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Part 1 Materials > Book2 > Flashcards

Book2 Flashcards

1
Q

A cable that is 7 x 14? What’s it mean?

A

7 strands - 14 wires

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2
Q

How do I classify cables?

A

Minimum breaking load CWT

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3
Q

What is a lockclad cable

A

Aluminium tube swaged around it. It’s rigid. Thermal expansion is that to close to the structure. LESS CABLE SAG

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4
Q

What is the use of a turnbuckle?

A

Adjust tension of cables

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5
Q

After tension has been adjusted what needs to be checked?

A

If it’s in safety, lockwired, locknuts , NOT BUTTING

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6
Q

how to check if American turnbuckles are in safety

A

No more than 3 threads showing and fancy clip which is used once

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7
Q

How do Americanss know which side is left hand thread

A

A groove

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8
Q

British fork joints may be identified by a code marked on the shank. A grooved COLLAR indicates? A grooved SHANK INDICATES

A

HIGH TENSILE STEEL

HIGH TENSILE STAINLESS STEEL

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9
Q

Bracing wires are made from?

A

HIGH TENSILE STAINLESS STEEL ZINC OR CADMIUM PLATES

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10
Q

THE SIZE of the rod or tie is shown by a letter and number code stamped on the right hand threaded end.

E174 would indicate

A

E = 1/4 of inch
174 = 17.4inch long

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11
Q

Where would shackle pins be used?

A

With fork joints or fork ends

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12
Q

What type of loads do shackle pins take and what are they secured with?

A

SHEAR LOADS AND SPLIT PINS

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13
Q

What are shackle pins made from?

A

HIGH TENSILE STEEL (HTS) AND HIGH TENSILE STAINLESS STEEL (HTSS)

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14
Q

How are HIGH TENSILE STAINLESS STEEL SHACKLE PINS IDENTIFIED

A

By a dimple at the bottom and a Z on the head

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15
Q

How are shackle pins measured?

A

UNDERSIDE OF HEAD TO THE NEARER SODE OF THE SPLIT PIN HOLE

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16
Q

FAIR LEADS MUST NOT DEFLECT A CABLE BY MORE THAN?

A

3 degrees

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17
Q

What makes a pully

A

MICARTA TUFNOL AND A SEALED BEARING IN THE MIDDLE. CABLE GUARDS STOP THE CANLE COMING OFF PULLEY

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18
Q

Cable tension regulators are used to do what?

A

Take up the slack due to change in expansion

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19
Q

What is used to tension a un regulated system

A

TENSIOMETER

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20
Q

What type of operation does a Bowden control offer?

A

PULL and returns with tension spring

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21
Q

Compression springs are used?

A

Engine springs and non return valves

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22
Q

Bowden flex operation is

A

Push pull

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23
Q

THE RAILS IN THE BOWDEN FLEX DO WHAT?

A

OUTER GUIDE RAIL TAKES REACTION LOADS

CENTRE LOAD RAIL TAKES FULL LOAD

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24
Q

How do we identify the alignment of the centre load rail?

A

By flats

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25
Q

If the flats are horizontal, the Bowden flex will operate?

A

Up or down (vertically) and vice versa

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26
Q

Where would a Bowden flex control
Cable be found?

A

Engine control where inching is required

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27
Q

What is a teleflex cable?

A

Helical wire inside a conduit and engages with a gear to turn a shaft

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28
Q

What is the maximum bend on a teleflex cables

A

4 inch

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29
Q

What is the maximum wrap round on a single entry box unit

A

40 degrees

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30
Q

What is the disadvantage of a straight lead unit?

A

Can’t take high loads

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31
Q

Hydraulic pipes used to be made off copper, what are they made off now?

A

Tungum stainless steel titanium

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32
Q

Junction box units are installed where it’s nexcasery?

A

To reverse the direction of travel

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33
Q

Can we repair a rigid pipe?

A

No unless specified

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34
Q

What is the coupling called where the nipple is permanently fixed?

A

Brazed nipple silver solderd

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35
Q

What is the flare angle of an AGS PIPE?

A

32 degrees

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36
Q

Low pressure couplings use what to seal?

A

O rings and usually used for air and vapour lines

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37
Q

Complete couplings have?

