Chapter 4

Question 1

What do redundancy components do

Answer 1

Built in to prevent failure in components and software

Question 2

What is altitude

Answer 2

Measurement of vertical distance above the set barometric pressure

Question 3

How is altitude measured

Answer 3

Altimeter uses static pressure

Question 4

What is the greatest disadvantage to altimeters

Answer 4

Doesn’t show the pilot height above the ground

Changes with location and time

Question 5

What has been introduced to solve problems with the Altimeter

Answer 5

Radar Altimeter ( RadAlt)

Question 6

What is RadAlt

Answer 6

Emits pulses towards the ground , which reflect and give the aircraft a accurate measurement of height above ground

Question 7

Disadvantages of RadAlt

Answer 7

Effective only up to 5000 feet

Question 8

How is airspeed indicated

Answer 8

Pitot pressure

Static + Dynamic pressure fed into capsule

Contracts or expands , directly linked to the needle

Question 9

How is AOA measured

Answer 9

Gauges fitted to the outside of the aircraft

Measure Angle in comparison to side of fuselage

More than one fitted as a level of redundancy

Question 11

What does the attitude indicator give the pilot

Answer 11

A reference to the horizon

Good on cloudy / low visibility days

Question 12

How is Attitude measured

Answer 12

With a gyroscope

Question 13

How is wind speed calculated

Answer 13

Direction is measure in degrees from N

Calculated by comparing Air speed to ground speed

Question 14

What are the three basic Air data measurement sensors that are attached to the external surfaces

Answer 14

Static pressure

Pitot or total pressure

Total or indicated air temp

Question 15

From the three basic air data measurement what can be calculated

Answer 15

Pressure altitude
Vertical speed
True airspeed
Mach number
Air temp

Question 16

Where does the data from the Air data computers distribute

Answer 16

Flight controls
Engine control units
Nav systems
Weapons aiming systems

Question 17

What are micro switches

Answer 17

A small movement that is required to activate a switch rather than the size of the switch

Question 18

Where are examples of micro switches

Answer 18

Door activation
Weight on wheels
Limit switches
Proximity
Soft switches

Question 19

What are synchros

Answer 19

Measure the angle of a rotating machine such as an antenna angle

Question 20

What principle does a potentiometer work

Answer 20

The amount of resistance across any portion of a wire of constant cross-section is directly proportional to the length of that portion

Question 21

What is tacho generator

Answer 21

Produces electrical power from mechanical energy , usually a turning shaft

Question 22

What are thermocouples

Answer 22

Measures temperature

Constructed of 2 dissimilar metals which form an electrical junction

Question 23

What is pyrometer

Answer 23

Remote sensing thermometer used to measure the temperature of a surface

Uses thermal radiation of light as a measure of temp

Question 24

What is a pressure sensor

Answer 24

Most common bourbon tube
Closed end attached to pointer on calibrated scale
As pressure rises the tube straightens out

Question 25

How is Flow rate sensed

Answer 25

1. Incorporate an impeller within a liquid flow 2. Impeller has a magnet mounted upon it 3. As it’s turned the magnet produces a voltage within a collocated coil 4. Voltage reading proportional to flow rate

Question 26

What is the hazards to antenna and aerials

Answer 26

Radio frequency burns when transmitting

Question 27

How does an Antenna and aerial work

Answer 27

Radio transmitter supplies an electric current to the antenna Consequently antenna radiates the energy produced by the current as electromagnetic waves Antenna intercepts electromagnetic waves of appropriate phase

Question 29

Describe Electro optics and there uses

Answer 29

What : provides visual aid to pilots How : amplify the light available to provide a viewable image Why: aid in surveillance and recon

Question 30

What is a forward looking Infrared

Answer 30

Non contact device Detects infrared energy and converts it into electronic signal Processed to produce thermal image on video monitor

Question 31

What does FLIR stand for

Answer 31

forward looking Infrared

Question 32

How does Infrared aid pilots

Answer 32

Produces image in complete darkness Fed to pilots head-down and head up display or helmet visors

Question 33

What is Infrared search and track

Answer 33

Offers all - round situational awareness Uses sensitive optics Can be combined with RADAR data

Question 34

What are the two types of compasses

Answer 34

Direct indicating Remote indicating

Question 35

What are the problems involving DIC ( Direct indicating )

Answer 35

Cannot give data to nav system , read only Data cannot be repeated to other stations on aircraft Electrical systems interfere with magnetic fields

Question 36

What do turn and slip indicators indicate

Answer 36

Lateral attitude in straight flight - gyro Direction and rate of turnabout its vertical Amount of slip arising from an incorrect angle of bank

Question 37

What indicates the turn and slip on the instrument

Answer 37

Lateral attitude - gyro Direction and rate of turnabout - the needle further across the instrument greater the turn Amount of slip- a ball in a glass tube full of liquid ( spirit level)

Question 38

How does a ADI differ to an artificial horizon

Answer 38

Has cursor that indicates a desired direction and attitude

Question 39

What does ADI stand for

Answer 39

Attitude and Direction indicator