INSTRUMENT AND PANEL INTEGRAL LIGHTING - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General
The instrument and panel integral lighting permit the crew to read the indications on these panels and instruments during night flights or flights in stormy conditions.

** ON A/C NOT FOR ALL

2. Component Location

Instrument and Panel Integral Lighting - Component Location ** ON A/C NOT FOR ALL

-------------------------------------------------------------------------------

FIN I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I ATA

I I I I DOOR I REF.

-------------------------------------------------------------------------------

2LF SW-INT LT, STBY COMPASS 25VU 210

6LF CONTROLLER-LIGHTING 210 33-13-51

7LF POT-INT LT/OVHD INTEG LT 25VU 210

16LF CONTROLLER-LIGHTING 212 811 33-13-51

17LF POT-INTEG LT/MAIN PNL & PED 111VU 211

30LF CONTROLLER-LIGHTING 212 811 33-13-51

2FN COMPASS STANDBY 210

** ON A/C NOT FOR ALL

3. System Description
The integral lighting installed on the panels and the instruments has miniature lamps. These lamps are supplied by an alternating current with variable voltage from 0 to 5 volts.
Lighting controllers deliver this alternating current.
These lighting controllers generate a low voltage current source with high intensity from the 115V - 400Hz voltage.
A 470 ohms potentiometer provides the continuous adjustment of the output voltage between 0 and 5 efficient volts.
This output voltage is independent from the load.
The table below shows the main characteristics and the function of each lighting controller.

-------------------------------------------------------------------------------

! ! Lighting ! Supply ! Adjustment !

! Instrument ! Controller ! ! Potentiometer!

! and Panel !-------------------------------!------------!--------------!

! Integral ! Lighting ! Maximum ! Number ! Circuit ! Electrical !

! Lighting ! Controller ! Output ! of ! Breaker ! Identifier !

! ! Identifier ! Power ! Fuses ! Identifier ! !

!-----------------!------------!---------!--------!------------!--------------!

! Overhead Panel ! 6LF ! 180VA ! 6 ! 3LF ! 7LF !

!-----------------!------------!---------!--------!------------!--------------!

! Captain, First ! ! ! ! ! !

! Officer Main ! ! ! ! ! !

! Instrument ! ! ! ! ! !

! Panels ! 16LF ! 180VA ! 6 ! 4LF ! 17LF !

! Center ! ! ! ! ! !

! Instrument Panel! ! ! ! ! !

! Center Pedestal ! ! ! ! ! !

! Side Consoles ! ! ! ! ! !

!-----------------!------------!---------!--------!------------!--------------!

! Glareshields ! 30LF ! 25VA ! 3 ! 5LF ! 38LE !

! ! ! + 45VA ! ! ! !

-------------------------------------------------------------------------------

The integral lighting installed on the panels has LEDs, and the integral lighting installed on the instruments has miniature lamps.
Lighting controllers supply the LEDs with direct current and the lamps with alternating current.
These lighting controllers supply a low voltage current source with high intensity from the 115V - 400Hz voltage network.
A 470 ohms potentiometer is used for the continuous adjustment of the output voltage between 0 and 5 volts RMS.
This output voltage operates independently from the load.
The table that follow shows the primary properties and the function of each lighting controller.

----------------------------------------------------------------------

! ! Lighting ! Supply ! Adjustment !

! Instrument ! Controller ! ! Potentiometer!

! and Panel !----------------------!------------! !

! Integral ! Lighting ! Maximum ! Circuit ! Electrical !

! Lighting ! Controller ! Output ! Breaker ! Identifier !

! ! Identifier ! Power ! Identifier ! !

!-----------------!------------!---------!------------!--------------!

! Overhead Panel ! 6LF ! 220VA ! 3LF ! 7LF !

!-----------------!------------!---------!------------!--------------!

! Captain, First ! ! ! ! !

! Officer Main ! ! ! ! !

! Instrument ! ! ! ! !

