Lesson 8: INTRO AND DESIGN

Question 1

What is the purpose of a landing gear?

Answer 1

• CONTROL/STABILITY while on ground
• ABSORB loads during takeoff/landing
• No VIBRATIONS

Question 2

Landing gears must have what?

Answer 2

MECHANISM to absorb LANDING/WEIGHT

Question 3

For light aircraft what do they use on their main struts and what do they use on their nose gears?

Answer 3

Spring steel for MAIN

OLEO shock absorber for NOSE

Question 4

What do large aircraft use on their nose/main?

Answer 4

OLEO shock absorber for ALL

Question 5

Retractable landing gear is used mostly for what type of aircrafts?

Answer 5

LARGE and high SPEED

Question 6

How do we prevent collapsing with WOW on RETRACTABLE landing gear?

Answer 6

OVER CENTRE mechanical lock down design

Question 7

What are the 3 types of landing gear arrangement?

Answer 7

Tricycle
Conventional
Tandem

Question 8

Tricycle gear is most popular for?

Answer 8

higher speed engines

Question 9

Why do higher speed aircraft have RETRACTABLE gear?

Answer 9

Aerodynamic Efficiency

Question 10

How do small aircraft nose/tail wheel steer?

Answer 10

Rudder pedals

Question 11

How do large aircraft steer?

Answer 11

hydraulic steering actuators
steering tiller
rudder pedals

Question 12

Describe CONVENTIONAL gear?

Answer 12

2 wheels fwd of the CofG and a small wheel at the back

Question 13

Describe TANDEM gear?

Answer 13

nose and main on CENTRE LINE with outrigger wheels

Question 14

What gear is used for gliders and military?

Answer 14

Tandem

Question 15

What is an advantage of SPRING STEEL?

Answer 15

No matter how much it deforms it always comes back

Question 16

What are the components of a SMALL aircraft NOSE gear?

Answer 16

Steering input
Shimmy Damper
Oleo strut (piston)
Torque Link
Axle

Question 17

What is the purpose of a Torque Link?

Answer 17

Keeps the AXLE aligned

Question 18

Where are the Torque Links located?

Answer 18

TOP of CYLINDER assembly and to the BOTTOM of the PISTON/AXLE assembly

Question 19

What are components of a LARGE aircraft landing gear?

Answer 19

Cylinder Assembly
Side Strut (brace)
Drag Strut (brace)
Down-lock Linkage
Lock Actuators/Springs
Retract Actuator

Question 20

Purpose of the CYLINDER assembly?

Answer 20

MAIN structural landing gar support

outer case for piston

Question 21

This component provides LATERAL support and splits into upper/lower to provide PIVOT points for RETRACTION

Answer 21

Side Strut

Question 22

What is the purpose of a DRAG STRUT?

Answer 22

LONGITUDINAL support for gear RETRACTION

Question 23

This component PREVENTS the SIDE STRUT from folding

Answer 23

Down-Lock Linkage

Question 24

What is the purpose of ACTUATORS and SPRINGS?

Answer 24

Helps in locking/unlocking the DOWN LOCK

Question 25

What is it called when the main gear has 2 or more axle SUPPORTS?

Answer 25

BOGEY/TRUCKS

Question 26

This component positions the gear in the correct geometry for entering the wheel well?

Answer 26

PITCH ACTUATOR

Question 27

What do SPIN DOWN PADS do?

Answer 27

Found in wheel well steering to STOP nose wheel rotation during RETRACTION

Question 28

Which way do nose gears RETRACT and why?

Answer 28

FWD into wheel well to help lock down

Question 29

Where do we use TAIL SKIDS?

Answer 29

Aircraft with LONG fuselage

Question 30

This component acts as a shock absorber for the tail

Answer 30

Tail Skid