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EGK Systems > AC Systems > Flashcards

AC Systems Flashcards

1
Q

CS For Airworthiness

A

CS23 - Small Commuter AC
CS25 - Large Turbine AC 5300kg

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2
Q

Safe Life

A

To not suffer catastrophic failure in AC expected life cycle
If it does fail there will be no catastrophic damage

Flying hour/Cycles/TO/LD/Pressurisations

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3
Q

Fail Safe

A

Redundancy alternate component for the load path

+ Backup for critical component
- Costs/POF/Weight

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4
Q

Damage Tolerance Structure

A

Spreading Load over larger area
Crack arresting features limit spread of cracks
+ eliminates extra structure

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5
Q

CS Standards Focus Points?

A

Design
Build Materials
Build Quality
Manufacturing standards

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6
Q

Stress

A

Internal force per unit inside component from external loading (press or stress)

  • distorting in skin
  • missing rivets
  • wrinkles
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7
Q

Strain

A

Deformation caused by stress

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8
Q

Types of stress

A
  • tension (apart)
  • compression (together)
  • torsion (twisting)
  • sheer (parallel)
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9
Q

Wing in flight

A

Compression on top of wing
Tension under wing

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10
Q

Excessive compression & tension

A

Compression - buckling/wrinkling
Tension - pulled rivets

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11
Q

Dynamic load

A

Quick build up due to flight conditions
Manoeuvring and change in g load.
Severe

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12
Q

Static Load

A

Constant/slow build up
Weight of wheel on ground on ac wings

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13
Q

Bending Load + relief?

A

Greatest at wing roots
Weight + dynamic forces by lift

Weight management
Staying within loading g limit
MZFM limit keep wing root within limits
Load alleviation - rigid

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14
Q

Cyclic Loads

A

Alternating loads at difference phases of flight

Pressurisation

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15
Q

Design limit + design ultimate load

A

Max load set by designer in service

DLL x 1.5

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16
Q

Wing Spars

A

Main structural loading
Withstand torsional/bending loads

17
Q

Fatigue

A

Failure at a load less than steady applied load.

  • weight
  • size of loads
  • tensions loading

F LIFE - # cycles for metal to fail at certain stress

18
Q

Corrosion

A

Disintegration of metals
Oxidation
Electrolytic - dissimilar metals EP contrast

Black oil from rivets = corrosion

19
Q

Stress Corrosion

A

Fatigue + corrosion

Corrosive conditions under tensile loads

20
Q

Delamination

A

Decrease in composite structure strength

  • difficult to detect
  • bubbled skin
  • hair line cracks
  • changes in sound when tapping
21
Q

Hard time

A

Removed at intervals
Serial numbers/Part Numbers
Scheduled maintenance

22
Q

On-Condition

A

Inspected and monitored
Removed in fails visual inspection

23
Q

Composite

A

Two or more materials to give rise to unique structural properties

Matrix - epoxies/polyester
Fibres - glass/carbon/armaid

Matrix spread load between fibres

24
Q

Advantage/disadvantage of composite

A

Retain properties at elevated temps
High strength
Stiffness

Costly
Labour intensive
Hard to maintain
Careful electrical bonding required
Delamination

25
Q

Composite Core

A

Replaces heavier matrix in some structures

Ideal for:
- thermal acoustic insulation
- high stiffness and strength

Issue:
- water can penetrate

Flight controls
Sound proofing engines

26
Q

Prepeg Tow

A

Composite method laying fibre onto of the mould - preferred method

27
Q

Ratio of the change in size of deformed structure to the non deformed structure is…

A

Strain

28
Q

Mercury/Potassium Hydroxide

A

Produce toxic fumes and rapid corrosion of ac structure

29
Q

Visual indicator of corrosion

A

White spots on bare aluminium surfaces

30
Q

Certification Specifications

A

Lays down basic requirements for design,material quality, build quality and behavioural characteristics

31
Q

Rate of corrosion is increased by

A

Temperature
Humidity
Rainfall
Sulfur dioxide
Air salinity

32
Q

Indication of corrosion on aluminium

A

White/grey powder

33
Q

Corrosion of iron

A

Red/brown streaks

34
Q

Metals in combination with saltwater

A

Yellowish colour

EGK Systems (15 decks)

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