DOC AIRBUS | AMM A320FLANDING LIGHTS - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
Two retractable landing lights are installed on the bottom of the wings at Zone 571 and 671. The lights operate through maximum operating speeds (VMo).
** ON A/C NOT FOR ALL Two retractable landing lights are installed on the bottom of the wings at Zone 571 and 671. The lights operate through maximum operating speeds (VMo).
2. Component Location
Landing Lights - Component Location ** ON A/C NOT FOR ALL
Landing Lights - Component Location ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Landing Lights - Component Location ** ON A/C NOT FOR ALL Landing Lights - Component Location ** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 7LB | LT-LANDING, L | 571 | 33-42-11 | ||
| ** ON A/C NOT FOR ALL | |||||
| 8LB | LT-LANDING, R | 671AB | 671 | 33-42-11 | |
| ** ON A/C NOT FOR ALL | |||||
| 8LB | LT-LANDING, R | 671 | 33-42-11 | ||
3. System Description
Landing Lights - Component Location ** ON A/C NOT FOR ALL
Landing Lights - Component Location ** ON A/C NOT FOR ALL
The left-hand (LH) landing light 7LB and the right-hand (RH) landing light 8LB are installed on the bottom of the LH and RH wings. Each landing light has an independent extension/retraction and illumination circuit. Two toggle switches, LAND L 5LB and LAND R 6LB, control the landing light system. These switches are installed on the overhead panel 25VU in the cockpit. When the landing lights are extended, an indication 'LAND LT' is shown on the cathode ray tube (CRT) as a memo message. The CRT is a part of the Electronic Centralized Aircraft Monitoring system (ECAM) (Ref. AMM D/O 31-52-00-00).
** ON A/C NOT FOR ALL Landing Lights - Component Location ** ON A/C NOT FOR ALL Landing Lights - Component Location ** ON A/C NOT FOR ALL 4. Power Supply
The 115V AC busbars, 101XP and 202XP, supply power to the LH and RH landing lights through the circuit breakers 1LB, 2LB, 3LB and 4LB. These circuit breakers are installed on panel 122VU in the cockpit. The circuit breakers 1LB and 2LB control the power supply to the LH and RH landing light step-down transformers. The circuit breakers 3LB and 4LB control the power supply to the LH and RH single-phase motors of the landing lights.
** ON A/C NOT FOR ALL The 115V AC busbars, 101XP and 202XP, supply power to the LH and RH landing lights through the circuit breakers 1LB, 2LB, 3LB and 4LB. These circuit breakers are installed on panel 122VU in the cockpit. The circuit breakers 1LB and 2LB control the power supply to the LH and RH landing light step-down transformers. The circuit breakers 3LB and 4LB control the power supply to the LH and RH single-phase motors of the landing lights.
5. Interface
Not Applicable
** ON A/C NOT FOR ALL Not Applicable
6. Component Description
A. Landing Light Assembly FIN: 7-LB FIN: 8-LB
For Halogen technology:
For Halogen technology:
- One single-phase motor which has an electromagnetic brake. This is connected to a gearbox which moves a screw-jack that extends and retracts the lamp housing,
- One lamp housing which has installed a 28VAC, 600 WATT, General Electric (GE) sealed-beam unit or Substitute Halogen Lamp (SHL) unit,
- One step-down transformer, attached to the gearbox housing,
- Two sealed limit microswitches,
- One power relay and
- One full-wave rectifier.
For LED technology: - One single-phase motor which has an electromagnetic brake. This is connected to a gearbox which moves a screw-jack that extends and retracts the lamp housing,
- One lamp housing which has installed a 115VAC, 220 WATT, assembly optical-LED unit,
- One step-down transformer, attached to the gearbox housing,
- Two sealed limit microswitches,
- One power relay and
- One full-wave rectifier.
B. Two toggle switches 5LB and 6LB
The toggle switches LAND L 5LB and LAND R 6LB have three switch positions, which are labelled ON, OFF and RETRACT.
The toggle switches LAND L 5LB and LAND R 6LB have three switch positions, which are labelled ON, OFF and RETRACT.
7. Operation/Control and Indicating
Landing Lights - Component Location ** ON A/C NOT FOR ALL
Landing Lights - Component Location ** ON A/C NOT FOR ALL
Landing Lights - Component Location ** ON A/C NOT FOR ALL Landing Lights - Component Location ** ON A/C NOT FOR ALL A. Two control switches 5LB and 6LB are installed on the overhead panel 25VU. The switch LAND L controls the left-hand landing light and the switch LAND R controls the right-hand landing light. These switches are operated from RETRACT to OFF to ON for extension and illumination of the landing lights. Then from ON to OFF to RETRACT, to set the landing lights to off and to retract them. These operations are as follows:
- RETRACT to OFF
Power is supplied to the extend coil of the related motor, through a microswitch, to extend the related landing light. - OFF to ON
Power is supplied to the related power relay, through the full-wave rectifier and the closed contacts of a microswitch. This connects 115V AC, 400Hz, to the step-down transformer which decreases the voltage to 28V AC. The related landing light comes on. - ON to OFF
This removes power from the related power relay and opens the contacts of the microswitch. This removes 115V AC, 400 Hz, from the step-down transformer and the related landing light goes off. - OFF to RETRACT
Power is supplied to the retract coil of the related motor, which retracts the related landing light. The landing light stays off.