Lesson 9: SHOCK STRUT AND MAINTENANCE

Question 1

Spring steel, composite, rigid, rubber donuts and bungee chord are all examples of what?

Answer 1

Non-Absorbing gear

Question 2

What is the most common aircraft shock strut?

Answer 2

Air-Oil Shock Absorber

Oleo-pneumatic strut

Question 3

What is the purpose of the TORQUE LINK?

Answer 3

Keeps the PISTON/SLIDING TUBE aligned in the CYLINDER

Question 4

What do we service oleo struts with?

Answer 4

NITROGEN

MIL-5606 (RED)

Question 5

Where is the outer cylinder attached to?

Answer 5

Aircraft structure

Question 6

This part is attached to the top of the OUTER CYLINDER

Answer 6

Piston tube/centre tube

Question 7

What does the PISTON (sliding tube) do?

Answer 7

Moves vertically between the Outer Cylinder and the Piston Tube

Question 8

What is the Piston (sliding tube) supported by?

Answer 8

Upper and Lower Bearings

Question 9

This part holds everything together with the Outer Cylinder

Answer 9

GLAND NUT or TORQUE LINKS

Question 10

How are the upper and lower chambers separated?

Answer 10

ORIFICE PLATE built into the Piston/Centre tube

Question 11

What is the purpose of the NITROGEN in the upper chamber of the shock strut?

Answer 11

Shock absorber and force piston to full extension during WoffW

Question 12

This component acts as a damper,controlling the rate the piston extends and retracts

Answer 12

Hydraulic fluid

Question 13

What REGULATES the rate of FLUID transfer?

Answer 13

Metering Pin / Clack Valve

Question 14

What other part assists in the damping, reduction of bounce?

Answer 14

Recoil Chamber

Question 15

What component acts like an orifice check valve, allowing free flow in one direction and restricted flow in the opposite direction?

Answer 15

Clack Valve

Question 16

What are CENTERING CAMS and what do they do?

Answer 16

• Engage when nose gear strut is extended in flight mode

- Ensures wheels are straight for retraction

Question 17

What is the position of the cam when towing?

Answer 17

NOT engaged

Question 18

If there is excessive chrome on the nose gear what could have happened?

Answer 18

Tail heavy loading

Strut over inflation (too much N)

Question 19

If there is an imbalance between the main gears what could have happened?

Answer 19

Fuel load imbalance

Strut servicing issues

Question 20

What does the bounce test identify?

Answer 20

Fluid level

Question 21

Excessive bounce means what?

Answer 21

LOW FLUID level

Question 22

Not enough bounce means?

Answer 22

TOO MUCH FLUID

Question 23

Exposed piston measurement is related to what?

Answer 23

N pressure
Aircraft weight
Local Temp

Question 24

REFER TO PP FOR OLEO STRUT SERVICING

Answer 24

SMALL AND LARGE AIRC.