B787 Landing Gear Systems

What subsystems are part of the landing gear system?. Proximity sensing system. Air/ground system. Main gear and doors. Nose gear and doors. Proximity sensing system, Air/ground system, Main gear and doors, Nose gear and doors.

What components are part of the main landing gear assembly?. Shock strut. Side brace assembly. Tilt actuator. Axle. Shock strut, Side brace assembly, Drag brace assembly, Gear truck assembly.

What are the primary structural load paths for the drag brace and shock strut?. Drag brace and shock strut. Shock strut only. Drag brace only. Wheel axle assembly.

What allows the cylinder to move up and down in the landing gear system?. Torque links. Steering collar. Nitrogen top of strut. Hydraulic fluid.

Where is the servicing valve located in the nose landing gear shock strut?. Top of the shock strut. Bottom of the shock strut. Near the shutoff valve. At the P40 panel.

How are the NLG forward doors opened and closed?. Connected to linkage and open/close by NLG door actuator. Attached with hinges and move by actuator. Open/close by actuator. Open/close by hinges.

What does the landing gear control system sense and control?. Gear and door positions. Hydraulic pressure for extension and retraction. Brake pressure. Tire pressure. Gear and door positions and hydraulic pressure for extension and retraction.

How are the gear and doors powered and controlled?. Hydraulically powered, controlled by valves. Electrically powered, controlled by sensors. Mechanically powered, controlled by gears. Pneumatically powered, controlled by actuators.

Into how many categories are the proximity sensors divided?. Two. Three. Four. Five.

What do control proximity sensors determine?. Airspeed. Gear, truck, and door positions. Hydraulic pressure. Brake pressure.

How many sensors are there per position for redundancy?. One. Two. Three. Four.

What does the LGA/NWS control function use data to operate?. Brakes. Engine thrust. Gear. Flaps.

What does the bypass/auto off valve module provide?. Hydraulic pressure to retraction and extension components. Electrical power to sensors. Mechanical control to actuators. Pneumatic power to tires.

What can release the landing gear lever lock mechanically?. Hydraulic pressure. Electrical override. Mechanical lock override. Pneumatic pressure.

The landing gear control lever has two positions, ______ and DN. UP. DOWN. LEFT. RIGHT.

An RPDU supplies 28-V dc to a ______ in the landing gear control lever module to lock the lever in the down position on the ground. proximity sensor. relay. lever lock solenoid. control valve.

A ______ pushbutton on the module releases the lock if it is necessary to move the lever to the UP position. LOCK OVRD. RELEASE. UNLOCK. OVERRIDE.

Three switch contacts in each position give a different ______ to RDCs. voltage. ground discrete. digital signal. CAN bus data.

The RDCs change the discrete data to ______ and put the data on the common data network (CDN). voltage signals. digital data. analog signals. hydraulic pressure.

The LGA/NWS control function in the CCS identifies this data as a(n) ______ command. up or down. left or right. open or close. engage or disengage.

If the data from ______ of the three switches are valid, the LGA/NWS control function starts the landing gear operation sequence. one. two. all. none.

The ______ proximity sensors on the NLG sense conditions for sequence control. singular. pair of. individual. triplet of.

Each control proximity sensor in an NLG or MLG pair connects to a different ______ in the main wheel wells. RPDU. CCR. RDC. PSDC.

If a sensor pair has no failures and the sensor data disagree, the LGA/NWS control function will ______ perform the next step in the sequence. always. sometimes. never. automatically.

A pair of control proximity sensors on the NLG senses the condition: __. NLG up, NLG down. NLG left, NLG right. NLG forward, NLG back. NLG stowed, NLG deployed.

Each control proximity sensor in a pair must show the same condition, or the __ will not occur. subsequent step. initial step. previous step. final step.

Each PSDC changes the analog control sensor data to __ data. digital. analog. binary. sequential.

Each sensor in a pair connects to a different __. PSDC. RPDU. LGA/NWS. MCP.

