Chapter 14 - Landing Gear

Question 1

What is the maximum nose wheel steering angle with the tiller? With the rudder pedals? When will the body gear steering move?

Answer 1

• 70 degrees

• 7 degrees

• 20 degrees of tiller angle or more

Question 2

With the autobrake selector set for landing, what will cause them to disarm?

Answer 2

• Move the any thrust lever forward after landing

• Move the speedbrake lever down

• Apply manual braking

• Select DISARM or OFF

• An autobrake system fault

• Normal antiskid system fault

• Loss of normal brake system pressure

Question 3

What is the maximum speed for landing gear extension? Operation?

Answer 3

• 270 knots / Mach .82

• 320 knots / Mach .82

Question 4

At what speed does the body gear steering disarm?

Rearm on landing?

Answer 4

• Disarm at 20 knots accelerating

• Rearm at 15 knots decelerating.

Question 5

What does the EICAS message “GEAR TILT” mean?

Answer 5

• At least one main landing gear is not tilted.

• Do not retract the landing gear

Question 6

The BRAKE SOURCE light is illuminated. What does this mean?

Answer 6

Systems 4, 1 and 2 ALL have low pressure.

Question 7

The autobrakes are set to RTO. You initiate a rejected takeoff at 100 knots. What happens?

Answer 7

The autobrake system will apply 3,000 PSI to the main wheel brakes until the aircraft reaches a full stop.

Question 8

What does a white hashed box displayed on the expanded gear position indicator indicate?

Answer 8

The associated landing gear is in transit.

Question 9

In what order must the landing gear be extended using the alternate system?

Answer 9

No specific order is required. Press both alternate gear extension switches simultaneously.

Question 10

The autobrakes are set to 2. What would be the effect of idle reverse thrust versus normal reverse thrust (70%) use on landing?

Answer 10

The selection of 2 with the autobrake selector selects a specific deceleration rate. Autobrake pressure is reduced with the use of reverse thrust.

Question 11

Do we use Auto Brake 1? Why?

Answer 11

No

Because they do not heat up the brakes for optimum use.

Question 12

RTO activates when?

Answer 12

When speed is greater than 85kts and

Thrust levers 1 & 3 are reduced to idle

Question 13

How do we use the ALT Gear Extension?

Answer 13

Gear handle stays off
ALTN button releases up-lock & doors un-latch
Gravity extension for affected gear
Normal extend with gear handle for unaffected gear
EICAS expanded mode with ALT ops

Question 14

When do speed brakes deploy if armed?

Answer 14

1 and 3 thrust levers to idle

Ground sensing

Question 15

When do speed brakes deploy if not armed?

Answer 15

1 and 3 thrust levers idle
2 and 4 at idle reverse

Question 16

What braking protections are on the 747?

Answer 16

Antiskid protection

Touchdown protection

Hydroplaning protection

Locked Wheel protection

Question 17

Which hydraulic systems are used to actuate the landing gear?

Answer 17

System 1 for nose and body gear

System 4 for wing gear

Question 18

The brake accumulator is only pressurized by which hydraulic system?

Answer 18

System 4

Question 19

The landing gear lever lock prevents movement of the landing gear lever to the UP position unless?

Answer 19

Body gear are centered and main gear are tilted

Question 20

In alternate mode, landing gear is actuated by what?

Answer 20

By gravity and air-loads, with electrical release

Question 21

When operating with landing gear extended (ie. dispatched gear ‘pinned down’ or unable to retract gear after departure), the following restrictions apply:

Answer 21

Prohibited to operate in RVSM airspace or more than 50 nm from shore