900 Landing Gear

Question 1

How is the landing gear controlled?

Answer 1

Hydraulically actuated and electrically controlled by the proximity sensing system (PSS)

Question 2

How is the main landing gear held up when retracted?

Answer 2

Mechanical uplocks

Question 3

How is the gear held down in the extended position?

Answer 3

Locking mechanisms in the main landing gear side strut actuators

Question 4

What happens when the gear is retracted?

Answer 4

• Landing gear solenoid is released
• landing gear selector valves energized to release downlocks
• uplocks are engaged when gear is fully retracted

Question 5

What happens when the gear is extended?

Answer 5

• Landing gear selector valves energized to release uplocks

- landing gear downlocks are hydraulically and mechanically engaged

Question 6

Nose wheel steering limit?

Answer 6

80°

Question 7

Rudder steering limit

Answer 7

8°

Question 8

What type of tires are on the nose wheel?

Answer 8

Chine tires that help redirect water from the engines

Question 9

What powers the inboard and outboard brakes?

Answer 9

Inboard - hydraulic system # 3

Outboard - hydraulic system # 2

Question 10

What stops the main wheels from spinning on gear retraction?

Answer 10

Hydraulic pressure from the nose landing gear is applied to the brake control valves

Question 11

What does stopping the wheel rotation accomplish?

Answer 11

Eliminates the gyroscopic precession caused by the spinning wheels

Question 12

With loss of hydraulic system 1 and 2, will you have braking?

Answer 12

Yes, 6 brake applications with the anti-skid off supplied by the accumulators

Question 13

How must the brake wear indicators be checked?

Answer 13

Brakes applied and hydraulic systems # 2 and 3 pressurized

Question 14

Which brakes will hold for a prolonged period with the parking brake set?

Answer 14

The inboard brakes

Question 15

Minimum wheel speed for anti-skid operation

Answer 15

10 knots

Question 16

When is the anti-skid operation on landing?

Answer 16

Wheel speed of 35 knots or WOW signal plus 5 seconds

Question 17

After detection of an overheated brake, will the box remain red?

Answer 17

Yes, the reset push button must be pressed

Question 18

When will you receive the “too low gear” aural warning?

Answer 18

If any landing gear is not down and locked below 500 feet RA and below 190 KIAS

Question 19

How long after takeoff is the landing gear config inhibited?

Answer 19

2 minutes after weight on wheels to weight off wheels is sensed

Question 20

When are brake temperature and gear indications removed from the EICAS?

Answer 20

30 seconds if:
Gear is up and locked
Flaps are up
BTMS indications normal

Question 21

When do landing gear, BTMS indications, and flaps reappear?

Answer 21

• Red BTMS indication

- Selecting flaps or landing gear

Question 22

What powers the landing gear and nose wheel steering?

Answer 22

Hydraulic system #3