Airframe 2

Question 1

What prevents a nose landing gear from being retracted with the nose wheel out of the center position?

Answer 1

Nose wheel, centering cams, or an external track

Question 2

When should a landing gear retraction check be accomplished?

Answer 2

During annual inspection

After landing gear replacement

After hard landings

During other programmed inspections

Question 3

What methods are used for transmitting cockpit control movements to a steering control unit in a large aircraft?

Answer 3

Mechanical, electrical or hydraulic

Question 4

What unit prevents nose wheel vibration?

Answer 4

Shimmy damper

Question 5

What prevents a split wheel from leaking air through the inner and outer mating surfaces or the wheel assembly?

Answer 5

An O-ring between the halves

Question 6

What is an indication of excessive heating of a wheel bearing?

Answer 6

Discoloration

Question 7

What is the purpose of a wheel fusible plug?

Answer 7

To relieve air pressure to prevent tire blowout

Question 8

What are some types of break actuating systems?

Answer 8

Independent master cylinders

Boosted brakes

Power brakes

Question 9

What is the purpose of an anti-skid system?

Answer 9

It prevents the wheels from skidding or locking during breaking attempts

Question 10

What are some methods of bleeding breaks?

Answer 10

Gravity and pressure

Question 11

What must be accomplished before inspecting a wheel brake system for hydraulic leaks?

Answer 11

Pressurize the system

Question 12

What is the most necessary maintenance function for safe operation and long aircraft tire service life?

Answer 12

Proper inflation

Question 13

What are the effects of under inflation on tires?

Answer 13

Uneven wear near the edge of the tread and creep when the brakes are applied

Question 14

What conditions should a mechanic look for during a regular inspection of the exposed piston section of a landing gear?

Answer 14

Cleanliness, damage, and proper extension

Question 15

What safety precaution must be taken when removing a wheel from an axle or when disassembling a wheel?

Answer 15

Verify the tire is completely deflated before removing or disassembling the wheel

Question 16

What are three types of hydraulic fluids?

Answer 16

Vegetable

Mineral

Phosphate esters

Question 17

Which color does mineral base and phosphate, ester hydraulic fluids have?

Answer 17

Mineral – red

Phosphate Ester – light purple

Question 18

What happens to plastic resin , vinyl compositions, lacquer and oil base paint if exposed to a phosphate base and hydraulic fluid such as skydrol?

Answer 18

They become damaged, softened, and/or peeled

Question 19

What precautions should be taken to minimize contamination during replacement of a hydraulic unit?

Answer 19

All lines should be plugged or capped after disconnecting

Question 20

What would cause a hydraulic filter to go into open by-pass, allowing unfiltered fluid into the systems?

Answer 20

A clogged filter

Question 21

What are two types of engine driven hydraulic pumps?

Answer 21

Constant delivery

Variable – delivery

Question 22

How does a gear type power pump operate?

Answer 22

Two meshed gears are driven by a power unit and rotate in a housing. Fluid is carried around the outside of the gears and delivered to the outlet side of the pump as the gears rotate.

Question 23

What feature is built into a hydraulic pump drive system to prevent engine damage in the event of a pump, seizure or overload?

Answer 23

A shear section of the pump drive shaft

Question 24

What is the purpose of a pressure relief valve?

Answer 24

Limit the amount of pressure to prevent damage to system components

Question 25

What is the purpose of a pressure regulator?

Answer 25

Manage the output of the pump to maintain system pressure and allow the pump to turn without resistance

Question 26

What is used in some hydraulic systems to supplement the power pump when several units are operated at the same time?

Answer 26

An accumulator

Question 27

What are the different types of accumulators?

Answer 27

Piston Diaphragm Bladder

Question 28

What must be accomplished with any accumulator prior to disassembling?

Answer 28

Make sure that the air side or preload has been discharged

Question 29

For what purposes are pneumatic systems used in some aircraft?

Answer 29

To operate brakes, doors, drive pumps and engine starting

Question 30

What are sources of pneumatic power?

Answer 30

Storage bottles Vane-type pumps Turbine engine compressor (bleed air)

Question 31

What happens to excessive pressure in a pneumatic system?

Answer 31

A relief valve bleeds it to the atmosphere

Question 32

What is the purpose of restrictions used in aircraft pneumatic systems?

Answer 32

To control the rate of flow

Question 33

Why should a pneumatic system be purged periodically?

Answer 33

To remove contamination and moisture

Question 34

What are the results of exposing lacquers, oil based paint, plastic, resin, and vinyl compounds to phosphate Ester based hydraulic fluid?

Answer 34

The materials will be damaged and/or softened, or the paint will peel

Question 35

Name several sources used to develop hydraulic pressure

Answer 35

Hand pumps Engine driven pumps Electrically driven pumps

Question 36

What types of components or systems are pneumatically operated in some aircraft?

Answer 36

Landing gear Brakes Flaps Other mechanical actuators

Question 37

Name several sources of pneumatic power

Answer 37

Storage bottles Engine bleed air Engine driven compressor Vane type pumps

Question 38

How does it continuous flow oxygen system operate?

Answer 38

Oxygen flows from a charged cylinder through a high pressure line to a reducing valve and to mask outlets

Question 39

How does a basic pressure demand oxygen system operate?

Answer 39

Oxygen flows from a charged cylinder to a pressure demand regulator that is adjustable by each crew member

Question 40

What type of oxygen must be used in aircraft?

Answer 40

Aviators breathing oxygen

Question 41

What must be accomplished if an oxygen system has been opened to atmosphere for two hours or more?

Answer 41

It must be purged to remove the moisture

Question 42

What is used to purge oxygen lines of moisture?

Answer 42

Dry air, dry nitrogen, or oxygen

Question 43

What safety precautions should be observed when servicing oxygen systems?

Answer 43

Make sure tools, clothing and hands are clean and grease free Do not smoke or have open flames within 50 feet Do not use adhesive tape of any kind

Question 44

What are the two groups of independent cabin compressors?

Answer 44

Positive displacement and centrifugal

Question 45

What is a roots blower?

Answer 45

An engine driven compressor (it is used in old reciprocating engines for cabin pressurization)

Question 46

What method is used by some turbine powered aircraft for pressurization?

Answer 46

Engine bleed air

Question 47

What pressurization control unit will regulate the position of an outflow valve?

Answer 47

Cabin pressure control controller

Question 48

What is the principle control for a pressurization system?

Answer 48

An outflow valve

Question 49

What is a vapor cycle cooling?

Answer 49

A closed system in which a refrigerant is circulated through tubing and other components to remove heat from the aircraft

Question 50

In what significant way is a vapor cycle cooling system different from an air cycle system?

Answer 50

Vapor cycle uses Freon