CBT - Landing Gear Flashcards
(24 cards)
When using landing gear gravity extention when there is not hydraulic power, what will happend to the landing gear doors after extention?
The landing gear doors will stay open
Will NWS be available after L/G Gravity extention?
Yes in both normal and alternate modes
What landing gear operation limitation exists if **Y HYD **fails?
Gear Retraction:
Only Nose gear full retraction is available.
Both BLG and WLG gear will stay extended and only the WLG doors will open.
WLG is prevented to retract even though it is powere by the G HYD as it may collide with the BLG
What landing gear operation limitation exists if **G HYD **fails?
Only the BLG will fully retract since G HYD controls NLG and WLG
Which HYD sys controls which gear
BLG doors and gear controlled by Y and WLG by G
Which systems are related to the landing gear?
- The Landing Gear Extension and Retraction System (LGERS)
- The Brake Control System (BCS)
- The Steering Control System (SCS)
- The Tire Pressure Indicating System (TPIS)
- The Brake Temperature Monitoring System (BTMS), and
- The Oleo Pressure Monitoring System (OPMS).
What is the main role of the Landing Gear Extension and Retraction System (LGERS)
- The opening/closure of the landing gear doors, and
- The extension and the retraction of the landing gears.
How does the LGERS monitor/control and actuate the Landing gear?
Norma and Abnormal
Where does the LGERS fall In the HYD architecture?
The LGERS is only pressurized during the extension and retraction phases, isolated from hydraulic pressure otherwise.
What are the components of the LGERS?
The LGERS has two independent and redundant Landing Gear Control and Indication System (LGCIS) referred to as LGCIS 1 and LGCIS 2
they alternate after each gear retraction cycle
From where does the L/G indicator panel (main instrument panel) get indications about gear uplock/downlock?
Only LGCIS 1 sends landing gear position data to the **L/G indicator panel ** using an additional and independent set of downlock proximity sensors.
These sensors are also electrically independent.
Which system controls the L/G Gravity extention?
What caution exists with gravity extention?
Two Free Fall Control Modules (FFCM A and FFCM B) control the gravity extension of the landing gears.
The FFCMs are independent from the LGCIS
Non reversible incase normal extention fails and RESET shall not be done in flight
What are the average timings for gear operation?
Normal and Gravity Ext
Normal 60s
Gravity Ext 70s
At what speed is the gear extention inhibited?
The LGCIS receives airspeed data from the ADIRS to inhibit the extension of the landing gear above 280 kt.
How is steering achieved on the A380?
- Nose Wheel Steering (NWS), and
- Body Wheel Steering (BWS).
What is the role of the Body Wheel Steering?
On ground, the BWS reduces the loads on the BLG
How many NWS modes are there?
- The normal NWS, and
- The alternate NWS when the normal NWS fails
What HYD system powers normal NWS steering? What happens if it fails?
G HYD provides normal steering.
If the GREEN hydraulic supply fails, the alternate NWS activates automatically. The hydraulic power is supplied by:
- The LEHGS, and/or
- The NWS accumulator
Is steering performance the same in alternate steering?
No, it is degraded. The damping of the steering handwheels automatically increases to prevent the flight crew from commanding excessive steering rates
What supplies BWS in mode? And what happens if that system fails?
Yellow Hydraulic.
In case of a Y hydraulic failure, both BLGs are locked in the centered position by the locking mechanisms.
Which FBW system controls and send alerts for the entire NWS and BWS system?
Wheel Steering Control System (WSCS)
With two redundant channels 1 & 2
How does the BWS operate during pushback to reduce BLG stress when Y HYD is off?
Two Electrical Motor Pumps (EMPs), located on the Y hydraulic system, supply the BWS actuators during pushback
When does the BWS automatically operate during taxi?
What is the maximum deflection for BWS
GS < 30 and NWS reaches 20
15 degrees
What is the maximum pilot NWS tiller steering angle and autopilot/rudder angle?
Pilot 70 degrees
Autopilot/Rudder 6 Degrees
