BAT 1 switch in OFF position.
Set BAT 1 switch to ON position.
Dimmer switch in OFF position.
Set dimmer switch to ON position.
Defective bulb.
Replace bulb.
Circuit breaker or switch tripped.
Reset circuit breaker. Inspect for
short circuit.
Circuit breaker switch defective.
Check switch for continuity.
Replace if defective.
Loose electrical connection.
Tighten electrical connection.
Defective power supply.
Replace power supply.
Battery defective.
Replace battery.
BAT 1 switch in OFF position.
Set BAT 1 switch to ON position.
Dimmer switch in OFF position.
Set dimmer switch to ON position.
Defective bulb.
Replace bulb.
Circuit breaker or switch tripped.
Reset circuit breaker. Inspect for
short circuit.
Circuit breaker switch defective.
Check switch for continuity.
Replace if defective.
Loose electrical connection.
Tighten electrical connection.
Defective power supply.
Replace power supply.
Battery defective.
Replace battery.
EFFECTIVITY:
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CIRRUS
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
3. MAINTENANCE PRACTICES
A. Cabin Lights (See Figure 33-102)
(1)
Removal - Glareshield Light Strip
(a) Pull CABIN LIGHTS circuit breaker.
(b) Remove glareshield. (Refer to 25-10)
(c)
Remove light strip from retaining clips.
(d) Remove screws securing clips to glareshield.
(2) Installation - Glareshield Light Strip
(a) Position clips to glareshield and secure with screws.
(b) Position light strip to glareshield and secure with clips.
(c)
Install glareshield. (Refer to 25-10)
(d) Reset CABIN LIGHTS circuit breaker.
(e) Verify proper operation of lights.
(3) Removal - Cabin Eyeball Light and Switch
(a) Pull CABIN LIGHTS circuit breaker.
(b) Remove cabin headliner. (Refer to 25-10)
(c)
Identify and disconnect cabin eyeball light and switch wire harnesses.
(d) Depress mounting tabs and remove eyeball light and switch from headliner.
(4) Installation - Cabin Eyeball Light and Switch
(a) Depress mounting tabs and install eyeball light and switch to headliner.
(b) Connect eyeball light and switch wire harnesses.
(c)
Install cabin headliner. (Refer to 25-10)
(d) Reset CABIN LIGHTS circuit breaker.
(e) Verify proper operation of light and switch.
(5) Removal - Cabin Dome Light
(a) Serials 1005 & subs w/o Convenience Lighting: Pull CABIN LIGHTS circuit breaker.
(b) Serials 2303 & subs w/ Convenience Lighting: Pull CONV Lights circuit breaker.
(c)
Gently pry lens off of light base.
(d) Remove cabin headliner. (Refer to 25-10)
(e) Identify and disconnect cabin dome light wire harness.
(f)
Remove screws and nuts securing dome light to cabin headliner.
(6) Installation - Cabin Dome Light
(a) Position dome light to headliner and secure with screws and nuts.
(b) Connect dome light wire harness.
(c)
Install cabin headliner. (Refer to 25-10)
(d) Secure lens to dome light.
(e) Serials 1005 & subs w/o Convenience Lighting: Reset CABIN LIGHTS circuit breaker.
(f)
Serials 2303 & subs w/ Convenience Lighting: Reset CONV LIGHTS circuit breaker.
(g) Verify proper operation of light.
(7) Removal - CAPS Handle Lighting
(a) Pull CABIN LIGHTS circuit breaker.
(b) Remove CAPS handle cover.
(c)
Verify CAPS handle safety pin is installed to prevent accidental discharge of CAPS rocket.
(d) Remove cabin headliner. (Refer to 25-10)
(e) Disconnect LED light assembly from wire harness.
(f)
Serials 1005 thru 1422: Remove epoxy securing LEDs to cabin headliner.
(g) Serials 1423 & subs: Disconnect light strip diffusers from LED light assembly.
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CIRRUS
(8)
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
(h) Remove LED light assembly from cabin headliner.
Installation - CAPS Handle Lighting
(a)
Serials 1005 thru 1422: Acquire necessary tools, equipment, and supplies.
Description
Epoxy Adhesive
P/N or Spec.
5 Minute Epoxy
Supplier
Devcon
Purpose
Secure LEDs.
(b) Serials 1005 thru 1422: Position LEDs to cabin headliner and secure with 5 minute epoxy.
(c)
Serials 1423 & subs: Connect light strip diffusers to LED light assembly.
(d) Connect LED light assembly to wire harness.
(e) Install cabin headliner. (Refer to 25-10)
(f)
Install CAPS handle cover.
(g) Reset CABIN LIGHTS circuit breaker.
(h) Verify proper operation of lights.
(9) Removal - Circuit Breaker Panel Lighting - Serials 1005 thru 2015, 2016 & subs w/o Perspective
Avionics
(a) Pull CABIN LIGHTS circuit breaker.
