Lewis Revision Cards Flashcards by Meg Bazeley

What’s used to attach to fabric to wood

Dope

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What’s the issue with dope

It’s very flammable

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What’s added to dope to protect it from UV degradation

Aluminium

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What’s type of fabric is used for aircraft

Polyester and glass fibre

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What are the 3 inspection pannels

Spring, wood frames and zip

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What are the two tools used to test the tension on fabrics? What ones better

Seyboth and maul.
Maul is better as it doesn’t puncture a hole in it

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What type of repair is used for straight edge tears in fabrics

Herringbone stitches

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What locking device can be reused

Shake proof washers

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What are the most common materials used in locking wire

Copper and stainless steel

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What’s the most common type of 1/4 turn fasteners

Dzus

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What’s the difference between heavy and light duty Dzus fasteners

Heavy requires a grommet

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If a internal wrenching bolt is installed in aluminium what must be considered and why

Placing a washer under the head must be considered to spread the pressure that’s being exerted onto the surface

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At what temperature do low temp self locking nuts operate

Below 121 degrees

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What’s the difference between AN and AC fittings

AN
Longer
Blue or black
Course thread

AC
Shorter
Grey
Finer thread

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Which fitting ( AN or AC ) has recess

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What does the D mean marked on a hydraulic fitting

Made from aluminium

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What does the S mean marked in a hydraulic fitting

That it’s made from CRES

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When are permaswage repairs done

In quick in situ repairs

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What do lay lines indicate on hose

Indicates any twisting

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What’s the most common material used for inside of tubing and why

Teflon because it’s chemically compatible with most fluids

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What’s the low pressure, medium pressure and high pressure of hose

Low- 600
Medium- up to 3000psi
High- over 3000psi

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When wouldpotted repairs used for

Holes up to 2.5cms

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What’s the issue with radiography

They can’t detect delaminations

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What’s the carbon percentage In
Low carbon steel
Medium carbon steel
And high carbon steel

0.1-0.3
0.3-0.5
0.5-1.05

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What class a screws usually

What are the 3 general grades of stainless steel

Austenitic Ferritic Martensitic

What is an AN426

Countersunk head rivet

What’s a AN470

Universal head rivet

Why are countersunk rivets more commonly used on aircraft surfaces

Aerodynamics

What does 3xxx

Manganese

What’s 5xxx

What’s 4xxx

Silicon

What are the two common nickel alloys

Morel and inconel

What is the reducing agent in corrosion

Anode

What’s the most common rivet type used

2117

Two types of fibreglass

E and s glass

What’s fibreglass made up from

Silica glass

What’s aramid repaired with

Fibreglass

Why isn’t boron commonly used on aircraft

Because it’s very expensive and can be dangerous

Where’s ceramic used

In high temperatures

What’s the negative of pre impregnated fabrics

Must be frozen

What’s the major diameter and minor diameter on a male thread

Major - crest to crest Minor- root to root

What’s the major and minor diameter in a female thread

Major is root to root Minor is crest to crest

What’s the thread angle of British thread forms, what ones the anomaly and what’s the degrees of that

55 degrees Ba anomaly and angle of 47.5

What’s the thread angle of American thread forms

What’s the thread angle of unified thread forms

What does the x mean on the top of a bolt head

That it’s a steel bolt

What does the dash on top of a bolt head mean

That it’s made of a CRES

What does the triangle mean on top of a bolt

Shows it’s a close tolerance bolt

What does the double dashes on a bolt head mean

That it’s made from aluminium

When are stepped studs used

In softer materials

What’s the diameter of rivets measured in

1/32 of an inch

What’s the length of the rivet measured in

1/16th

How’s a 1100 rivet identified

No marking With letter A (absent)

How’s a 2117 rivet identified

Letters AD A dimple

What’s a 5056 rivet identified by

The letter B Has a cross on it

How’s a 2017 rivet identified

A dot Identified with a D

How’s a 2024 rivet identified

DD Double dash

What’s the economic advantage of cherry max rivets over cherry locks

Cherry max require one size puller

What type of metals are more succesptible to exfoliation

Wrought

What’s the difference between a high lock and a high lite fastner

High lite are lighter

What does PHDAN stand for

Physically dangerous

Where is magnesium used in aircraft

Landing gear/wheels

For rigid fluid lines what’s classified as High pressure Medium Low

High is over 1500 Medium is below 1500 Low is suction and return

How’s tubing size determined

By outside diameter in 1/8ths of an inch

Where’s aluminium obtained from

Bauxite ore

What’s the flair angle of an AN fitting

37 degrees

What’s the flare angle of AC fittings

35 degrees

How are flareless fittings sealed

Ball and bush principle

What are the two forces bearings are subjected to

Axial and radial

What’s the issue of using ball bearings

They can only withstand light radial loads

What does F, O and H stand for

Fabricated, annealed and strain hardened

What two materials are used in cables

Aluminium and copper

What happens to the ability of cables to carry a current when there enclose with other cables

They can’t carry as much current due to it will produce heat

What are thermocouples made from

Chrome land alumel

When are bevel gears used

When a drive needs to be transmitted to a different axis

Where are planetary gears used in aircraft

As reduction gearing in aircraft engines

Benefits of using a roller bearing over a ball bearing

Roller will take more radial loads due to larger contact area

What are the +’s of synchronous belts

Low maintenance Non slip Non lubricated

Which of the following cables are flexible and which are non flexible 1x7 1x19 7x7 7x19

1x7 non flexible 1x19 non flexible 7x7 flexible 7x19 flexible

Benefits of using lock clad cable

Prevents sag Prevents vibration

What’s the role of a cable turnbuckle

Facilitates cable tensioning

What’s the use of fairleads

Prevents the wire from coming in contact with the structure

If a turnbuckle had a groove on it what does that indicate

That it’s a left hand thread

What’s the advantage of a helical gear over a spur gear

They’re quieter and can carry heavier loads

Advantages of multiple pulley drives

Allow change in speed