Landing Gear/ Brakes

Question 1

Describe the mechanism that locks the MLG and NLG in the down position

Answer 1

MLG: Locking Ring internal to the actuator
NLG: Over-centered Spring Loaded Locking Stay mechanism

Question 2

What action unlocks the MLG and NLG during retraction?

Answer 2

MLG: Hydraulic pressure applied to the retract side of the actuator

NLG: Hydraulic pressure applied to the Downlock Release Actuator releases Locking Stay Mechanism

Question 3

Describe the mechanism that locks the MLG and NLG in the up position

Answer 3

MLG: Hook attached to Uplock Box

NLG: Hook attached to Uplock Box

Question 4

What action unlocks the MLG and NLG during extension?

Answer 4

MLG/NLG Hydraulic pressure applied to Uplock Box Release Actuators

Question 5

What actions occur when the Gear Emergency Extension Handle is pulled?

Answer 5

• Uplock Box Hooks are mechanically released
• Hydraulic fluid in all Landing Gear lines is opened to Hydraulic Return

-Landing Gear extends to the locked position through Gravity and Aerodynamic Force

Question 6

What criteria must be met to trigger the gear aural warning with the flaps in UP, 1, or 2 position?

Answer 6

At least one Landing Gear not down and all the following:
- Altitude less than 700 LFE OR 700 AGL
- Airspeed less than 160 KTS
- One Thrust Lever Angle less than 26 degrees with the other less than 40 degrees (All engines operative)
- Thrust Lever Angle less than 40 degrees (One engine inoperative)

Question 7

What criteria must be met to trigger the gear aural warning with the flaps in 3 or FULL position?

Answer 7

At least one Landing Gear not down, regardless of Altitude, Airspeed, or Thrust Lever Angle.

Question 8

Under what conditions can the gear aural warning not be silenced?

Answer 8

Flaps in 3 or FULL position

Question 9

What types of Brake/ Wheel protection are provided by the Brake Control Unit?

Answer 9

• Anti-skid Protection
• Locked Wheel Protection
• Touchdown Protection
• Retraction Braking
• Integrated Built in Test

Question 10

Is Anti-skid protection available when using the Emergency Brake Handle?

Answer 10

No

Question 11

Can the Emergency/ Parking Brake accumulator be charged without system pressure?

Answer 11

No

Question 12

How many parking brake applications are available with a full accumulator charge?

Answer 12

6

Question 13

What is the minimum required cooling period following an aborted takeoff or landing above the Quick Turn- Around Weight?

Answer 13

20 Minutes

Question 14

Reference the source for brake cooling periods

Answer 14

POH Vol 2- Performance