The LGA/NWS control function uses control sensor data to identify __. landing gear and door positions. hydraulic pressure. fuel levels. engine status.

If there is a failure of one sensor in a pair, the sequence will continue on input from the __. good sensor. failed sensor. third sensor. auxiliary sensor.

The relay contacts open the __ connection during alternate extension or ground door operation. 28-V dc. 14-V dc. 115-V ac. 230-V ac.

Each relay has contacts that connect between an RPDU and an __ solenoid. enable. disable. auxiliary. secondary.

There are __ NLG bypass/off relays. two. three. four. one.

These relay contacts open the 28-V dc connection to prevent __. unwanted landing gear movement. hydraulic pressure loss. electrical failure. fuel leakage.

The relay contacts open during __ operation. alternate extension. normal retraction. engine start. taxiing.

Each bypass/auto-off valve module has __ enable solenoids. two. three. four. one.

The relay contacts are in the __ position during an alternate extension. inhibited. engaged. neutral. active.

Normal valve module operation is prevented during __. ground door operation. landing gear retraction. hydraulic pressure testing. flight.

The NLG door control opens the forward doors when the NLG doors are near the __ position. full-open. closed. locked. neutral.

The NLG control valve module moves to the __ position when the NLG strut is near the full-down position. extend. retract. neutral. lock.

The NLG door control valve module closes the forward doors when the NLG strut is near the __ position. full-down. full-up. neutral. locked.

The NLG door safety valve module prevents the NLG doors from closing with __ pressure. hydraulic. electrical. pneumatic. mechanical.

The alternate release actuators ensure that the __ release before pressurized fluid goes to the NLG and MLG strut alternate release actuators. gear. wheels. brakes. doors.

__ bus power goes to alternate extension system components. Main. Essential. Backup. Hot battery.

The RDCs receive data from the __ during alternate extension. MLG door open relays. NLG bypass/off relays. PSDCs. Alternate extend power pack.

The alternate extend relays A and B are powered by __ V-dc hot battery bus power. 24. 28. 32. 36.

The DOORS switch on the P56 panel is used to __ all landing gear doors on the ground. close. monitor. open. test.

The __ switch on the P56 panel has positions OFF, ALL DOORS OPEN, and MLG DOOR CLOSE. control. arm. safety. main.

To reset the relays after door operation, the doors must be closed and the gear handle __. lowered. raised. locked. neutral.

The control switch on the P56 panel is used to manage __. door operation. hydraulic pressure. electrical systems. avionics.

Landing gear control proximity sensors are used for gear and door __. sequencing. locking. monitoring. testing.

Control proximity sensors operate independently from __ sensors. pressure. indication. temperature. flow.

PSDCs send data to RDCs through __ buses. CAN. electrical. hydraulic. pneumatic.

The control and indication partitions for system 1 are in the __ CCR cabinet. left. right. forward. aft.

The NLG indication and warning system uses __ PROX sensors. 1. 2. 3. 4.

The MLG indication and warning system uses __ PROX sensors. 1. 2. 3. 4.

The ARDC provides wireless power to the TPS by __ coupling. capacitive. inductive. resistive. direct.

The 787-8 nose wheel tires are __ with 787-9 tires. interchangeable. not interchangeable. compatible. identical.

The brake actuation system includes __ EBACs. 2. 4. 6. 8.

The NWS system includes a __ module for electronic control. Data. Remote Electronics Unit (REU). Central Processing. Remote Data Concentrator (RDC).

The NWS system uses __ position transducer modules. 1. 2. 3. 4.

The NWS system operates with center __ pressure. pneumatic. electric. hydraulic. mechanical.

The NWS system interfaces with __ through Remote Data Concentrators (RDC). Flight Control Electronics (FCE). Common Core System (CCS). both FCE and CCS. Landing Gear Actuation System.

The captain and first officer rudder pedals provide __ control to turn the nose wheel. low-speed. high-speed. emergency. manual.

Rudder pedal disconnect switches on the tillers disconnect __ inputs to the NWS system. rudder pedal. tiller. actuator. hydraulic.