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Advanced Aircraft Systems Unit 3 > Unit 3 > Flashcards

Unit 3 Flashcards

1
Q

Measure of the force in an electrical system that causes current flow; measure of EMF

A

voltage

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2
Q

typical voltage

A

12V or 24V

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3
Q

Measure of electricity through a conductor

A

current

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4
Q

unit of current

A

amps

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5
Q

end of battery that electrons are attracted to

A

positive terminal

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6
Q

unit of resistance

A

ohm

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7
Q

what is resistance?

A

the “friction” an electron encounter as it flows
EMF must be required

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8
Q

which of the following best described the contributing factors to thermal runaway in a nickel-cadmium battery installed in an aircraft?

A

low internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential charging system

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9
Q

what do rectifiers do

A

AC to DC

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10
Q

what do rectifiers have

A

transformer, stack, and cabinet

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11
Q

what do inverters do

A

increase DC voltage, then DC to AC

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12
Q

how is electrical energy transferred from one circuit to another without any connections?

A

induction

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13
Q

how is the voltage output of an alternator regulated?

A

controlling the voltage output of the DC exciter
solid state transistor and a “zener diode” to regulate voltage

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14
Q

purpose of circuit breakers

A

designed to protect the circuit from damagingly high levels of current flow

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15
Q

tell me about DC

A

single direction
constant polarity
changes magnitude when current turns on and off

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16
Q

tell me about AC

A

direction of current changes
easy to generate
easily stepped up/down with transformers

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17
Q

with an electromagnet, what affects the strength?

A

winding a coil around a soft iron core

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18
Q

where to find lead acid batteries

A

piston

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19
Q

NiCad CONS

A

low internal resistance
long life
expensive
prone to thermal runaway

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20
Q

where to find NiCad batteries

A

turbine

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21
Q

what is useful load

A

crew, usable fuel, passengers, and cargo

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22
Q

independent braking system

A

pressure only as great as foot pressure applied

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23
Q

boosted brakes

A

actuating system that augments force with hydraulic pressure

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24
Q

aircraft with boosted brakes

A

medium to large aircraft that do not require a full power system

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25
Q

power brakes

A

use hydraulic system as source of power to apply the brakes

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26
Q

aircraft with power brakes

A

large and high performance aircraft

27
Q

expander tube brakes

A

1930s-1950s
lightweight, low-pressure brakes

28
Q

single disc brakes

A

friction to both sides of disc

29
Q

aircraft with single disc brakes

A

small, light aircraft

30
Q

aircraft with multiple disc brakes

A

large, heavy

31
Q

aircraft with segmented rotor

A

high performance

32
Q

purpose of torque links

A

wheel alignment
movement
prevents over extension

33
Q

function of oleo strut

A

absorbs shock of landing with hydraulic fluid

34
Q

when an air/oil type of landing gear shock strut is used, the initial shock of landing is cushioned by

A

the fluid being forced through a metered opening

35
Q

purpose of chines

A

deflect water away from fuselage

36
Q

types of hydraulic fluid

A

vegetable base
mineral base
synthetic, phsophate-ester

37
Q

color of veggie base

A

blue

38
Q

color or mineral base

A

red

39
Q

color of phosphate- ester

A

purple clear

40
Q

vegetable base hydraulic fluid

A

least used
oldest

41
Q

mineral hydraulic fluid

A

common in most aircraft

42
Q

phosphate-ester hydraulic fluid

A

skydrol
fire resistant
used in WW2

43
Q

how is fuel flow measured in fuel-injected engines

A

measure the pressure drop across the fuel injector nozzles

44
Q

what does a manifold pressure gauage indicate

A

absolute pressure inside induction system

45
Q

what does engine pressure ratio measure

A

differential pressure between tailpipe total pressure and compressor inlet total pressure

46
Q

how does a turbine tach indicate

A

reads RPM of low compressor and high pressure, and gives a percentage

47
Q

what is the purpose of an EGT gauge

A

measures the temperature of the exhaust gas
indicates combustion efficiency

48
Q

monocoque

A

hardly any internal framework

49
Q

semi-monocoque

A

internal arrangement of formers and stringer to provide additional rigidity and strength to the skin

50
Q

airfoil

A

shape of wing at any cross section

51
Q

angle of incidence

A

determined by manufacturer
angle between chord line and reference axis

52
Q

center of lift

A

point where lifting forces are concentrated

53
Q

center of gravity

A

point where weight forces are concentrated

54
Q

CG and CP relationship

A

CG forward of CP

55
Q

stall strips

A

cause wing to stall in non-critical locations before it normally would

56
Q

servo tabs

A

small-hinged device installed to assist movement

57
Q

relationship between alternator and battery

A

alternator spins and creates electricity for the battery

58
Q

seminole circuit breaker popping

A

tripped circuit breakers should be reset only if the affected system/component is considered essential for safety of flight

59
Q

voltage and amperage

A

two belt driven 28V, 65 amp alternators
13.6 amp-hour, 24V battery

60
Q

stops flow of current to the gear pump on the Seminole when on ground

A

squat switch

61
Q

stops the flow of current to the gear pump when gear is fully retracted

A

pressure switch

62
Q

“CHECK GEAR” CAS message causes

A
  • gear not down and locked and manifold pressure below 14”
  • gear position UP and airplane on the ground
  • gear not down and locked and flaps are extended 2/3rd notch
63
Q

empennage of Seminole

A

vertical stabilizer
all-moveable horizontal stabilator
rudder

64
Q

flaps on Seminole

A

flaps on wings
anti-servo tab mounted on trailing edge

Advanced Aircraft Systems Unit 3 (1 decks)

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