CH14 LANDING GEAR Flashcards
What happens when the landing gear lever is in the UP position?
The landing gear retracts.
What happens when the landing gear lever is in the DN position?
The landing gear extends.
What does the AUTOBRAKE Selector set to OFF do?
Deactivates and resets the autobrake system.
What is the function of the DISARM setting on the AUTOBRAKE Selector?
Disengages the autobrake system and releases brake pressure.
List the deceleration rates that can be selected on the AUTOBRAKE Selector.
- 1
- 2
- 3
- 4
- MAX AUTO
What does the RTO setting on the AUTOBRAKE Selector do?
Automatically applies maximum brake pressure when the thrust levers are retarded to idle above 85 knots.
What is the purpose of the Landing Gear Lever Lock Override (LOCK OVRD) Switch?
Releases the landing gear lever lock.
What does the NORM position of the Alternate Gear (ALTN GEAR) Switch indicate?
The landing gear lever operates normally.
What happens when the Alternate Gear Switch is set to DOWN?
The landing gear extends by the alternate extension system.
True or False: Alternate extension may be selected with the landing gear lever in any position.
True
What is the function of the Nose Wheel Steering Tiller?
Turns the nose wheels up to 70° in either direction
It is summed with rudder pedal steering inputs.
What does the Tiller Position Indicator show?
Tiller displacement from the straight-ahead, neutral position
There are three marks: center mark for neutral position and two for maximum left and right displacements.
What is the purpose of the Rudder Pedal Disconnect Switch?
Temporarily disables the rudder pedal inputs
It is used during a flight controls freedom of motion check and must be held down to function.
True or False: The Tiller Position Indicator has only one mark.
False
It has three marks indicating the neutral position and maximum displacements.
Fill in the blank: The Nose Wheel Steering Tiller can rotate to a maximum of _______ degrees.
70°
What must be done for the Rudder Pedal Disconnect Switch to function?
It must be held down
The switch is spring loaded to the out position.
What does the Rudder Pedal Adjust Crank do?
Adjusts the rudder pedals forward or aft.
To avoid inadvertent rudder pedal movement, the crank handle should be stowed when not in use.
What is the function of pushing the full rudder pedal?
Turns the nose wheel up to 8° in either direction.
What happens when the top of the rudder/brake pedals is pushed?
Actuates the wheel brakes.
Where can you find additional information on Rudder Trim Control?
Chapter 9, Section 10.
Where is information on Normal Mode Yaw Control located?
Chapter 9, Section 20.
What chapter covers Secondary and Direct Mode Yaw Control?
Chapter 9, Section 20.
What is the purpose of the Parking Brake Lever?
To engage or disengage the parking brake.
Fill in the blank: The rudder pedal movement should be ______ when not in use.
stowed.
True or False: The rudder pedals can move the nose wheel up to 10° in either direction.
False.
What does pulling the Parking Brake Lever do?
Sets the parking brake when both brake pedals are simultaneously depressed
The Parking Brake Lever is a crucial control in the B787 brake system.
How do you release the parking brake in the B787?
Simultaneously depress both brake pedals
This action is necessary to safely release the parking brake.
What does a green DOWN indication on the EICAS display signify?
All landing gear are down and locked
This is the normal indication for landing gear status.
What does a crosshatched white indication on the EICAS display represent?
One or more landing gear are in transit
This indicates that the landing gear is moving to the desired position.
What does a white UP indication on the EICAS display mean?
All landing gear are up and locked (blanks after 10 seconds)
The indication disappears after a set time if conditions remain unchanged.
What does an empty box (white) on the EICAS display indicate?
All landing gear position indicators are inoperative
This indicates a failure in the landing gear indication system.
What does the term ‘Expanded Gear Position Indication’ refer to?
Non-normal display of landing gear position
This indicates that there is a malfunction or unusual condition in the landing gear system.
What does DN (green) indicate in the landing gear position indications?
The associated landing gear is down and locked.
What does a crosshatched (white) landing gear indication mean?
The associated landing gear is in transit.
What does UP (white) indicate in landing gear position indications?
The associated landing gear is up and locked.
What does an empty box (white) in landing gear position indicators signify?
The associated landing gear position indicators are inoperative.
How can the landing gear synoptic be displayed?
By pushing the systems (SYS) display switch, then selecting the landing gear (GEAR) synoptic key.
Which chapter and section contain additional information about the Display Select Panel?
Chapter 10, Section 10.
What does a Brake Normal indication (white) signify?
Brake temperature value in normal range from 0.0 to 4.9
Indicates that the brakes are functioning within expected temperature limits.
