Day 1 Lecture

Question 1

Fixed Landing Gear Purpose

Answer 1

Simple Design and Lightweight

Question 2

Fixed Landing Gear are used for ____ powered aircraft

Answer 2

Recip

Question 3

Fixed Landing Gear are not worried about ____ because they have ____ ____

Answer 3

Drag
Low Speed

Question 4

Retractable Landing Gear Purpose

Answer 4

No Drag

Question 5

Retractable Landing Gear are used on ____ ____ aircraft

Answer 5

Higher Speed

Question 6

Most aircraft equiped with retractable Landing Gear are _____

Answer 6

Commercial

Question 7

There are 6 configurations

Answer 7

Conventional

Tricycle

Seaplanes/amphibians

Skiplanes

Helicopter

Multiple wheeled

Question 8

There are ____ Tandem and ____ Tandem Rows of landing gears.

Answer 8

Single
Double

Question 9

Conventional Design Now incorporates a ______

Answer 9

tailwheel

Question 10

Conventional Design ____ ____ carried majority of weight

Answer 10

Main Gears

Question 11

Conventional Design Originally has “___ ___” on rear for stability for unpaved runways

Answer 11

tail skid

Question 12

Conventional Design C.G. _____ wheel

Answer 12

behind

Question 13

Conventional Design have ____ ____ for turning “S” Turns and Ground Loops!!

Answer 13

Differential Braking

Question 14

Most common in use for transport aircraft

Answer 14

Tricycle Design

Question 15

Tricycle Design C.G. is between ____ and ____ wheels

Answer 15

Main
Nose

Question 16

What design Allows for heavier aircraft

Answer 16

Tricycle Design

Question 17

What design Utilizes Nose Wheel Steering for turns

Answer 17

Tricycle Design

Question 18

Hull watertight (Corrosion Largest Concern)

Landing Gear retract into fuselage

Answer 18

Amphibians

Question 19

Wheels replaced with FLOATS

Aluminum or fiberglass

Rudders installed on back of floats for water taxi

Answer 19

Seaplanes

Question 20

Used for artic or snow operations

Wheels replaced with SKIS

Aluminum or fiberglass

Some may incorporate retractable skies

Answer 20

Skiplanes

Question 21

Most common design

Hydraulic dampeners may be used for shock absorption

Can incorporate ground handling wheels

Answer 21

Skid-Type

Question 22

Helios that are not exposed to landing in unimproved areas

Caster-type nose wheel (tricycle design)

Answer 22

Fixed-wheel gear

Question 23

Military and Heavy transport (possible)

Answer 23

Retractable-wheel gear

Question 24

2 wheels attached to a beam on one strut

Seldom one bogie is used

Answer 24

Bogie

Question 25

2 Bogies Strut consist of an Air/Oil design (OLEO)

Answer 25

Truck

Question 26

Usually used with Tricycle design Heavy weight applications Two or more wheels per strut

Answer 26

Multiple Wheeled Landing Gear

Question 27

Also Called Shock Cord Small airplanes (rubber band with fabric covering) Requires special tooling to replace cords

Answer 27

Bungee Cord

Question 28

So called “Cessna Type Gear Legs” Made of Spring Steel

Answer 28

Leaf Type

Question 29

Most common (and complex) type for Transport Absorb heavy impact on landing and taxiing

Answer 29

Shock Strut (OLEO)

Question 30

Compressible – absorbs shock during taxiing Dry and non- combustible Keeps strut extended (static) Amount of Chrome showing (air in strut)

Answer 30

air

Question 31

Incompressible – Fluid Contained in bottom chamber Piston rises due to landing forces fluid through metered orifices to upper chamber (dynamic)

Answer 31

Oil

Question 32

Designed to control the flow of fluid from one chamber to another.

Answer 32

Metering Pin or Plunger

Question 33

Cheveron Seal– Prevents oil from escaping(one way) Wiper/Scraper – keeps debris out of strut

Answer 33

Seals

Question 34

Simple and Complex design (Aircraft use Complex) Uses Air (N2) and Oil (usually MIL-H-5606)

Answer 34

Shock Strut Construction

Question 35

Check for leakage, proper air pressure, and cleanliness IAW AMM Lint-free cloth moistened with proper hydraulic fluid to wipe down exposed chrome

Answer 35

Shock Strut Maintenance

Question 36

Medium Pressure (A) Valve Core (similar to auto) High Pressure (B) No Valve Core Schrader Valve

Answer 36

AIR VALVES

Question 37

Fluid level extremely low or entrapped air Follow Aircraft AMM/Service manual for proper procedure Typical Procedure Construct a bleed hose to make an airtight connection to filler opening (tool part number) Jack aircraft until struts extended Release air pressure and remove air valve assembly Fill strut to proper level with proper hydraulic fluid Attach bleed hose and insert free end into a container of clean hydraulic fluid Place exerciser jack under strut, compress and extend strut (allow to extend with own weight) Remove jack and bleed hose, install air valve and inflate strut

Answer 37

Bleeding/ Servicing Shock Struts

Question 38

Shock Strut Troubleshooting no chrome exposed while plane is still

Answer 38

Low Nitrogen

Question 39

Shock Strut Troubleshooting Strut “bottoms out” during landing

Question 40

Shock Strut Troubleshooting Strut “bottoms out” during taxiing

Answer 40

Low Nitrogen