Landing Gear 747-400

Question 1

When is the body gear steering active and deactivated?

Answer 1

During taxi:
Above 15kts, and deactivated and centered above 20kts.

During landing: Below 15 kts

Question 2

During rudder pedal steering is the body gear active, and why?

Answer 2

No, only when the nose gear steering exceeds 20 degrees.

Question 3

What hydraulic system controls the normal brake system?

Answer 3

Hyd system 4

Question 4

What hyd systems supplies the nose and body, and what supplied the wing?

Answer 4

System 1 - Nose and body

System 4 - Wing

Question 5

What is the precharge pressure of the brake accumulator?

Answer 5

800 PSi

Question 6

During landing, one wheel is skidding during landing. What will the anti-skid do to correct this?

Answer 6

It will release the skidding wheel.

Question 7

How does the Anti-skid touchdown protection prevent locked wheels during touchdown?

Answer 7

It compares IRS groundspeed to wheel speed.

Question 8

What does 800Psi brake pressure mean?

Answer 8

That there is insufficient pressure for the brakes.

Question 9

What are the actions that disarm the autobrakes?

Answer 9

One of the following:

1) Pressing the brake pedals
2) Speed brake lever moved to DN after ground deployment.
3) Any TL advanced after landing
4) Autobrakes selector to disarm.