What does a Hottest Brake indication (solid white) represent?
Brake temperature value from 3.0 to 4.9. Only one hottest brake symbol per truck is displayed at any time
Helps identify which brake is operating at the highest temperature within the allowed range.
What does a Brake Overheat indication (solid amber) indicate?
Brake temperature value from 5.0 to 9.9. Multiple brake overheat symbols may appear simultaneously
Alerts the crew that the brake temperatures are higher than normal and may require action.
What advisory message is displayed when the brake temperature is in the overheat range?
EICAS advisory message BRAKE TEMP
This message is crucial for monitoring brake health and safety.
What does a Brake Signal Invalid indication (white, low intensity) mean?
Brake temperature value reads invalid
Indicates a potential fault or error in the brake temperature sensing system.
What is the temperature range for a Brake Normal indication?
0.0 to 4.9
This range indicates that the brakes are functioning properly.
What is the temperature range that triggers a Brake Overheat indication?
5.0 to 9.9
This range requires immediate attention from the flight crew.
Fill in the blank: The Hottest Brake indication is displayed in _______.
solid white
This visual cue helps pilots identify the brake with the highest temperature.
True or False: Multiple Brake Overheat symbols can appear simultaneously.
True
This allows for immediate awareness of multiple overheating brakes.
What does the amber indication for Brake Inoperative indicate?
Indicates loss of brake function or brake deactivation on the associated wheel.
This is part of the B787 FCOM and FCTM systems description.
What does the amber indication for Antiskid Inoperative signify?
Indicates antiskid fault on the associated wheel.
This is relevant for understanding landing gear systems in the B787.
What does the white symbol for Tyre Pressure Normal indicate?
Tyre Pressure Normal
This indicates that the tyre pressure is within the normal range.
What does the amber indication for Tyre Pressure Abnormal signify?
Indicates respective tyre pressure in abnormal high or low range.
EICAS advisory message TIRE PRESS is displayed when this condition occurs.
Fill in the blank: The symbol for Tyre Pressure Normal is _______.
white
What is the purpose of the Gear Door Indications?
To display the condition of the gear doors.
Gear door indications are crucial for landing gear system checks.
What is the significance of the EICAS advisory message TIRE PRESS?
It is displayed when tyre pressure is abnormal.
This message alerts the crew to potential issues with tyre pressure.
What are the two conditions indicated by Tyre Pressure symbols?
- Normal (white)
- Abnormal (amber)
Each condition provides critical information regarding the operational status of the aircraft’s tyres.
Which manual contains information about the Landing Gear System Indications?
B787 FCOM
The Flight Crew Operating Manual (FCOM) provides essential information for pilots.
True or False: The amber indication for Brake Inoperative means that the brakes are functioning normally.
False
Amber indications generally signify a warning or malfunction.
What does the symbol ‘CLOSED’ indicate regarding the landing gear doors?
Indicates respective gear door is closed.
Nose gear doors indicate closed when the gear is down.
What does the indication ‘Door In Transit’ signify?
Indicates respective gear door is in transit.
What does a ‘Door signal invalid’ indication represent?
Indicates respective gear door sensor reads invalid.
How many main landing gears does the airplane have?
Two main landing gears and a single nose gear.
What type of unit is the nose gear?
A conventional two wheel steerable unit.
How many wheels does each main gear have?
Four wheels in tandem pairs.
What provides hydraulic power for landing gear functions?
The center hydraulic system.
What is provided as an alternate for landing gear extension?
An alternate extension system.
How many Electric Brake Actuator Controllers (EBACs) are in the Electro-Mechanical Brake System?
Four EBACs.
How many Electric Brake Actuators (EBAs) are there per wheel brake?
Four EBAs per wheel brake.
What features are provided by the Electro-Mechanical Brake System?
- Autobrake protection
- Antiskid protection
What does the brake temperature monitor system do?
Displays the temperature for each brake on the GEAR synoptic.
What information does the tyre pressure monitor system provide?
Displays pressure for each tyre on the GEAR synoptic.
What is the role of the air/ground sensing system?
Controls in-flight and ground operation of various airplane systems.
What does the Air/Ground Sensing System do?
It configures the airplane systems to the appropriate air or ground status based on signals from sensors located on each main landing gear beam.
The system is essential for managing various airplane systems during ground operations.
How is the landing gear normally controlled?
By the landing gear lever, which is held in the DN position by an automatic lever lock on the ground.
The lever lock can be manually overridden.
What happens to the landing gear lever in flight?
The lever lock is automatically released through air/ground sensing.
