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AEIS > AEIS CHAPTER 4 > Flashcards

AEIS CHAPTER 4 Flashcards

1
Q

(ICAO) stands for

A

International Civil Aviation Organisation

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2
Q

The ICAO defines the sea-level ISA as:
Pressure = ?
Temperature = ?
Humidity = ?

A

Pressure = 0 psi, Temperature: 15deg.celcius, Humidity: 0%

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3
Q

Define lapse rate

A

rate of change in temperature with altitude

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4
Q

Standard pitot-static head or probe is mainly used on i)

A

light aircraft

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5
Q

what is the key disadvantage of a standard pitot-static head or probe and what is done to combat it?

A

pressure probe prone to be blocked by sand and insects. thus a special “trapped” form of pressure probe is used

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6
Q

why is the electrically-heated pitot static tube used?

A

prevent ice formation at high altitudes or cold climates

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7
Q

what will happen if an electrically-heated pitot static tube is not used in cold climates?

A

probe openings get blocked, causing false indications or complete failure to the indicators

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8
Q

why is it better to seperate the static vent and pitot head?

A

static pressure obtained from pressure heads is not always a true value of still air pressure

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9
Q

pitot tube is usually located at i) for aircrafts operating at speeds above sound

A

fuselage nose

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10
Q

For aircrafts operating below speed of sound (343m/s), pitot tube is usually located i), ii), iii)

A

ahead of wing tip, ahead of vertical stablizer, or at side of fuselage nose section

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11
Q

where are static vents located?

A

on the skin of fuselage, one on each side of the fuselage

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12
Q

why are the static vents interconnected?

A

to minimise dynamic pressure effects

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13
Q

sensitive altimeter works through the i) which will move the ii) that drive the iii)

A

i) expansion and contraction of the water capsule
ii) mechanical linkages that drive the
iii) altimeter needles accordingly

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14
Q

when does the water capsule in a sensitive altimeter expands?

A

when aircraft is ascending, and static pressure decreases

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15
Q

when does the water capsule in a sensitive altimeter contracts? and comment on the static pressure

A

when aircraft is descending, and static pressure increases

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16
Q

compare the sensitive altimeters to a servo-assisted altimeter

A

servo-assisted altimeter are more accurate through use of electronics and motors

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17
Q

(VSI) stands for

A

vertical speed indicators

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18
Q

what is the function of a VSI

A

used to indicate if the aircraft is ascending, descending or in level-flight

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19
Q

if the VSI indicates 0, what does it mean

A

it means that the aircraft is in level-flight

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20
Q

VSI operates from i) , it is a ii) instrument

A

static pressure, differential pressure

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21
Q

during descend, the capsule in the VSI i) to indicate a descend because static pressure ii)

A

expands, increases

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22
Q

during ascend, the capsule in the VSI i) to indicate a ascend because static pressure ii)

A

contracts, decreases

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23
Q

(ASI)

A

Airspeed indicator

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24
Q

(ASI) measures the i) to indicate the speed of the aircraft

A

difference between pitot and static pressure

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25
Q

when the aircraft is parked on the ground, the two pressures in the (ASI) is i)

A

equal

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26
Q

which type of aircraft are required by the FAA to have Airspeed Indicator Markings?

A

aircraft weighing 12500 pounds or less

27
Q

What should be the ASI reading prior to takeoff

A

zero

28
Q

what should be the ASI reading prior to takeoff when there is a strong wind blowing into the pitot tube?

A

higher than zero

29
Q

what is used to measure the difference between pitot and static pressure in an ASI

A

a sensitive differential pressure gauge

30
Q

during acceleration at level flight, ascend or descent, the capsule in an ASI i)

A

expands

31
Q

during deceleration at level flight, ascend or descent, the capsule in an ASI i)

A

contracts

32
Q

when the pitot tubes are blocked when the aircraft is ascending at constant speed, the reading on the ASI will i) - read

A

over-read

33
Q

when the pitot tubes are blocked when the aircraft is descending at constant speed, the reading on the ASI will i) - read

A

under-read

34
Q

when the static ports are blocked when the aircraft is ascending at constant speed, the reading on the ASI will i) - read

A

under-read

35
Q

when the static ports are blocked when the aircraft is descending at constant speed, the reading on the ASI will i) - read

A

over-read

36
Q

when the pitot tubes leak when aircraft is ascending or descending, the reading on the ASI will i) - read

A

under-read

37
Q

when the static ports leak when aircraft is ascending or descending, the reading on the ASI will i) - read

A

over-read

38
Q

IAS refers to

A

indicated airspeed

39
Q

IAS =

A

airspeed indicator reading + instrument error correction

40
Q

CAS refers to

A

calibrated airspeed

41
Q

CAS =

A

IAS + pressure error correction

42
Q

EAS refers to

A

equivalent airspeed

43
Q

EAS =

A

CAS + compressibility error correction

44
Q

TAS refers to

A

True Airspeed

45
Q

TAS =

A

EAS + density error correction

46
Q

mach number is the ratio between i) and ii)

A

true airspeed(TAS) and the local speed of sound

47
Q

machmeter utilises the aircraft’s i) system to generate M

A

pitot-static system

48
Q

high speed aircraft, including airlines and business jets, have i) mach numbers

A

critical

49
Q

what happens if the critical mach numbers is exceeded?

A

it will create shock waves on the aerofoils resulting in buffet or mach tuck

50
Q

what is mach tuck

A

aircraft nose pitching downwards

51
Q

what is buffeting

A

where wings experience aerodynamic turbulence

52
Q

when aircraft is at a higher altitude at the same TAS, the mach number will i) because speed of sound ii)

A

increase, decreases

53
Q

machmeter makes use of a i) capsule and a ii) capsule

A

altimeter, airspeed

54
Q

airspeed capsule in a machmeter accepts i) inputs

A

pitot-static

55
Q

altitude capsule in a machmeter accepts i) inputs

A

static

56
Q

when the pitot tubes are blocked and the aircraft is ascending at constant speed, the mach number will i)-read

A

over-read

57
Q

when the pitot tubes are blocked and the aircraft is descending at constant speed, the mach number will i)-read

A

under-read

58
Q

when the static ports are blocked and the aircraft is ascending at constant speed, the mach number will i)-read

A

under-read

59
Q

when the static ports are blocked and the aircraft is descending at constant speed, the mach number will i)-read

A

over-read

60
Q

pitot-static testers are used to i)

A

check for leaks

61
Q

how do pitot-static testers check for leaks?

A

by simulating pitot and static pressures at different airspeeds and altitudes to the flight instruments

62
Q

EFD refers to

A

electronic flight display

63
Q

the high tech smart sensors for aircraft instrumentation are more i) and require less ii) compared to analogue counterparts

A

reliable, maintenance

AEIS (6 decks)

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