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AT 202 > Exam 2 > Flashcards

Exam 2 Flashcards

1
Q

advantages of split bus system

A

one entire bus can fail with other systems operating normally

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2
Q

starter generator

A

one unit
direct drive (saves weight, less complex)

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3
Q

parallel generators advantages

A

safer
more power
generators carry load equally

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4
Q

parallel generator disadvantage

A

unable to maintain full output at low rpm

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5
Q

type 1 and type 2 ac generators

A

type 1 - constant RPM
type 2 - variable RPM

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6
Q

Parallel bus systems

A

older aircraft
load shared equally by all working generators

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7
Q

split bus

A

each generator powers only one main AC bus
two generators can’t power the same bus simultaneously
most apps are operational

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8
Q

split parallel power

A

safer
parallel - normal
split - isolated during malfuciton

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9
Q

constant speed drive

A

installed between variable speed engine and constant speed generator

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10
Q

integrated drive generators

A

generator and speed control to one unit

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11
Q

integrated drive advantages

A

weight / size reduction
higher RPM and power output
improved cooling

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12
Q

similarities CSD and IDG

A

hydraulic units
share oil with AC generator
oil cooling

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13
Q

variable rpm generators

A

type two
115V AC
frequency may change with engine rpm

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14
Q

variable speed constant frequency

A

400 hz output
solid-state circuitry
no need for CSD - more reliable

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15
Q

variable speed constant frequency advantages

A

no CSD
smaller / lighter
more versatile installation

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16
Q

variable speed constant frequency disadvantages

A

relatively lower power output
not as proven through one term operating

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17
Q

variable speed variable frequency AC generator

A

newer
output frequency changes with engine rpm
frequency made constant as needed during power distribution
high power output

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18
Q

RAT

A

provides limited electrical power if all engines are lost

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19
Q

static inverter

A

most critical AC power source
must be checked every night during routing maintenance
line replaceable unit

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20
Q

what is fluid power

A

transmission and conversion of power using a fluid

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21
Q

what is the application of fluid power

A

transmission of force and power through a distance

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22
Q

Boyle’s Law

A

PV/T = PV/T

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23
Q

Pascal’s Law

A

when a force is exerted on a confined fluid, the resultant pressure is transmitted equally and undiminished in all directions

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24
Q

gas vs liquid compressibility

A

liquids - non compressible
high % output achieved (low loss, high efficiency)
gas - highly compressible
loss in efficiency

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25
stroke
distance piston moves in a cylinder inches
26
volume
quantity of fluid contained in a reservoir, displaced by a pump, or displaced by an actuating cylinde in cubic inches
27
hydraulic fluid
medium by which power is transferred within an aircraft
28
hydraulic equations
F=PA V=AL f=force, p=pressure, a=area, L=length, V=volume
29
what is mechanical advantage
amount by which the applied effort is multiplied in the output of the device less distance = more forceq
30
what is flow rate measured in
gallons per minute
31
where do hydraulics have loss
friction within line component loss in motors and filters
32
better hydraulic fluids have _____ viscosity
low
33
what thermal characteristics do we want for hydraulic fluid
stable structure in all temperatures
34
what flammability for hydraulic fluid
high flash and fire point
35
what is flash point
lowest temperature at which a combustible liquid produces sufficient vapor to generate an ignitable mixture
36
What chemical stability for hydraulic fluid
high chemical stability
37
vegetable base fluid
blue older and not used much extremely flammable
38
mineral base fluid
red common in modern aircraft
39
what is blue hydraulic fluid made of
castor oil and alcohol mixture
40
what is red hydraulic fluid made of
petroleum distillate
41
what is purple hydraulic fluid made of
synthetic phosphate ester based fluid
42
synthetic base fluid
purple butyl seals used in high pressure / temperature applications low flammability very damaging to wiring, paint, insulation
43
what is the SDS
safety data sheet how to handle chemicals and what not
44
what should we use when messing with Skydrol
chemical safe resistant gloves rubber boot avoid all contact
45
rigid tubings advantage
can handle high pressure
46
rigid tubing disadvantages
cannot be used to connect vibration or movable components
47
flexible hose
low medium high pressure hoses specific to fluids
48
what hose type works for all fluids
teflon 1500-3000psi
49
fitting types
aluminum - low / medium pressure steel - high pressure
50
seal type
O ring (cross section is an O shape)
51
purpose of hydraulic filters
dirt is deadly, want it not there
52
primary purpose of reservoirs
supply fluid to pumps and system components
53
secondary purpose of hydraulic reservoirs
thermal expansion air purging filtration and sediment cooling
54
non-pressurized reservoir
vented to atmosphere to allow air to dissipate from system
55
hydraulic accumulator
stores hydraulic fluid under pressure back up or intermittent loads
56
hydraulic pumps
supply fluid flow to actuating units provide pressure to overcome system resistance
57
engine driven hydraulic pump
activated any time engine is running large systems
58
electric hydraulic pumps
single, short use tasks very efficient lighter aircraft
59
vane pumps
move more fluid than gear pumps need more maintenance
60
best type of hydraulic pump
piston pump
61
what do pressure relief valves do
protect system from damage due to excessive pressure buildup
62
what do flow control devices do
control direction of fluid flow control rate movement takes place determines sequence of movement
63
what is a check valve
allows fluid to flow in one direction only
64
4 way selector valve
moves actuators in two directions (flap movement)
65
3 way selector valve
moves flow in one direction
66
2 way selector valve
controls flow on and off
67
What is an actuating device
converts fluid flow to mechanical motion linear or rotary
68
purpose of landing gear
supports aircraft during ground operations dampens vibrations when taxiing cushions landing impact
69
retractable landing gear
more aerodynamic - saves fuel more complex more expensive
70
what is the trunnion
attaches landing gear assembly to airframe
71
what is the shock strut
vertical member of the landing gear
72
pivot fork and shaft
used when wheels are in tandem
73
torque arm
connects shock strut to truck
74
drag brace and side brace
stabilizes landing gear assembly longitudinally and laterally
75
shock strut purpose
supports weight of aircraft absorbs and displaces shock loads during landing
76
oleo struts
fluid passing through orifice acts to absorb shock of compression fluid is not compressible so it slows the strut collapse
77
energy returning struts
spring steel landing gear absorbs shock of landing (high wing Cessna type)
78
why do tubeless wheels have fuse plugs
allows plug to blow out and release tire pressure before wheel blows up
79
how are aircraft wheels retained
on the axle by a single axle nut in the center of the wheel cotter pin retains axle nut
80
what type of bearings do wheels have
roller bearings
81
segmented rotor disk brakes
more modern design better dissipate heat
82
advantage of disc brake over drum brake
better at dissipating heat
83
downside of disc brakes
single disk limits amount of friction obtained heavy aircraft may not have enough surface area to stop aircraft
84
what's a way to get air out of the brakes
bleed the brakes
85
how does the master cylinder work
master cylinder has flexible hoses that run to the caliper and sends hydraulic fluid
86
Cleveland type brake
piston actuates pucks on either side of disk to brake fixed disk
87
good year type brake
disk is floating
88
multiple disc problems
heat fires heat build up prevents effective braking
89
what indicator pin
how much material has been used
90
mechanical gear retraction
older and lighter aircraft powered by pilot operating lever or crank
91
electrical landing gear retraction
small and light enough hydraulics are not needed
92
hydraulic gear
all size of aircraft landing gear is large and not economically operated
93
Fuel strainer and filter purpose
remove foreign matters from fuel system

AT 202 (6 decks)

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