This allows the pilot to control the landing gear without manual intervention.
What is the function of the early doors function during landing gear retraction?
It automatically pre-opens the main landing gear doors one second after lift-off.
This occurs before the pilot moves the gear lever to the UP position.
What occurs if the pilot does not move the gear lever to UP within 30 seconds after lift-off?
The main gear doors return to the closed position.
This ensures the doors are only open when necessary.
What is indicated by the EICAS landing gear position display when the gear is retracting?
It changes from a green DOWN indication to a white crosshatch in-transit indication.
This shows that the landing gear is in the process of retracting.
What happens to the landing gear hydraulics after retraction?
The landing gear hydraulic system is automatically depressurized.
This is done to prevent any unintended deployment of the gear.
What EICAS message is displayed if any gear is not up and locked after the normal transit time?
GEAR DISAGREE.
This alerts the crew to a potential issue with gear retraction.
What does the EICAS advisory message GEAR DOOR indicate?
It is displayed if any hydraulically actuated door is not closed after normal transit time.
This is critical for ensuring proper aerodynamics and safety.
What occurs when the landing gear lever is moved to DN?
Landing gear doors open, the gear are unlocked, and the in-transit indication is displayed.
This initiates the gear extension process.
How does the landing gear free-fall to the down and locked position?
Without hydraulic power, the gear free-falls into position.
This ensures that the landing gear can still deploy in the event of hydraulic failure.
What does the EICAS caution message GEAR DISAGREE indicate upon landing gear extension?
It is displayed if any gear is not locked down after the normal transit time.
This is crucial for confirming that all gear are secure before landing.
What happens if only one brace on a main gear is locked after the normal transit time?
The EICAS caution message GEAR DRAG BRACE L, R or GEAR SIDE BRACE L, R is displayed for the affected gear.
This alerts the crew to a specific issue with the gear locking mechanism.
What system is used for the alternate landing gear extension?
A dedicated DC powered electric hydraulic pump and center hydraulic system fluid
This system allows the landing gear to be extended in case of hydraulic system failure.
What happens when the ALTERNATE GEAR switch is selected to DOWN?
Releases all door and gear uplocks, allowing the landing gear to free-fall to the down and locked position
The landing gear lever position has no effect on this operation.
What does the EICAS message GEAR DOOR indicate during alternate extension?
All hydraulically powered gear doors remain open
This message is displayed when the alternate extension system is activated.
How can the landing gear be retracted after an alternate extension?
By the center hydraulic system if it is operating, using the gear lever
Select DN then UP with the gear lever to retract the landing gear.
What powers the nosewheel steering system?
The center hydraulic system
This system provides primary steering control through a tiller for each pilot.
What is the maximum angle the nosewheels can be turned using the tillers?
Up to 70° in either direction
Limited steering control is also available through the rudder pedals.
What components make up the brake system on the B787?
Antiskid protection, autobrake system, electric brake system, parking brake
Each main gear wheel has a multiple disc carbon brake.
How is the electric brake system powered?
By four electric brake power supply units
The brake pedals provide independent control of the left and right brakes.
What controls the application of braking force to the carbon disc?
Electric Brake Actuators (EBAs)
There are four EBAs on each main landing gear wheel brake.
What provides antiskid protection on the brake system?
An individual main gear wheel basis
When a wheel speed sensor detects a skid, braking force is reduced until skidding stops.
What is used for locked wheel protection in the brake system?
Comparison with other wheel speeds
Touchdown and hydroplaning protection is provided using airplane inertial groundspeed.
What advisory message is displayed if an antiskid fault affecting the brake system is detected?
ANTISKID
This indicates a fault in the antiskid protection system.
What does the autobrake system provide during landing?
Automatic braking at preselected deceleration rates
This includes full pressure for rejected takeoff.
List the EICAS memo messages that display the selected autobrake settings.
- AUTOBRAKE 1
- AUTOBRAKE 2
- AUTOBRAKE 3
- AUTOBRAKE 4
- AUTOBRAKE MAX
- AUTOBRAKE RTO
These settings help pilots manage braking during various phases of flight.
When is the EICAS advisory message AUTOBRAKE displayed?
If the autobrake system is disarmed or inoperative
Also displayed if the AUTOBRAKE selector is OFF but the system is armed, or an RTO is initiated above 85 knots without autobraking.
What conditions must be met for maximum braking in RTO mode to occur?
- Airplane is on the ground
- Groundspeed is above 85 knots
- Both thrust levers are retarded to idle
If these conditions are met, maximum braking pressure is commanded.
