Landing Gear Flashcards
The 777 is equipped with …………… nose gear?
Conventional
Main landing gear is attached ?
To the wings
Which pair of wheels on each truck is steerable?
The aft
The main landing gear ………. for retraction & after extension
Tilt
Landing gear speed limitations?
270 kts or .82 Mach when the landing gear are down, & during extension & retraction
……………….. hydraulic system pressure opens & closes the heat doors
Centre.
It also retracts the nose & main landing gear.
Hydraulic pressure is removed after the landing gear & gear doors are up & locked.
Hydraulic pressure forces the landing gear into ………………… during retraction& unlocks the landing gear for ………………….
Mechanical locks, extension
One unlocked, the landing gear ………………………………….. Hydraulic pressure ………….. needed for the landing gear to extend
Free fall to the down position.
Is NOT
If the airplanes air/ground sensing system remains in ground mode, what can’t you do?
Cannot raise the landing gear
What unlocks the landing gear in any phase of flight?
The landing gear lever lock switch
If there’s no hydraulic pressure in the centre system, or when the gear hasn’t extended properly, how can you extend the gear?
Alternate gear extension
How does the alternate gear extension system work?
It uses an electrically powered hydraulic pump & centre hydraulic system fluid to unlock the landing gear & landing gear doors
When the Alternate Gear Extension has been used, what’s different about the sequencing?
Landing gear & gear doors extend without sequencing. The landing gear do not tilt.
When does the landing gear display extend to show all gear positions?
If the landing gear doesn’t extend in the normal transit time.
To activate the alternate gear switch you must push & hold the switch for at least …………..?
1 second
Even if there is Centre hydraulic pressure available, the landing gear doors …………………. after alternate extension
remain open
Can you retract the landing gear following alternate gear extension?
Yes, if Centre hydraulic system pressure is available
Rudder pedals turn the nose wheels up to …. degrees?
7 degrees
Tillers turn the nose wheels up to …… degrees
70 degrees
What has priority for steering?
Tillers override the rudder pedals if they are used at the same time.
Which wheels are steerable?
Steerable Nose Wheels &
Steerable Main Aft Axle Wheels
Main gear aft axle steering operate when the ?
When the nose wheels are turned approximately 13 degrees or more.
Therefore, main gear steering is controlled only by the tiller.
The main gear aft axle wheels turn in the …….(same/opposite)…. direction of the nose wheels?
Opposite direction
What does a ‘MAIN GEAR STEERING’ EICAS message indicate?
The msg appears if either main gear aft axle is unlocked when it should be centred.
The Centre hydraulic system powers ?
Nose wheel & main gear steering (among other things)
If the Centre hydraulic system fails, what powers the nose wheel steering?
Reserve fluid from the Centre system
The tail skid retracts & extends along with the landing gear & is connected to?
The centre hydraulic system
