LANDING GEAR Flashcards
What’s holding gear down and locked?
1) gravity
2) down lock springs
What valve controls landing gear?
Landing gear electrovalve
What valve holds nose gear doors?
Nose gear doors solenoid valve
What’s holding gear up?
J-Hooks
Whats LGEU?
Landing gear electronic unit
What are the ways of extending learning gear?
1) Gear handle
2) Electric override button
3) Free fall lever
Nose wheel landing light is operated when?
Gear down and locked
What controls and operates landing gear system?
- electrically controlled
* hydraulically operated
ICAS msg: LG AIR/GND FAIL means what?
LGEU cannot determine if aircraft is airborne or on ground. No brakes below 10 kts
When will you get Landing Gear Warning?
Below 1200 ft RA and flaps 0-22° / low TLA)……. Flaps 45………….
RA failed / Low TLA
1 Signal invalid
3 Signals valid
How many must agree?
2
2 Signals valid
2 Signals invalid
How many must agree?
2
What’s holding nose doors up / down?
Hydraulic pressure
How many proximity switches are there?
5 ( 2 on each main and 1 on nose )
If 4 valid signals, how many must agree?
3
RA failed and TLA is low what happens?
Landing gear warning ( can be canceled )
Gear retraction in-flight breaking is controlled by?
Mains: hydraulic system
Nose: mechanical stops ( metal )
What stops landing gear from retracting on ground?
Mechanical lock ( Red button on gear handle )
What are the functions of the nose gear proximity switch? (2)
1) steering
2) thrust reversers
When is the only time you can cancel “Landing Gear Warning”?
In case Radio Altimeter loss Flaps 0-9
Canceled through the LDG cut out button
