Book2 Flashcards
(125 cards)
1
Q
A cable that is 7 x 14? What’s it mean?
A
7 strands - 14 wires
2
Q
How do I classify cables?
A
Minimum breaking load CWT
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
4
Q
What is the use of a turnbuckle?
A
Adjust tension of cables
5
Q
After tension has been adjusted what needs to be checked?
A
If it’s in safety, lockwired, locknuts , NOT BUTTING
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
7
Q
How do Americanss know which side is left hand thread
A
A groove
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
9
Q
Bracing wires are made from?
A
HIGH TENSILE STAINLESS STEEL ZINC OR CADMIUM PLATES
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
11
Q
Where would shackle pins be used?
A
With fork joints or fork ends
12
Q
What type of loads do shackle pins take and what are they secured with?
A
SHEAR LOADS AND SPLIT PINS
13
Q
What are shackle pins made from?
A
HIGH TENSILE STEEL (HTS) AND HIGH TENSILE STAINLESS STEEL (HTSS)
14
Q
How are HIGH TENSILE STAINLESS STEEL SHACKLE PINS IDENTIFIED
A
By a dimple at the bottom and a Z on the head
15
Q
How are shackle pins measured?
A
UNDERSIDE OF HEAD TO THE NEARER SODE OF THE SPLIT PIN HOLE
16
Q
FAIR LEADS MUST NOT DEFLECT A CABLE BY MORE THAN?
A
3 degrees
17
Q
What makes a pully
A
MICARTA TUFNOL AND A SEALED BEARING IN THE MIDDLE. CABLE GUARDS STOP THE CANLE COMING OFF PULLEY
18
Q
Cable tension regulators are used to do what?
A
Take up the slack due to change in expansion
19
Q
What is used to tension a un regulated system
A
TENSIOMETER
20
Q
What type of operation does a Bowden control offer?
A
PULL and returns with tension spring
21
Q
Compression springs are used?
A
Engine springs and non return valves
22
Q
Bowden flex operation is
A
Push pull
23
Q
THE RAILS IN THE BOWDEN FLEX DO WHAT?
A
OUTER GUIDE RAIL TAKES REACTION LOADS
CENTRE LOAD RAIL TAKES FULL LOAD
24
Q
How do we identify the alignment of the centre load rail?
A
By flats
25
If the flats are horizontal, the Bowden flex will operate?
Up or down (vertically) and vice versa
26
Where would a Bowden flex control
Cable be found?
Engine control where inching is required
27
What is a teleflex cable?
Helical wire inside a conduit and engages with a gear to turn a shaft
28
What is the maximum bend on a teleflex cables
4 inch
29
What is the maximum wrap round on a single entry box unit
40 degrees
30
What is the disadvantage of a straight lead unit?
Can’t take high loads
31
Hydraulic pipes used to be made off copper, what are they made off now?
Tungum stainless steel titanium
32
Junction box units are installed where it’s nexcasery?
To reverse the direction of travel
33
Can we repair a rigid pipe?
No unless specified
34
What is the coupling called where the nipple is permanently fixed?
Brazed nipple silver solderd
35
What is the flare angle of an AGS PIPE?
32 degrees
36
Low pressure couplings use what to seal?
O rings and usually used for air and vapour lines
37
Complete couplings have?
No nipple
38
Advantage of a flare less coupling?
No metal fatigue. Flaring leaves the tube end in a stressed condition
39
How is a flare less coupling assembled?
Fitting screwed on until finger tight, then nut is turned a full turn with a spanner
40
AN couplings have a flare angle off?
74 degrees
41
What test is done after forming a flare less coupling?
Make sure the sleeve does not move backwards and forwards but can rotate
42
Advantage of self sealing coupling?
Not needed to be bleeded
43
Inverted u bends?
Must not be used. Will cause vapour locks
44
Sliding coupling uses what seal?
O rings
45
Sliding couplings are used for?
Where only air and vapour passes. Needs to be bonded. They may also be enclosed in drip shields or heat shields
46
V band clamps and couplings are used where and sealed how?
V band clamps are used in high temperature, high pressure environments. And sealed with metal gaskets
47
Tightening hose clips too tight can cause what?
Cold flow
48
What must we make sure off when using hoses?
The hose must be compatible with the system fluid
49
Corbin hose clamps are made from?
SPRING STEEL WIRE
50
Flexible pipes are made from?
Synthetic rubber or Teflon
51
Teflon hoses are made from what?
PTFE AND IS CHEMICALLY INTERT
52
Hoses which are located in a fire zone are required to be?
FIRE PROOF
53
How are the length of hose assemblies measured?
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
What do coloured stripes on a hose indicate?
It denotes the number of layers of wire braiding in its construction
55
How are bearings classified?
By type of rolling element
56
Roller bearings use?
CST: CYLINDRICAL SPHERICAL AND TAPERED ROLLER BEARINGS IN ROTARY OR OSCILLATORY CONDITIONS
57
Ball bearings and tapered roller bearings can carry what loads?
Radial and axial loads
58
Other bearing types usually carry what?
Carry mainly radial loads
59
Bearings are made from what?
Low carbon steel containing nickel molybdenum and chromium.
60
Caged bearings are used where?
