DOC AIRBUS | AMM A320FAVIONICS COMPARTMENT LIGHTING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The avionics compartment lighting system consists of six lights, five 28 VDC outlets and three 115 VAC outlets.
** ON A/C NOT FOR ALL The avionics compartment lighting system consists of six lights, five 28 VDC outlets and three 115 VAC outlets.
2. Component Location
** ON A/C NOT FOR ALL 
Avionics Compartment Lighting - Component Location| _______________________________________________________________________________ |
| FIN ! FUNCTIONAL DESIGNATION ! PANEL!ZONE!ACCESS ! ATA |
| ! ! ! ! DOOR ! REF. |
| ------------------------------------------------------------------------------- |
| 6LS LT-DOME, AVIONICS COMPT FWD R 122 811 33-35-11 |
| 7LS LT-DOME, AVIONICS COMPT FWD L 121 811 33-35-11 |
| 8LS LT-DOME, AVIONICS COMPT LAT R 126 822 33-35-11 |
| 9LS LT-DOME, AVIONICS COMPT AFT L 127 824 33-35-11 |
| 10LS LT-DOME, AVIONICS COMPT AFT R 128 824 33-35-11 |
| 11LS C/B LIGHTING, AVNCS COMPT 122VU 212 |
| 12LS C/B LIGHTING, AVNCS COMPT 122VU 212 |
| 13LS OUTLET-AVIONICS COMPT, AFT L 127 824 |
| 14LS OUTLET-AVIONICS COMPT, AFT R 128 824 |
| 15LS OUTLET-AVIONICS COMPT, FWD L 121 811 |
| 16LS OUTLET-AVIONICS COMPT, LATERAL R 126 822 |
| 17LS OUTLET-AVIONICS COMPT, AFT R 128 824 |
| 18LS OUTLET-AVIONICS COMPT, LATERAL R 126 822 |
| 19LS OUTLET-AVIONICS COMPT, FWD R 122 811 |
| 20LS OUTLET-AVIONICS COMPT, LATERAL L 125 812 |
| 22LS LT-DOME, AVIONICS COMPT LAT L 125 812 33-35-11 |
| 23LS P/B SW-AVIONICS COMPT LT 50VU 212 |
| 24LS RELAY-PWR SPLY, AVIONICS COMPT 103VU 126 |
| AFT L DOME LIGHT |
| 25LS RELAY-PWR SPLY, AVIONICS COMPT 103VU 126 |
| FWD R DOME LIGHT |
3. System Description
The avionics compartment lighting system consists of a number of lights and maintenance outlets. The busbar 601PP supplies the five maintenance outlets with 28 VDC through circuit breaker 11LS. The busbar 216XP supplies the three maintenance outlets with 115 VAC through circuit breaker 12LS. The outlets are located in the forward and aft parts of the avionics compartement.
Six dome lights provide the illumination of the avionics compartment.
The busbar 601PP supplies the lights with 28 VDC through circuit breaker 1LS and relays 24LS and 25LS. The relay 24LS controls the power supply to the lateral L, aft L and R dome lights. The relay 25LS controls the power supply to the lateral R, forward L and R dome lights. The door proximity switches transmit the ground signal to relays 24LS and 25LS.
** ON A/C NOT FOR ALL The avionics compartment lighting system consists of a number of lights and maintenance outlets. The busbar 601PP supplies the five maintenance outlets with 28 VDC through circuit breaker 11LS. The busbar 216XP supplies the three maintenance outlets with 115 VAC through circuit breaker 12LS. The outlets are located in the forward and aft parts of the avionics compartement.
Six dome lights provide the illumination of the avionics compartment.
The busbar 601PP supplies the lights with 28 VDC through circuit breaker 1LS and relays 24LS and 25LS. The relay 24LS controls the power supply to the lateral L, aft L and R dome lights. The relay 25LS controls the power supply to the lateral R, forward L and R dome lights. The door proximity switches transmit the ground signal to relays 24LS and 25LS.
4. Operation/Control and Indicating
If the conditions below are obeyed:
If the conditions below are obeyed:
- busbar energized,
- circuit breaker 1LS closed,
- all avionics compartment doors closed,
- the two relays 24LS and 25LS energized,
A. Auto Mode
(1) When the service door in zone 125 or zone 128 is open, the associated proximity switch removes the ground for relay 24LS. Relay 24LS de-energizes and the L lateral, L and R aft dome lights come on.
(2) When the service door in zone 120 or zone 126 is open, the associated proximity switch removes the ground for relay 25LS. Relay 25LS de-energizes and the R lateral, L and R forward dome lights come on.
B. Manual Mode
When the pushbutton switch 23LS is pressed, the two relays 24LS and 25LS de-energize and the avionics compartment lights come on. The integral light in the pushbutton switch comes on.
When the pushbutton switch 23LS is pressed, the two relays 24LS and 25LS de-energize and the avionics compartment lights come on. The integral light in the pushbutton switch comes on.