737 Systems: Landing Gear

Question 1

Under normal conditions, which system powers the landing gear?

Answer 1

System A

Question 2

Describe how tires are protected from explosion during thermal expansion caused by hot brakes?

Answer 2

There are 4 thermal fuse plugs in each inner wheel half (On the MAINS ONLY), which melt at 177C to release pressure

Question 3

When is the landing gear locked?

Answer 3

On the Ground

Question 4

Can the landing gear lock be overridden?

Answer 4

Yes, with the Level Lock Override Trigger in certain conditions

Question 5

What do the red position lights on the forward landing gear panel indicate?

Answer 5

-When gear is in disagreement with the position of the Landing Gear Lever
-Landing gear is not down and locked (with thrust levers at idle, <800ft AGL)

Question 6

What do the green position lights on the forward landing gear panel indicate?

Answer 6

Indicate the gear is down and locked.

Question 7

What is the purpose of the aft overhead panel Supplemental Landing Gear indicator lights?

Answer 7

To give a secondary indication on whether the gear is down and locked

Question 8

What protects the aircraft from loose tread or FOD in the main wheel well during landing gear retraction?

Answer 8

Frangible Fitting, which when broken will release hydraulic pressure from the associated landing gear and free fall into the down and locked position

Question 9

If the Number 1 engine fails, how is the hydraulic capability of system A affected?

Answer 9

It uses the electric pumps, which has a lower output than the engine driven pump

Question 10

With Engine 1 failed, how is the gear raised at a normal rate?

Answer 10

Through the Landing Gear Transfer Valve which allows the B system to assist. This activates automatically IF:
-Airborne
- ENG 1 N2 < 50%
-LANDING GEAR lever is UP
-EITHER Main gear is not up and locked

Question 11

When is Nosewheel Steering active?

Answer 11

Nose Gear is down and compressed

Question 12

If Normal and Alternate Brake pressure is lost, how is braking accomplished? Are there any limitations?

Answer 12

With the Accumulator, and you will only get 6 applications or 8 hours of applied parking brake

Question 13

Which hydraulic systems can pressurize the parking brake?

Answer 13

A or B or the Accumulator

Question 14

Which brake systems have anti-skid?

Answer 14

Normal, Alternate, and Accumulator Brake Systems

Question 15

Is the Alternate Brake System capable of supplying auto brakes?

Answer 15

No

Question 16

When can RTO Braking be armed?

Answer 16

-Aircraft on ground
-Antiskid and Autobrake system operational
-AUTOBRAKE select switch positioned to RTO
-Wheel speed <60kts
-Thrust levers positioned to IDLE

Question 17

When is RTO Braking available?

Answer 17

-Wheel speed > 90kts
-Thrust levers IDLE

Question 18

What does a Parking Brake Warning light indicate?

Answer 18

That the Parking Brake SOV is not FULLY open