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GTE > Power Points > Flashcards

Power Points Flashcards

1
Q

Purpose of thrust reversals

A

Increase aircraft stopping power with a significant increase In weight

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2
Q

Benefits of thrust reversals

A
  • Aid in braking and directional control during landing
  • Back aircraft out of parking spots
  • aid in emergency landing and takeoffs
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3
Q

4 methods if thrust reversal

A
  • hot jet
  • cold jet
  • hot and cold jet
  • revrse pitch propellers
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4
Q

2 types of operation thrust reversals

A

Mechanical
- clamshell
Areofynamic
- cascade vanes

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5
Q

Thrust reversals safe guards

A
  • 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
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6
Q

3 purposes of drive train system

A

Reduce speed
Increase torque
Provide drive for accessories

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7
Q

Components mounted on accessory gearbox

A
  • starter motor
  • fuel pump
  • FCU
  • oil pump
  • generator
  • Tachometer generator
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8
Q

Function of accessory gearbox

A

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

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9
Q

Turbojet noise supressors

A

Corrugated

Lobe type nozzle

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10
Q

How do turbo jet noise reduction nozzles work

A

Changes the jet pattern reducing noise level

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11
Q

Modular alignment methods

A
  • spline drive
  • serrated drive
  • keys and keyway
  • off set bolt holes
  • dowels
  • witness marks
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12
Q

3 reasons for post maintenance activites

A

Prevent corrosion
Control deterioration
Eliminate physical damage

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13
Q

Oil pressure system components

A 
Tank
Pump
Filter
Relief valve
Oil jets
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14
Q

Oil scavenge components

A 
Strainer
Scavage pump
Oil cooler
Tank
Centrifugal breather
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15
Q

Low pressure air uses [5]

A

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

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16
Q

3 effects from icing

A

Decreased performance
FOD
Compressor surging/stalling

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17
Q

3 methods of ice prevention

A

Hot air
Electric heating
Hot oil

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18
Q

4 engine starting systems

A

Motor
Fuel sys
Ignition sys
Control sys

19
Q

5 types of starters

A 
Electric 
Air turbine
Air impingement 
Gast turbine starter
Cartridge type
20
Q

Fire prevention methods [5]

A 
Fire zones
Fire resistant materials
Explosion proof electrical equipment 
Drainage for leaks
External cooling and vents
21
Q

Fire extinguishing components

A 
Discharge handle/buttons
Fire bottles 
Explosive cartridges 
Discharge nozzles 
Discharge indicators
22
Q

Fire discharge indicators

A

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

23
Q

What cascade vanes do

A

Redirect escaping exhaust gasses forward

24
Q

Fuel flow measured in

A

Weight

25
Q

Braking force of thrust reverses

A

Proved 20% braking force under normal conditions

26
Q

How Turbo fans dampen noise

A

Insulating blankets/ absorbing material

27
Q

Define ram effect

A

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

28
Q

Second operation of air inlet

A

Provide uniform supply of air to the compressor

29
Q

Shape of subsonic inlets and why

A

Divergent. Increase pressure and slow down velocity

30
Q

Inlet FOD protection

A

Inlet screens
Vortex dissipator

Partical seperators (helicotpers)

31
Q

Engine monitoring things

A
  • EPR
  • Compressor and turbine speeds (RPM)
  • Torquemeter
  • turbine discharge pressure
  • EGT
32
Q

EPR indicates…

A

Indicates the amount of thrust the engine produces

33
Q

Turbine discharge pressure gage indicates..

A

Amount of pressure aft of last turbine stage

34
Q

Torque meter indicates

A

Amount of torque produced to drive prop or rotor

35
Q

EGT indicates

A

Temp at turbine section

36
Q

2 types of compressor cleaning

A

Fluid

Abrasive grit

37
Q

Compressor bleed air HP (jeppeson)

A

Cabin pressurisation, anti icing, pneumatic engine starting.

38
Q

Compressor stall caused by

A

Imbalance between inlet velocity and compressor rotational speed.

When compressor blade AoA exceeds critical AoA

39
Q

Compressor mid band shrouds purpose

A

To make them more resistant to bending forces created by airstream

40
Q

Adv of centrifugal compressor

A 
Simplicity
Low cost
Low weight
Low starting power requirements
Good operating efficiency
41
Q

Dis adv of axial flow compressors

A 
High weight 
High starting power
Low pressure rise per stage
Expensive
Difficult to manufacture
42
Q

Combustion section elements:

A

Combustion chamber
Fuel injection sys
Ignition sys
Fuel drainage sys

43
Q

Purpose of swirl vanes

A

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

44
Q

Disadvantage of tailpipe

A

Reduces efficiency due to heat and duct friction losses

GTE (5 decks)

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