A

No nipple

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38
Q

Advantage of a flare less coupling?

A

No metal fatigue. Flaring leaves the tube end in a stressed condition

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39
Q

How is a flare less coupling assembled?

A

Fitting screwed on until finger tight, then nut is turned a full turn with a spanner

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40
Q

AN couplings have a flare angle off?

A

74 degrees

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41
Q

What test is done after forming a flare less coupling?

A

Make sure the sleeve does not move backwards and forwards but can rotate

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42
Q

Advantage of self sealing coupling?

A

Not needed to be bleeded

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43
Q

Inverted u bends?

A

Must not be used. Will cause vapour locks

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44
Q

Sliding coupling uses what seal?

A

O rings

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45
Q

Sliding couplings are used for?

A

Where only air and vapour passes. Needs to be bonded. They may also be enclosed in drip shields or heat shields

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46
Q

V band clamps and couplings are used where and sealed how?

A

V band clamps are used in high temperature, high pressure environments. And sealed with metal gaskets

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47
Q

Tightening hose clips too tight can cause what?

A

Cold flow

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48
Q

What must we make sure off when using hoses?

A

The hose must be compatible with the system fluid

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49
Q

Corbin hose clamps are made from?

A

SPRING STEEL WIRE

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50
Q

Flexible pipes are made from?

A

Synthetic rubber or Teflon

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51
Q

Teflon hoses are made from what?

A

PTFE AND IS CHEMICALLY INTERT

52
Q

Hoses which are located in a fire zone are required to be?

A

FIRE PROOF

53
Q

How are the length of hose assemblies measured?

A

With straight end fittings, they are measured from the nipple extremities.

In the case of elbowed fittings, length is taken from the centre of the bore

54
Q

What do coloured stripes on a hose indicate?

A

It denotes the number of layers of wire braiding in its construction

55
Q

How are bearings classified?

A

By type of rolling element

56
Q

Roller bearings use?

A

CST: CYLINDRICAL SPHERICAL AND TAPERED ROLLER BEARINGS IN ROTARY OR OSCILLATORY CONDITIONS

57
Q

Ball bearings and tapered roller bearings can carry what loads?

A

Radial and axial loads

58
Q

Other bearing types usually carry what?

A

Carry mainly radial loads

59
Q

Bearings are made from what?

A

Low carbon steel containing nickel molybdenum and chromium.

60
Q

Caged bearings are used where?

A

Engine applications or high speed areas

61
Q

Ball bearings are divided into 4 main groups. What are they?

A

RADIAL
ANGULAR
THRUST
PRECISION

62
Q

Crowded ball races are used only where?

A

Crowded ball races are used where slow rotation or oscillating movement is required

63
Q

Angular contact bearings accept what loads?

A

Radial and axial in one direction

64
Q

Thrust bearings carry what loads?

A

Axial loads. And heavy loads at low speeds

65
Q

Roller bearings may be divided into three main groups which are

A

CST - cylindrical, spherical and tapered rollers

66
Q

Needle roller bearings are designed for what loads? And what movement

A

Radial loads where movement is oscillatory

67
Q

Cylindrical roller bearings carry?

A

Greater radial loads than smilies size ball bearings

68
Q

Tapered roller bearings accept?

A

Simultaneos radial and axial loads in one direction

69
Q

In a tapered roller bearing the cup is located?

A

On the outside and the inside is the cone

70
Q

Plain bearings are made from?

A

Sintered bronze

71
Q

A type of damage occurs on needle roller bearings because they don’t rotate as well what is it?

A

Brinelling

72
Q

What is the point of bearing pre load?

A

Rigid bearing metal
To metal contact

73
Q

Springs behave?

A

Elastically under load

74
Q

Springs are made from?

A

Piano wire which is a high carbon steel

Also made by either a hot or cold working process

75
Q

Protective coatings for springs can withstand temps of up to?

A

250 degrees and made from plastic zinc nickel chromium or tin

76
Q

Extension springs have what to prevent over stressing

A

Mechanical stops

77
Q

What do we know about piston engine valve springs

A

Unevenly spaced and Progressive rate springs

78
Q

Conical compression springs replace cylindrical compression springs when

A

the space in the axial direction is limited

79
Q

What is spring rate?

