Power Points

Question 1

Purpose of thrust reversals

Answer 1

Increase aircraft stopping power with a significant increase In weight

Question 2

Benefits of thrust reversals

Answer 2

• Aid in braking and directional control during landing
• Back aircraft out of parking spots
• aid in emergency landing and takeoffs

Question 3

4 methods if thrust reversal

Answer 3

• hot jet
• cold jet
• hot and cold jet
• revrse pitch propellers

Question 4

2 types of operation thrust reversals

Answer 4

Mechanical
- clamshell
Areofynamic
- cascade vanes

Question 5

Thrust reversals safe guards

Answer 5

• can’t be selected until throttle at idle
• not normally selected until weight on wheels is activated
• engine power can’t be increased until thrust reversals are fully deployed
• automatically return to idle if forward thrust is selected while TR are deployed

Question 6

3 purposes of drive train system

Answer 6

Reduce speed
Increase torque
Provide drive for accessories

Question 7

Components mounted on accessory gearbox

Answer 7

• starter motor
• fuel pump
• FCU
• oil pump
• generator
• Tachometer generator

Question 8

Function of accessory gearbox

Answer 8

Provide mounting face and a means of drive for those components essential to start, sustain, monitor

Question 9

Turbojet noise supressors

Answer 9

Corrugated

Lobe type nozzle

Question 10

How do turbo jet noise reduction nozzles work

Answer 10

Changes the jet pattern reducing noise level

Question 11

Modular alignment methods

Answer 11

• spline drive
• serrated drive
• keys and keyway
• off set bolt holes
• dowels
• witness marks

Question 12

3 reasons for post maintenance activites

Answer 12

Prevent corrosion
Control deterioration
Eliminate physical damage

Question 13

Oil pressure system components

Answer 13

Tank
Pump
Filter
Relief valve
Oil jets

Question 14

Oil scavenge components

Answer 14

Strainer
Scavage pump
Oil cooler
Tank
Centrifugal breather

Question 15

Low pressure air uses [5]

Answer 15

Customer services
Cooling HP compressor
Cooling and pressurisation of bearings
Cooling accessories

Question 16

3 effects from icing

Answer 16

Decreased performance
FOD
Compressor surging/stalling

Question 17

3 methods of ice prevention

Answer 17

Hot air
Electric heating
Hot oil

Question 18

4 engine starting systems

Answer 18

Motor
Fuel sys
Ignition sys
Control sys

Question 19

5 types of starters

Answer 19

Electric 
Air turbine
Air impingement 
Gast turbine starter
Cartridge type

Question 20

Fire prevention methods [5]

Answer 20

Fire zones
Fire resistant materials
Explosion proof electrical equipment 
Drainage for leaks
External cooling and vents

Question 21

Fire extinguishing components

Answer 21

Discharge handle/buttons
Fire bottles 
Explosive cartridges 
Discharge nozzles 
Discharge indicators

Question 22

Fire discharge indicators

Answer 22

Electronic indicators
Skin panel indication (disks)
Mist smell
Indicators pins

Question 23

What cascade vanes do

Answer 23

Redirect escaping exhaust gasses forward

Question 24

Fuel flow measured in

Answer 24

Weight

Question 25

Braking force of thrust reverses

Answer 25

Proved 20% braking force under normal conditions

Question 26

How Turbo fans dampen noise

Answer 26

Insulating blankets/ absorbing material

Question 27

Define ram effect

Answer 27

Result of forward movement which cuases a pile up of air in the inlet. This increases the pressure therefore increases thrust

Question 28

Second operation of air inlet

Answer 28

Provide uniform supply of air to the compressor

Question 29

Shape of subsonic inlets and why

Answer 29

Divergent. Increase pressure and slow down velocity

Question 30

Inlet FOD protection

Answer 30

Inlet screens Vortex dissipator Partical seperators (helicotpers)

Question 31

Engine monitoring things

Answer 31

- EPR - Compressor and turbine speeds (RPM) - Torquemeter - turbine discharge pressure - EGT

Question 32

EPR indicates...

Answer 32

Indicates the amount of thrust the engine produces

Question 33

Turbine discharge pressure gage indicates..

Answer 33

Amount of pressure aft of last turbine stage

Question 34

Torque meter indicates

Answer 34

Amount of torque produced to drive prop or rotor

Question 35

EGT indicates

Answer 35

Temp at turbine section

Question 36

2 types of compressor cleaning

Answer 36

Fluid | Abrasive grit

Question 37

Compressor bleed air HP (jeppeson)

Answer 37

Cabin pressurisation, anti icing, pneumatic engine starting.

Question 38

Compressor stall caused by

Answer 38

Imbalance between inlet velocity and compressor rotational speed. When compressor blade AoA exceeds critical AoA

Question 39

Compressor mid band shrouds purpose

Answer 39

To make them more resistant to bending forces created by airstream

Question 40

Adv of centrifugal compressor

Answer 40

``` Simplicity Low cost Low weight Low starting power requirements Good operating efficiency ```

Question 41

Dis adv of axial flow compressors

Answer 41

``` High weight High starting power Low pressure rise per stage Expensive Difficult to manufacture ```

Question 42

Combustion section elements:

Answer 42

Combustion chamber Fuel injection sys Ignition sys Fuel drainage sys

Question 43

Purpose of swirl vanes

Answer 43

To slow air down so the flame can propagate properly. Fast airflow cuases flame outd

Question 44

Disadvantage of tailpipe

Answer 44

Reduces efficiency due to heat and duct friction losses