What happens if an RTO is initiated at or below 85 knots?
The RTO autobrake function does not operate
This limitation ensures that the autobrake is only active during higher speeds.
How many levels of deceleration can be selected for landing?
Five levels
The maximum autobrake deceleration rate on dry runways is less than full pedal braking.
When does autobrake application begin after landing?
When both thrust levers are retarded to idle and the wheels have spun up
This ensures effective braking post-touchdown.
What is the maximum deceleration level when MAX AUTO is selected?
Limited to AUTOBRAKE 4 level until pitch angle is less than one degree
Then deceleration increases to the MAX AUTO level.
Can the deceleration level be changed without disarming the autobrake system?
Yes
The deceleration level can be adjusted by rotating the selector.
Fill in the blank: The EICAS advisory message _______ is displayed if an antiskid fault is detected.
ANTISKID
True or False: The autobrake system applies maximum pressure when RTO is initiated above 85 knots.
True
This is contingent on the aircraft being on the ground and thrust levers at idle.
What is the purpose of the autobrake system?
To maintain the selected airplane deceleration rate
The system reduces autobrake pressure as thrust reversers and spoilers contribute to total deceleration.
What happens when the autobrake system disarms?
The EICAS advisory message AUTOBRAKE is displayed
This occurs due to various conditions such as pedal braking applied or thrust lever advanced after landing.
List the conditions that can disarm the autobrake system.
- Pedal braking applied
- Thrust lever advanced after landing
- Speedbrake lever moved to DOWN detent
- DISARM or OFF selected on AUTOBRAKE selector
- Autobrake fault
- Normal antiskid system fault
- Loss of inertial data from IRUs
These conditions lead to the disarming of the autobrake system.
What occurs to the AUTOBRAKE selector when the system disarms after landing?
It automatically moves to the DISARM position
This action removes power from the autobrake system.
What is the procedure for taxi brake release?
The brake control system applies one-half of the brakes on each main landing gear
This happens if wheel speeds are less than 30 knots and alternates between wheel pairs.
How is the parking brake set?
By fully depressing both brake pedals, pulling the parking brake lever up, then releasing the pedals
The electric actuators are clamped in position during parking brake application.
What feature does the parking brake system have?
A ‘park and adjust’ feature
This feature monitors brake condition after application and adjusts clamping force as needed.
What happens when the parking brake is set?
The EICAS memo message PARKING BRAKE SET is displayed
If either engine is set to takeoff thrust, an aural alert sounds and CONFIG PARKING BRAKE warning is displayed.
Fill in the blank: The autobrake system provides braking to a complete stop or until it is _______.
disarmed
True or False: The parking brake requires active power to maintain the clamping force when applied.
False
The parking brake electric actuators require no active power to maintain the clamping force.
What is displayed on the GEAR synoptic display regarding wheel brake temperatures?
Numerical values related to wheel brake temperature adjacent to each wheel/brake symbol
Values range from 0.0 to 9.9 in increments of 0.1.
What are the normal range values for wheel brake temperature indicated in the GEAR synoptic display?
0 to 4.9 are white
For values of 3.0 to 4.9, the hottest brake symbol becomes solid white.
What EICAS advisory message is displayed when any brake registers 5.0 or higher?
BRAKE TEMP
This message displays until all brake temperatures are below 3.0.
What happens to the brake temperature value when invalid data or faults are detected?
The value blanks out
Indicates issues in the brake temperature system.
How are tyre pressures displayed on the GEAR synoptic?
Inside each individual gear symbol
Normal values are depicted in white, abnormal values in amber.
What EICAS advisory message is shown if any tyre pressure is above or below normal range?
TIRE PRESS
Also displays for excessive pressure differences between two tyres on the same axle.
What EICAS messages can be displayed related to brakes?
ANTISKID, AUTOBRAKE, AUTOBRAKE 1, AUTOBRAKE 2, AUTOBRAKE 3
Each message indicates specific conditions or levels of the autobrake system.
What does the ANTISKID message indicate?
An antiskid system fault occurs
It alerts the crew to potential braking issues.
What does the AUTOBRAKE message indicate?
The autobrake system is disarmed or failed
This includes levels 1, 2, and 3.
What level of autobrake is indicated when AUTOBRAKE 1 is displayed?
Autobrake level 1 is selected
Similar messages apply for AUTOBRAKE 2 and AUTOBRAKE 3.
Fill in the blank: The brake temperature values tend to ______ after the brakes are used.
increase
True or False: Values above 4.9 for brake temperature are considered normal.
False
Values above 4.9 trigger the BRAKE TEMP advisory.