A

Spring rate of a spring is the load required to produce a unit of deflection

80
Q

Compression springs are used where?

A

Flow control valves in engine and airframe systems

81
Q

Conical helical compression springs are used?

A

In ball type non return valves in hydraulic components

82
Q

Tensions springs are used?

A

As return springs in remote control systems and as elevator down springs

83
Q

Spiral springs are used where?

A

Used in instruments to eliminate, lost motion or backlash in gear trains

84
Q

Cylindrical helical torsion springs are used where?

A

Crew seats and escape
Hatches

85
Q

Leafy springs used where?

A

Light a/c 1/4inch eliptocal tailwheel
Shock absorbers

86
Q

What are gears?

A

Toothed wheels to transmit power between components

87
Q

Smaller gear is called what?

A

Pinion

88
Q

If the gear drives the pinion,. What does this mean?

A

Speed increaser

89
Q

If the pinion drives the gear what does this mean?

A

Speed reducer

90
Q

When one gear drives another they turn?

A

In opposite directions

91
Q

If it is required that they both turn in the same direction what is used?

A

An idler gear

92
Q

What is the name of the tooth above the pitch circle

A

Addendum

93
Q

What is the name of the tooth inside the pitch circle

A

Dedendum

94
Q

Why is the involute curve found to be the best?

A

Because it transmits power most effectively

95
Q

The onvloute curve is the

A

Shape of the tooth

96
Q

What is backlash?

A

The play between the teeth

97
Q

If the teeth of one gear is set too tightly to the teeth of another? There will be no?

A

Backlash

98
Q

What does this result in?

A

Gears not being lubricated properly and overheating of gears

99
Q

How is backlash measured?

A

DIAL TEST INDICATOR DTI AND FLAG

100
Q

What is the hunting tooth used for?

A

To reduce wear

101
Q

In gears wear can further be reduced how?

A

By making the pinion harder

102
Q

What do we know about the axis on hypoid gear?

A

That they will never meet

103
Q

Spur gears transmit power between?

A

2 parallel shafts

104
Q

Helical gears can transmit power?

A

Between shafts at any angle to each other

105
Q

Helical gears are more expensive than spur gears and are normally used for

A

High speed operation and high load applications

106
Q

Helical gears are most commonly found in

A

Parallel shaft drives

107
Q

Bevel gears are shaped how?

A

Like sections of cones

108
Q

Bevel gears are used to transmit power between

A

Non parallel shafts whose axis intersect

109
Q

When axis don’t intersect the gear is known as a what?

A

Hypoid gear

110
Q

Hypoid gears require what?

A

To be lubricated with an oil containing a extreme pressure additive

111
Q

Conformal gears are used where?

A

In helicopter gear boxes

112
Q

What is the advantage of conformal mesh?

A

That there is a area of contact between the teeth of the meshing gears

113
Q

How is gear ratio worked out

A

Driven over driver

114
Q

Does the idler affect the over all velocity ratio?

A

No, not at all

115
Q

What is the advantage of a compound gear train?

A

That it can produce a high gear ratio without the disproportionate gear sizes

116
Q

Epicyclic reduction gears are used where?

A

Reduction gear assemblies of turbo prop engines and helicopter gear boxes

117
Q

Each tooth of a bevelled gesr has a

A

Heel and a toe

118
Q

The patterns of gears taken by using what?

A

A Prussian blue to leave an imprint on the gear teeth

119
Q

Advantage of a toothed belt over a v belt

A

Toothed belt won’t slip

Doesn’t need pretensioning

120
Q

V belts can be?

A

Crossed to reverse the direction of rotation

121
Q

Belts have limitations such as

A

They apply a radial load on the pulley bearing when tightened

Prone to slip

Bulky when transmitting high powers

122
Q

Chains are used for what?

A

Used to convert rotary motion to linear motion where considerable force is required to be transmitted

123
Q

Incorrect assembly of chains is prevented by?

A

The use of non reversible chains in conjunction with the approprte wheels guards and connectors

124
Q

Change of direction of a straight line motion in 2 planes is achieved by using?

A

A bi planer block

125
Q

What is the principal dimensions of a chain

A

Pitch
Width between inner plates
Roller diameter

Part 1 Materials (4 decks)

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