Airframe 3

Question 1

What components are in a vapor cycle cooling?

Answer 1

Receiver dryer

Evaporator

Compressor

Condenser

Expansion valve

Question 2

Why is oil added to a vapor cycle Freon system?

Answer 2

To seal and lubricate the compressor

Question 3

What is the function of ventilating air in a combustion heater?

Answer 3

It transports heat from the heater into the cabin AND prevents combustion gases from entering the cabin if the combustion chamber develops a crack

Question 4

Who is authorized to apply the range markings to an instrument dial face?

Answer 4

Manufacturer or certified instrument repair station

Question 5

What does a yellow arc on an instrument dial indicate?

Answer 5

Caution

Question 6

Why are slippage marks used on instruments glass covers?

Answer 6

To indicate glass rotation in the bezel. If the glass rotates, the range markings will be off.

Question 7

What references should be consulted to determine the proper range markings for aircraft instruments?

Answer 7

Aircraft maintenance manual

Aircraft flight manual

Type certificate data sheet

Aircraft specifications

Question 8

When range markings are placed on an instrument glass what precaution must be taken?

Answer 8

The glass must be marked for slippage indication

Question 9

What is required after replacement of components connected to a pitot static system?

Answer 9

A leak test

Question 10

What is the meaning of swinging a compass?

Answer 10

Correcting for deviations by adjusting the compensating magnets

Question 11

Name at least two items that should be looked for during an inspection of a magnetic compass

Answer 11

Security of attachment

Correct readings at various headings

The bowl should be full and without bubbles or discoloration

The scale should be readable

Moving parts should work easily

Question 12

In what way do magnetic fields generated by electrical equipment and steel parts in the airplane affect a magnetic compass?

Answer 12

They deflect the compass from correct alignment with the earths magnetic field

Question 13

What quantity is accurately measured by capacitance type fuel, quantity indicating system?

Answer 13

The mass of the fuel

Question 14

What are the basic auto pilot components?

Answer 14

Sensing elements (gyros)

Output elements (servos)

Command elements (flight controller)

Computing elements (computer and amplifier)

Question 15

What are the sensing elements of an auto pilot system?

Answer 15

Attitude and indicator gyro

Directional Gyro indicator

Turn and bank coordinator gyro

Altitude control sensor

Question 16

What are the actuating elements of an auto pilot system?

Answer 16

Servos that operate the control surfaces

Question 17

What is the function of the servo’s in an auto pilot system?

Answer 17

To actuate the flight controls

Question 18

What is the most common communication system in use?

Answer 18

VHF band 118.0 to 136.975 Mhz

Question 19

What is VOR equipment used for?

Answer 19

Navigation

Question 20

What are the components of a typical VOR system?

Answer 20

Receiver

Visual indicator

Frequency selector

Antennas

Power supply

Question 21

What is an ADF?

Answer 21

Automatic direction finder

Question 22

Why are two antennas or a single multi element antenna usually required for an ILS system?

Answer 22

One is for the localizer and the other is for the glide-slope receivers

Question 23

What information does a glideslope radio beam provide?

Answer 23

Vertical guidance for correct angle of descent

Question 24

What is a DME?

Answer 24

Distance measuring equipment

Question 25

Where should DME antennas be located?

Answer 25

Generally, on the bottom of the fuselage in a location that is not blocked by the wing

Question 26

What powers an emergency locator transmitter (ELT)?

Answer 26

An internal battery

Question 27

What is one method used to monitor the output signal during an ELT test?

Answer 27

A VHF communications receiver turned to 121.5 Mhz

Question 28

What time of day should you perform the maintenance tests of an installed ELT?

Answer 28

During the first five minutes after the hour for no more than three sweeps. At any other time tests should be coordinated with the nearest control tower of flight service station

Question 29

How often does the ATC transponder require certification?

Answer 29

Every 24 calendar months

Question 30

How may the determination be made to replace or recharge the batteries in an ELT even though the set operates?

Answer 30

An expiration date for replacing or recharging the batteries is marked on the outside of the transmitter and entered in the aircraft maintenance record

Question 31

What are the basic components of a radio communication system?

Answer 31

Microphone Transmitter Transmitting and receiving antennas Receiver Speakers or headphones

Question 32

Describe the shape and location of a transponder antenna

Answer 32

Either a short blade or a short wire with a ball and located on the top of the fuselage

Question 33

What is the purpose of a bonding jumper from the radio shock mount to the air frame?

Answer 33

To provide low impedance ground return

Question 34

Describe the procedure used to route coaxial cables from an antenna to a receiver

Answer 34

The cable should be routed separately from other wires and supported every 2 feet. Benz should be 10 times the cable diameter.

Question 35

Why should you wait a period of time after fueling before checking fuel sumps?

Answer 35

To allow time for water and sediment to settle to the drain point

Question 36

What should be done with old gaskets and seals when replacing fuel systems components?

Answer 36

Old gaskets and seals should be replaced by new ones

Question 37

What method may be used to check a fuel tank for leaks after a weld repair has been performed?

Answer 37

Pressurize the tank with 1/2 to 3 psi air pressure and use a soapy solution to detect any leaks

Question 38

What are drip gauges and sight gauges?

Answer 38

Underwing bayonet type fuel gauges

Question 39

Is it possible for a fuel system to develop a leak that has no visible evidence such as a stain or spot and if so, how?

Answer 39

Yes. An internal component such as a valve or pump could develop a leak.

Question 40

Name some advantages to a single point fueling system

Answer 40

Fueling time is reduced Risk of contamination is reduced Risk of fire is reduced Eliminate damage to the aircraft skin

Question 41

What controls the output voltage of an alternator?

Answer 41

The GCU (generator control unit)

Question 42

What factors are considered when selecting wire size for electrical power?

Answer 42

Permissible voltage drop System voltage Wire length Current wire will carry Whether the load is continuous or intermittent

Question 43

What should be done to a conduit when fittings are not used?

Answer 43

It should be deburred to prevent insulation damage

Question 44

How many terminal lugs can be put on a single terminal strip stud in an aircraft?

Answer 44

4

Question 45

When do DC motors draw several times their rated current?

Answer 45

When starting

Question 46

When is a circuit breaker designed to open?

Answer 46

When an overload or circuit fault exists, and before the wire emits smoke

Question 47

What type of circuit breaker should not be used in aircraft?

Answer 47

Automatic reset type circuit breakers

Question 48

What could cause an AC electric motor to run too fast?

Answer 48

Excessive applied voltage or shorted field windings

Question 49

How is the output voltage of an alternator controlled?

Answer 49

By varying the field current that excites the alternator

Question 50

What instruments are used to monitor electrical system loads?

Answer 50

Ammeters and voltmeters