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Maintenance Practices > Fits And Clearances > Flashcards

Fits And Clearances Flashcards

1
Q

What is a Fit?

A

How tight or loose two joined parts fit together

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2
Q

What is a shaft?

A

A rounded part that fits into a bore including pegs, axles, bolts, pins, etc

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3
Q

What is Nominal Size?

A

Measurement calculated in the draft also a dimension

Idea, dimension

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4
Q

What is a tolerance?

A

A deviation from the Nominal size

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5
Q

What is a Clearance fit?

A

There will always be some play between the two assembled items when joined

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6
Q

What is a Transition fit?

A

There can be some play between two assembled items or interference depending on their Nominal sizes

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7
Q

What is an Interference fit?

A

The hole is always smaller than the shaft and will require force to fit together

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8
Q

What is the difference between a Hole Based system and a Shaft Based system?

A

Capital letters indicate Hole deviations
Lowercase letters indicate Shaft deviations

Hole Based - the minimum hole size is the basic size
Shaft Based - the maximum shaft size is the basic size

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9
Q

What is a Dial Tester?

A

Precision instrument for measuring movement between parts

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10
Q

What process is used to harden solid rivets soon after solution heat treatment?

A

Age hardening

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11
Q

What angle countersinks are available and which is most common?

A

82 degrees
100 degrees
120 degrees

Most common is 100 degrees

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12
Q

Which rivets require heat treatment?

How many times can they be treated?

A

D
DD
E

Once

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13
Q

What does AN470DD-5-6 indicate?

A

Universal head
2024 alloy
5/32 diameter
6/16 length

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14
Q

What is the centre to centre distance of two fasteners in a single row called?

A

Pitch

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15
Q

What is Sphere of Influence?

A

The area of sheet metal over which a rivet will achieve a water-tight joint

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16
Q

How is inter-buckling prevented?

A

The maximum permissible rivet spacing of a pressurised fuselage should be 6D or 18t (whichever is smaller)

17
Q

Why would you need to dimple material?

A

Skin is too thin to cut - countersink is shaped (dented) to accept the head of a countersunk fastener by dimpling

18
Q

Which dimpling process is best used for limited access?

A

Radius dimpling greater than 100 degrees so cannot nest, dies smaller than radius for getting into hard to reach areas

19
Q

What refinement to the dimpling process prevents cracking of hard material?

A

Hot dimpling for 7075

Same as coin

20
Q

Which dimpling process provides sharply defined edges?

A

Coin dimpling

21
Q

What tool is required for reaction riveting?

A

Rivet gun

22
Q

What is the meaning of the term percussion riveting?

A

Hand riveting

23
Q

What method is preferred for installation of solid fasteners?

A

Squeeze followed by pneumatic

24
Q

What tool is required for squeeze riveting?

A

Squeeze tool

25
Q

What tool is required for percussion riveting?

A

Hammer

Dolly

26
Q

What must be taken into account before countersinking material?

A

Added thickness due to tape or protective coating

27
Q

How is depth adjusted on a microstop countersinker?

A

Pulling sleeve back and turning the stop to increase or decrease the cut. Sleeve is then dropped back into its original position

28
Q

Where can general requirements of riveting a particular aircraft be found?

A

SRM

29
Q

How is a solid rivet removed without damaging the structure?

A 
Centre punch head for drill 
Drill into head 
Position punch 
Snap off head 
Push out
30
Q

What system is used to protect hose assemblies from chafing and temperature extremes?

A

Sleeve:
Heat shrink
Nylon spiral wrap
Teflon

31
Q

What is the usual corrective/repair action for springs found to be unserviceable?

A

Replaced

32
Q

What law of physics pertains to the behaviour of springs and what does it state?

A

Hooke’s Law

Within its elastic limit it is said to obey Hooke’s Law

Maintenance Practices (7 decks)

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