(b) Remove left mid console circuit breaker trim. (Refer to 25-10)
(c)
Remove epoxy securing LEDs to mounting brackets.
(d) Disconnect LED light assembly from wire harness.
(e) Remove LED light assembly from airplane.
(10) Installation - Circuit Breaker Panel Lighting - Serials 1005 thru 2015, 2016 & subs w/o Perspective Avionics
(a)
Acquire necessary tools, equipment, and supplies.
Description
Epoxy Adhesive
P/N or Spec.
5 Minute Epoxy
Supplier
Devcon
Purpose
Secure LEDs.
(b) Position LEDs to mounting brackets and secure with 5 minute epoxy.
(c)
Push each of the six LEDs into the circuit breaker panel lighting brackets.
(d) Connect LED light assembly to wire harness.
(e) Install left mid console circuit breaker trim. (Refer to 25-10)
(f)
Reset CABIN LIGHTS circuit breaker.
(g) Verify proper operation of lights.
(11) Removal - Circuit Breaker Panel Lighting - Serials 2016 & subs w/ Perspective Avionics
(a) Pull CABIN LIGHTS circuit breaker.
(b) Disconnect light strip diffusers from LED light assembly.
(c)
To disconnect LED diode, use a solder gun and remove solder from each diode lead.
(12) Installation - Circuit Breaker Panel Lighting - Serials 2016 & subs w/ Perspective Avionics
(a) Identify corresponding wires and place heat shrink tubing into position. Solder each wire to
corresponding lead on LED diode.
(b) Apply heat to heat shrink tubing.
(c)
Connect light strip diffusers to LED light assembly.
(d) Reset CABIN LIGHTS circuit breaker.
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AIRPLANE MAINTENANCE MANUAL
MODEL SR20
(e) Verify proper operation of lights.
(13) Removal - Alternate Air Control Light
(a) Remove left bolster trim. (Refer to 25-10)
(b) Disconnect LED light assembly from wire harness.
(c)
Remove epoxy securing LED light assembly to bolster trim. Remove LED light assembly
from airplane.
(14) Installation - Alternate Air Control Light
(a)
Acquire necessary tools, equipment, and supplies.
Description
Epoxy Adhesive
P/N or Spec.
5 Minute Epoxy
Supplier
Devcon
Purpose
Secure LED.
(b) Position LED to left bolster trim and secure with 5 minute epoxy.
(c)
Connect LED light assembly to wire harness.
(d) Install left bolster trim. (Refer to 25-10)
(e) Verify proper operation of light.
(15) Removal - Pilot Control Lights
(a) Pull CABIN LIGHTS circuit breaker.
(b) Remove cabin headliner. (Refer to 25-10)
(c)
Disconnect LED light assembly from wire harness.
(d) Remove epoxy securing LEDs to cabin headliner. Remove LED light assembly from airplane.
(16) Installation - Pilot Control Lights
(a)
Acquire necessary tools, equipment, and supplies.
Description
Epoxy Adhesive
P/N or Spec.
5 Minute Epoxy
Supplier
Devcon
Purpose
Secure LEDs.
(b) Position LED to cabin headliner and secure with 5 minute epoxy.
(c)
Connect LED light assembly to wire harness.
(d) Install cabin headliner. (Refer to 25-10)
(e) Reset CABIN LIGHTS circuit breaker.
(f)
Verify proper operation of lights.
(17) Removal - Interior Footwell Lighting - Serials 2303 & subs w/ Convenience Lighting
(a) Set BAT 1, BAT 2, and AVIONICS switches to OFF positions.
(b) Pull CONV LIGHTS circuit breaker.
(c)
Remove kick plate. (Refer to 25-10)
(d) Remove nut securing LED lampholder to kick plate.
(e) Unscrew LED from LED lampholder and remove from airplane.
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AIRPLANE MAINTENANCE MANUAL
MODEL SR20
(18) Installation - Interior Footwell Lighting - Serials 2303 & subs w/ Convenience Lighting
(a) Acquire necessary tools, equipment, and supplies.
Description
Loctite®
(b)
(c)
(d)
(e)
(f)
(g)
(h)
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P/N or Spec.
242
Supplier
Any Source
Apply Loctite® to threads of LED lampholder.
Secure LED lampholder to kick plate with nut.
Apply Loctite® to threads of LED.
Screw LED into LED lampholder.
Install kick plate. (Refer to 25-10)
Reset CONV lights circuit breaker.
Verify proper operation of light.
EFFECTIVITY:
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Purpose
LED assembly installation.
CIRRUS
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
BOLSTER PANEL
(REF)
1
FUEL
LFE
T
RI
GLARESHIELD
(REF)
2
CAPS HANDLE
(REF)
CAPS HANDLE
(REF)
1
1
HEADLINER
(REF)
2
Serials 1423 & subs.
Serials 1005 thru 1422.
