A330 L&B - ATA 32

What happens if one Landing Gear Control and Interface Unit (LGCIU) fails?. The landing gear system shuts down completely. Hydraulic pressure to the landing gear system is lost. The remaining LGCIU automatically takes over system control. . The landing gear remains mechanically locked in position.

Under which condition does the DECEL light illuminate during normal braking with autobrake?. When the BSCU detects that the aircraft deceleration reaches at least eighty percent (80%) of the selected autobrake deceleration. . When the BSCU detects that the aircraft deceleration reaches at least sixty percent (60%) of the selected autobrake deceleration. When the brake pedals are applied and green hydraulic pressure is available in the braking system.

What type of design is used in the Nose Landing Gear (NLG) shock absorber?. Two-chamber oleo-pneumatic shock absorbe. two-chamber hydraulic shock absorber. Two-Mechanical spring shock absorber.

What type of control architecture is used by the alternate braking system?. A hydro-mechanical system where brake pedal input mechanically meters blue hydraulic pressure to the brakes. . A fully electrical braking system where brake pressure is commanded electronically by the BSCU. A pneumatic braking system where compressed air pressure is applied directly to the brake units.

Which condition must occur for the alternate braking mode to be activated automatically?. Loss of green hydraulic pressure or loss of the normal braking control by the BSCU. Loss of blue hydraulic pressure or loss of the normal braking control by the BSCU. Loss of yellow hydraulic pressure or loss of the normal braking control by the.

During the extension sequence of the Main Landing Gear (MLG), what is the effect of the pressurized pitch trimmer on the bogie beam?. It moves the articulating links and allows the hydraulically pressurized pitch trimmer to retract, setting the bogie beam to the trim angle. It retracts the shock absorber and moves the bogie beam to the trailed position so the landing gear can enter the landing gear bay. It releases the side stay downlock and hydraulically drives the landing gear leg assembly to the extended position.

What is the function of the Rotary Variable Differential Transducers (RVDTs) in the Nose Landing Gear steering system. They measure the steering angle of the nose wheels and send position feedback to the BSCU. They supply hydraulic pressure to the steering actuators during taxi operations. They lock the nose landing gear in the centered position during flight.

How many normal servo valves are installed in the normal braking system and what is their function?. Two normal servo valves that distribute hydraulic pressure equally to all brake units. Four normal servo valves that modulate green hydraulic pressure to the brake units under BSCU control. Eight normal servo valves that supply hydraulic pressure directly to each brake unit.

What is the main function of the baulk solenoid in the landing gear control system?. It prevents landing gear retraction when the aircraft is not in flight conditions. It allows the landing gear lever to be selected UP during ground maintenance operations. It commands the selector valve manifold during the landing gear extension sequence.

Where is the anti-skid function installed and what inputs are required for it to operate?. In the BSCU, which uses wheel speed signals and brake pedal commands to control brake pressure. In the LGCIU, which uses proximity sensor signals and landing gear position information. In the ADIRU, which uses aircraft speed and attitude data to control braking.

In which braking modes does the antiskid system operate?. During normal braking only. During alternate braking only. During both normal braking and alternate braking.

Which conditions must be present for the normal braking system to operate?. The green hydraulic system must be pressurized and the BSCU must be energized. The yellow hydraulic system must be pressurized and the LGCIU must be energized. The blue hydraulic system must be pressurized and the autobrake system must be armed.

Can the Main and Nose Landing Gear doors be closed without green hydraulic pressure?. No. The spring-loaded bulk device of the by-pass valve prevents movement toward the door-closed position when the green hydraulic system is not pressurized. . Yes. The spring-loaded bulk device of the by-pass valve assists the movement toward the door-closed position when the green hydraulic system is not pressurized. Yes. The spring-loaded bulk device of the by-pass valve prevents movement toward the door-closed position when the green hydraulic system is pressurized.

What happens if only one switch of the landing gear free-fall lever is selected?. Only one electrical circuit is energized, and the free-fall actuators operate at half speed. The free-fall system is inhibited, and no uplocks are released until both switches are selected. Only the landing gear doors are released, but the landing gear uplocks remain locked.

During the retraction sequence of the Main Landing Gear (MLG), what is the function of the shortening mechanism?. It reduces the length of the landing gear and moves the bogie beam to the trailed position so the gear can enter the landing gear bay. It increases the length of the landing gear and moves the bogie beam to the trim angle position so the gear can enter the landing gear bay. Decrease the length of the NLG.

Which device must be used to electrically deactivate the Nose Wheel Steering system before towing operations?. The disconnect pin installed on the nose landing gear steering mechanism. The steering deactivation lever located in the steering deactivation box. . The hydraulic fuse installed in the steering hydraulic supply line.

What is the purpose of the spare seals installed in the landing gear shock absorber?. To provide additional sealing capability in case the primary seal fails or wears out. . To control the nitrogen pressure inside the shock absorber during landing. To regulate the hydraulic flow used to extend the landing gear.

Who controls a complete landing gear extension and retraction cycle?. One LGCIU controls one complete cycle consisting of one UP selection and one DOWN selection. Two LGCIUs operate simultaneously to control one complete extension and retraction cycle. One LGCIU controls only the extension sequence while the other controls the retraction sequence.

Which sensors provide the landing gear position signals to the LGCIU channels?. Proximity sensors that send gear position signals to the LGCIU channels for system monitoring and indication. . Hydraulic pressure switches that send gear position signals to the LGCIU channels for braking and gear control. Optical sensors that transmit landing gear position signals directly to the landing gear selector valve.

How does the landing gear system prevent landing gear extension when the aircraft speed is above two hundred eighty (280) knots?. By a safety valve that prevents hydraulic pressure from reaching the landing gear extension system when airspeed exceeds two hundred eighty knots. By a normal selector valve that prevents hydraulic pressure from reaching the landing gear extension system when airspeed exceeds two hundred eighty knots. By a cut-out valve that prevents hydraulic pressure from reaching the landing gear extension system when airspeed exceeds two hundred eighty knots.

How does the seal changeover valve maintain shock absorber operation after a primary seal failure?. It isolates the damaged seal chamber and redirects hydraulic pressure to the secondary sealing area of the shock absorber. . It releases nitrogen pressure from the upper chamber to reduce the internal load on the shock absorber seals. It mechanically locks the piston movement to prevent further leakage from the damaged sealing area.

When the brake pedals are deflected with the green hydraulic system available, which braking mode is activated?. Automatic braking mode. Manual braking mode. In-flight braking mode.

What precautions must be taken before activating the seal changeover valve in the landing gear shock absorber. The shock absorber must be slightly deflated and the landing gear doors must be closed. The landing gear must be retracted and the landing gear doors must be closed. The BSCU must be switched off and the parking brake must be released.

How does the MLG shortening mechanism reduce the landing gear length during retraction?. Through a mechanical linkage composed of adjustable link, bellcrank, and upper/lower links that compress the shock absorber during gear retraction. Through a hydraulic linkage that increases pressure inside the shock absorber to shorten the oleo strut during the landing gear retraction sequence. Through an electrically driven actuator that shortens the main landing gear before it enters the landing gear bay.

Which sequence correctly describes the landing gear extension process?. Gear selector DOWN → door uplocks release → doors open → gear uplocks release → landing gear extends → downlock engages. . Gear selector DOWN → doors open → door uplocks release → landing gear extends → gear uplocks release → downlock engages. Gear selector DOWN → door uplocks release → landing gear extends → doors open → gear uplocks release → downlock engages.