Power Points Flashcards by Karl .Visuals

Purpose of thrust reversals

Increase aircraft stopping power with a significant increase In weight

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Benefits of thrust reversals

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

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4 methods if thrust reversal

hot jet
cold jet
hot and cold jet
revrse pitch propellers

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2 types of operation thrust reversals

Mechanical
- clamshell
Areofynamic
- cascade vanes

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Thrust reversals safe guards

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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3 purposes of drive train system

Reduce speed
Increase torque
Provide drive for accessories

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Components mounted on accessory gearbox

starter motor
fuel pump
FCU
oil pump
generator
Tachometer generator

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Function of accessory gearbox

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

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Turbojet noise supressors

Corrugated

Lobe type nozzle

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How do turbo jet noise reduction nozzles work

Changes the jet pattern reducing noise level

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Modular alignment methods

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

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3 reasons for post maintenance activites

Prevent corrosion
Control deterioration
Eliminate physical damage

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Oil pressure system components

Tank
Pump
Filter
Relief valve
Oil jets

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Oil scavenge components

Strainer
Scavage pump
Oil cooler
Tank
Centrifugal breather

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Low pressure air uses [5]

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

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3 effects from icing

Decreased performance
FOD
Compressor surging/stalling

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3 methods of ice prevention

Hot air
Electric heating
Hot oil

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4 engine starting systems

Motor
Fuel sys
Ignition sys
Control sys

5 types of starters

Electric 
Air turbine
Air impingement 
Gast turbine starter
Cartridge type

Fire prevention methods [5]

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

Fire extinguishing components

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

Fire discharge indicators

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

What cascade vanes do

Redirect escaping exhaust gasses forward

Fuel flow measured in

Weight

Braking force of thrust reverses

Proved 20% braking force under normal conditions

How Turbo fans dampen noise

Insulating blankets/ absorbing material

Define ram effect

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

Second operation of air inlet

Provide uniform supply of air to the compressor

Shape of subsonic inlets and why

Divergent. Increase pressure and slow down velocity

Inlet FOD protection

Inlet screens Vortex dissipator Partical seperators (helicotpers)

Engine monitoring things

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

EPR indicates...

Indicates the amount of thrust the engine produces

Turbine discharge pressure gage indicates..

Amount of pressure aft of last turbine stage

Torque meter indicates

Amount of torque produced to drive prop or rotor

EGT indicates

Temp at turbine section

2 types of compressor cleaning

Fluid | Abrasive grit

Compressor bleed air HP (jeppeson)

Cabin pressurisation, anti icing, pneumatic engine starting.

Compressor stall caused by

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

Compressor mid band shrouds purpose

To make them more resistant to bending forces created by airstream

Adv of centrifugal compressor

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

Dis adv of axial flow compressors

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

Combustion section elements:

Combustion chamber Fuel injection sys Ignition sys Fuel drainage sys

Purpose of swirl vanes

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

Disadvantage of tailpipe

Reduces efficiency due to heat and duct friction losses