LEGEND
1. Wire Harness
2. Light Strip Diffuser
SR20_MM33_1799B
Figure 33-102
Cabin Lights (Sheet 1 of 3)
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AIRPLANE MAINTENANCE MANUAL
MODEL SR20
CONSOLE ASSY
(REF)
11
CONSOLE ASSY
(REF)
6
9
2
1
1
Serials 1005 thru 2015,
2016 & subs w/o Perspective Avionics.
Serials 2016 & subs w/ Perspective Avionics.
5
7
LEGEND
1. Wire Harness
2. Light Strip
3. Grommet
4. Reading Light
5. Bulb
6. Bracket
7. Switch
8. Eyeball Light
9. Screw
8
HEADLINER
(REF)
Serials 1005 thru 2030.
7
12
1
HEADLINER
(REF)
Serials 1005 & subs.
SR20_MM33_1803C
Figure 33-102
Cabin Lights (Sheet 2 of 3)
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AIRPLANE MAINTENANCE MANUAL
MODEL SR20
1
5
10
HEADLINER
(REF)
3
9
4
DETAIL F
13
KICK PLATE
(REF)
10
14
LEGEND
1. Wire Harness
5. Bulb
9. Screw
10. Nut
12. Reading Light
13. LED Light Assembly
14. Lampholder
15. Lens
16. Cabin Dome Light
DETAIL G
Serials 2303 & subs.
SR20_MM33_4245
Figure 33-103
Cabin Lights (Sheet 3 of 3)
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AIRPLANE MAINTENANCE MANUAL
MODEL SR20
B. Dimmer Switch
(1)
(2)
(3)
(4)
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Removal - Dimmer Switch
(a) Remove LH kick plate. (Refer to 25-10)
(b) Remove left bolster trim. (Refer to 25-10)
(c)
Identify each wire to the switch and desolder wires.
(d) Remove nut and washer securing switch to bolster panel.
(e) Remove switch from bolster panel.
Installation - Dimmer Switch
(a) Position switch to bolster panel and secure with washer and nut.
(b) Solder wires to corresponding switch terminals.
(c)
Install left bolster trim. (Refer to 25-10)
(d) Install LH kick plate. (Refer to 25-10)
(e) Verify proper operation of switch.
Removal - Dimmer Circuit Card (See Figure 33-104)
(a) Remove LH crew seat. (Refer to 25-10)
(b) Remove LH kick plate. (Refer to 25-10)
(c)
Disconnect wiring harness from dimmer circuit card.
(d) Remove screws securing dimmer circuit card to console rib. Remove dimmer circuit card
from airplane.
Installation - Dimmer Circuit Card
(a) Position dimmer circuit card to console rib and secure with screws.
(b) Connect wiring harness to dimmer circuit card.
(c)
Install LH kick plate. (Refer to 25-10)
(d) Install LH crew seat. (Refer to 25-10)
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CIRRUS
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
2
1
CONSOLE RIB
(REF)
LEGEND
1. Dimmer Circuit Card
2. Screw
SR20_MM33_1904
Figure 33-104
Dimmer Circuit Card Installation
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AIRPLANE MAINTENANCE MANUAL
MODEL SR20
C. Bulb Replacement (See Figure 33-105)
CAUTION:
(1)
(2)
(3)
(4)
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Always wear clean cotton gloves when working with bulbs. Never allow glass portion of
bulb to come into contact with exposed skin. Oils from the exposed skin will cause premature bulb failure.
Removal - Cabin Eyeball Light Bulb
(a) Pull CABIN LIGHTS circuit breaker.
(b) Remove cabin headliner. (Refer to 25-10)
(c)
Rotate bulb and pull to remove bulb from socket.
Installation - Cabin Eyeball Light Bulb
(a) Position bulb to socket and rotate to secure.
(b) Install cabin headliner. (Refer to 25-10)
(c)
Reset CABIN LIGHTS circuit breaker.
(d) Verify proper operation of light.
Removal - Cabin Dome Light Bulb
(a) Serials 1005 & subs w/o Convenience Lighting: Pull CABIN LIGHTS circuit breaker.
(b) Serials 2303 & subs w/ Convenience Lighting: Pull CONV Lights circuit breaker.
(c)
Remove lens from dome light.
(d) Remove bulb from socket.
Installation - Cabin Dome Light Bulb
(a) Position bulb to socket and push to secure.
(b) Secure lens to dome light.
(c)
Serials 1005 & subs w/o Convenience Lighting: Reset CABIN LIGHTS circuit breaker.
(d) Serials 2303 & subs w/ Convenience Lighting: Reset CONV LIGHTS circuit breaker.
(e) Verify proper operation of light.
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CIRRUS
AIRPLANE MAINTENANCE MANUAL
MODEL SR20
1
2
3
1
HEADLINER
(REF)
2
4
5
7
6
LEGEND
1. Connector
2. Bulb
3. Nut
4. Cabin Dome Light
5. Screw
6. Lens
7. Eyeball Light
SR20_MM33_1076B
Figure 33-105
Interior Bulb Replacement
EFFECTIVITY:
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MODEL SR20