! Panels, Center ! 16LF ! 220VA ! 4LF ! 17LF !

! Instrument ! ! ! ! !

! Panel, Center ! ! ! ! !

! Pedestal, Side ! ! ! ! !

! Consoles ! ! ! ! !

!-----------------!------------!---------!------------!--------------!

! Glareshields ! 30LF ! 155VA ! 5LF ! 38LE !

----------------------------------------------------------------------

A. Instrument and Panel Integral Lighting

Instrument and Panel Integral Lighting - Schematic ** ON A/C NOT FOR ALL

This lighting system has these circuits:

(1) Overhead panel integral lighting
It comprises:

a circuit breaker 3LF. The normal busbar 103XP supplies 115VAC/400Hz to this circuit breaker (panel 122VU),
a potentiometer 7LF used for the adjustment of the integral lighting brightness (panel 25VU),
a lighting controller 6LF. Its 6 outputs provide the integral lighting of the placards and the instruments on the overhead panel.

(2) Integral lighting of instrument panels, consoles and center pedestal
It comprises:

a circuit breaker 4LF. The normal busbar 103XP supplies 115VAC/400Hz to this circuit breaker (panel 122VU),
a potentiometer 17LF which provides the adjustment of the integral lighting brightness (panel 111VU),
a lighting controller 16LF located close to the First Officer pedals.
Its 6 outputs provide the integral lighting of the placards and the instruments on the instrument panels and the pedestal.

(3) Glareshield integral lighting
It comprises:

a circuit breaker 5LF. The normal busbar 103XP supplies this circuit breaker with 115VAC/400Hz (panel 122VU),
two linear or rotary potentiometers mounted in light 38LE. One is for the glareshield integral lighting, the other one for the FCU display lighting,
a lighting controller 30LF located close to 16LF. Three outputs provide instrument display and panel integral lighting.

(4) Overhead-panel integral lighting
The integral lighting/overhead integral-lighting potentiometer (7LF) is installed on the overhead control and indicating panel 25VU.
The function of the potentiometer is to adjust, from OFF to BRIGHT, the brightness of the integral lighting panels and the instruments on the overhead panel 20VU.
Normal busbar 103XPC supplies 115VAC/400Hz to the overhead-panel circuit breaker (3LF) which is installed on the rear circuit-breaker panel 122VU.
The lighting controller (6LF) supplies the components through:

Four analog outputs, and
Two Pulse Width Modulator (PWM) outputs.

(5) Integral lighting of instrument panels, consoles and center pedestal
The main panel and pedestal integral lighting potentiometer (17LF) is installed on the flood-light integral-lighting-panel 111VU.
The function of the potentiometer is to adjust, from OFF to BRIGHT, the brightness of the panels and the instruments on the main instrument panel and pedestal.
Normal busbar 103XPC supplies 115VAC/400Hz to the main instrument panel and pedestal integral lighting circuit breaker (4LF) which is installed on the rear circuit-breaker panel 122VU.
A lighting controller (16LF) supplies the components through:

Four analog outputs, and
Two PWM outputs.

(6) Glareshield integral lighting
The center main-instrument-panel light (38LE), which has two potentiometers, is installed on the glareshield 13VU.
The function of the potentiometers is to adjust, from OFF to BRIGHT, the brightness of the glareshield integral lighting and display lighting.
Normal busbar 103XPC supplies 115VAC/400Hz to the glareshield integral lighting circuit-breaker (5LF) which is installed on the rear circuit-breaker panel 122VU.
A lighting controller (30LF) supplies the components through:

Three analog outputs, and
Two PWM outputs (only one PWM output is used).

B. Standby Compass Lighting
The lighting system of the standby compass comprises:

A circuit breaker 1LF. The busbar 401PP supplies this circuit breaker with 28VDC (panel 49VU),
A STBY COMPASS switch 2LF. It has 2 positions and controls the standby compass lighting (panel 25VU),
A foldable standby compass.

[Rev.10 from 2021] 2026.04.01 05:16:01 UTC