Engine applications or high speed areas
61
Ball bearings are divided into 4 main groups. What are they?
RADIAL
ANGULAR
THRUST
PRECISION
62
Crowded ball races are used only where?
Crowded ball races are used where slow rotation or oscillating movement is required
63
Angular contact bearings accept what loads?
Radial and axial in one direction
64
Thrust bearings carry what loads?
Axial loads. And heavy loads at low speeds
65
Roller bearings may be divided into three main groups which are
CST - cylindrical, spherical and tapered rollers
66
Needle roller bearings are designed for what loads? And what movement
Radial loads where movement is oscillatory
67
Cylindrical roller bearings carry?
Greater radial loads than smilies size ball bearings
68
Tapered roller bearings accept?
Simultaneos radial and axial loads in one direction
69
In a tapered roller bearing the cup is located?
On the outside and the inside is the cone
70
Plain bearings are made from?
Sintered bronze
71
A type of damage occurs on needle roller bearings because they don’t rotate as well what is it?
Brinelling
72
What is the point of bearing pre load?
Rigid bearing metal
To metal contact
73
Springs behave?
Elastically under load
74
Springs are made from?
Piano wire which is a high carbon steel
Also made by either a hot or cold working process
75
Protective coatings for springs can withstand temps of up to?
250 degrees and made from plastic zinc nickel chromium or tin
76
Extension springs have what to prevent over stressing
Mechanical stops
77
What do we know about piston engine valve springs
Unevenly spaced and Progressive rate springs
78
Conical compression springs replace cylindrical compression springs when
the space in the axial direction is limited
79
What is spring rate?
Spring rate of a spring is the load required to produce a unit of deflection
80
Compression springs are used where?
Flow control valves in engine and airframe systems
81
Conical helical compression springs are used?
In ball type non return valves in hydraulic components
82
Tensions springs are used?
As return springs in remote control systems and as elevator down springs
83
Spiral springs are used where?
Used in instruments to eliminate, lost motion or backlash in gear trains
84
Cylindrical helical torsion springs are used where?
Crew seats and escape
Hatches
85
Leafy springs used where?
Light a/c 1/4inch eliptocal tailwheel
Shock absorbers
86
What are gears?
Toothed wheels to transmit power between components
87
Smaller gear is called what?
Pinion
88
If the gear drives the pinion,. What does this mean?
Speed increaser
89
If the pinion drives the gear what does this mean?
Speed reducer
90
When one gear drives another they turn?
In opposite directions
91
If it is required that they both turn in the same direction what is used?
An idler gear
92
What is the name of the tooth above the pitch circle
Addendum
93
What is the name of the tooth inside the pitch circle
Dedendum
94
Why is the involute curve found to be the best?
Because it transmits power most effectively
95
The onvloute curve is the
Shape of the tooth
96
What is backlash?
The play between the teeth
97
If the teeth of one gear is set too tightly to the teeth of another? There will be no?
Backlash
98
What does this result in?
Gears not being lubricated properly and overheating of gears
99
How is backlash measured?
DIAL TEST INDICATOR DTI AND FLAG
100
What is the hunting tooth used for?
To reduce wear
101
In gears wear can further be reduced how?
By making the pinion harder
102
What do we know about the axis on hypoid gear?
That they will never meet
103
Spur gears transmit power between?
2 parallel shafts
104
Helical gears can transmit power?
Between shafts at any angle to each other
105
Helical gears are more expensive than spur gears and are normally used for
High speed operation and high load applications
106
Helical gears are most commonly found in
Parallel shaft drives
107
Bevel gears are shaped how?
Like sections of cones
108
Bevel gears are used to transmit power between
Non parallel shafts whose axis intersect
109
When axis don’t intersect the gear is known as a what?
Hypoid gear
110
Hypoid gears require what?
To be lubricated with an oil containing a extreme pressure additive
111
Conformal gears are used where?
In helicopter gear boxes
112
What is the advantage of conformal mesh?
That there is a area of contact between the teeth of the meshing gears
113
How is gear ratio worked out
Driven over driver
114
Does the idler affect the over all velocity ratio?
No, not at all
115
What is the advantage of a compound gear train?
That it can produce a high gear ratio without the disproportionate gear sizes
116
Epicyclic reduction gears are used where?
Reduction gear assemblies of turbo prop engines and helicopter gear boxes
117
Each tooth of a bevelled gesr has a
Heel and a toe
118
The patterns of gears taken by using what?
A Prussian blue to leave an imprint on the gear teeth
119
Advantage of a toothed belt over a v belt
Toothed belt won’t slip
Doesn’t need pretensioning
120
V belts can be?
Crossed to reverse the direction of rotation
121
Belts have limitations such as
They apply a radial load on the pulley bearing when tightened
Prone to slip
Bulky when transmitting high powers
122
Chains are used for what?
Used to convert rotary motion to linear motion where considerable force is required to be transmitted
123
Incorrect assembly of chains is prevented by?
The use of non reversible chains in conjunction with the approprte wheels guards and connectors
124
Change of direction of a straight line motion in 2 planes is achieved by using?
A bi planer block
125
What is the principal dimensions of a chain
Pitch
Width between inner plates
Roller diameter
