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UH-72 Lakota - 2022 > Acedemics test - theory of rotary wing > Flashcards

Acedemics test - theory of rotary wing Flashcards

1
Q

Define Ceiling

A

the lowest layer aloft reported as broken or overcast or the vertical visibility into an indefinite ceiling - if the sky is totally obscured, the vertical visibility will be the ceiling

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2
Q

LGTICCCCG is translated to:

A

Lightning - in clouds - clouds to clouds - clouds to ground

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3
Q

TSB40 is translated to:

A

Thunderstorm BEGAN at 40th minute of the hour

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4
Q

TSE23 is translated to:

A

Thunderstorm ENDED at 23th minute of the hour

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5
Q

PRESSRR / PRESSFR is translated to:

A

Pressure raising/decreasing rapidly

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6
Q

BKN 000

A

clouds <50ft

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7
Q

proximity (in RMK) - 3 afstande fra lufthavnen

A

On station - 0-5 statute miles
Vicinity (VS) - 5-10 stature miles
Distant (DSNT) - + 10 statuteMiles

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8
Q

Pk wind

A

In RMK if instant speed is >25 kts

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9
Q

Variable wind Direction

A

Velocity = +6kt
Direction = + 60*

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10
Q

ao2 is defined as

A

automated weather report from weather station with Precipitation discriminator

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11
Q

Two winds to define gust spread:

A

PK wind & minimum sustained

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12
Q

When will gust appear in the Metar

A

If gust spread is above 10kts

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13
Q

3 Types of Metar

A

METAR
SPECE
CORRECTED

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14
Q

RVR composition

A

RVR - Runway - Range in Ft

eks: RVR27G6000

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15
Q

4 sky coverages

A

FEW
BRK
SCT
OVC

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16
Q

Constitutes weather

A

Vertical precipitation (nedbør)
Horizontal obscuration (eks mist)

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17
Q

Temp / dew point - M23/M25 means

A

Temp = Minus 23
Dew = Minus 25

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18
Q

Where on the altimeter do you read your altitude

A

Kollsman window

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19
Q

Std lapsrate - Pressure & temp

A

Pressure - 1mm hg/1000ft
Temp - 2’C/1000ft

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20
Q

Std pressures & temp

A

Pressure: 29,92 Hg - 1013.2 mb/hPa
Temp: 15’C - 59’F

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21
Q

Which instruments uses only STATIC pressure

A

VSI
Altimeter

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22
Q

Which instruments uses both STATIC and PITOT pressure

A

Airspeed indicator

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23
Q

Define Indicated altitude

A

Read with the current (correct) altimeter setting and of the altimeter arrow

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24
Q

Define Absolute altitude

A

AGL altitude

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25
Q

Define True altitude

A

MSL altitude

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26
Q

Define Pressure altitude

A

altitude above SDP = standard datum plane

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27
Q

Define Density altitude

A

Density altitude is a function of PA and temp variation

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28
Q

Max altimeter error check

A

Field elv - Current altimeter setting = Max 75’ difference

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29
Q

You fly from a place with HIGHER pressure to a place with lower pressure, what is your TRUE altitude

A

Lower than indicated

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30
Q

Flying into an area of LOWER pressure without resetting the altimeter. would your TRUE altitude be higher or lower than your INDICATED?

A

Lower than indicated

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31
Q

Flying into an area of HIGHER pressure without resetting the altimeter, would your ALTIMETER indicate higher or lower than TRUE altitude.

A

Lower than true

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32
Q

Names of the pressure instruments

A

Altimeter
Vertical speed indicator
Airspeed indicator

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33
Q

2 pressures to determine atmospheric density

A

Dynamic , static

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34
Q

4 names of dynamic pressure that go into the pitot tube

A

Ram, total, pitot static, impact

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35
Q

what happens to IAS if static pressure decreases and the pitot pressure increases

A

IAS increases

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36
Q

Define IAS

A

Speed read on the Airspeed indicator

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37
Q

Define TAS

A

EAS calibrated for non std temp and pressure (DA)

38
Q

Define CAS

A

IAS calibrated for installation and instrument error

39
Q

That type of pressure is vented to the case of the VSI

A

Vented from the calibrated leak

40
Q

Lag delay in std VSI

A

few sec

41
Q

Pressure vented to the VSI diaphragm

A

Direct static pressure

42
Q

Difference between VSI and IVSI

A

Accelerometer

43
Q

Pito static system failure will affect which instrument

A

airspeed indicator

44
Q

Define inertia

A

Newtons 1. law - A body at rest will stay at rest & a body in motion will stay in motion until an outside force affects it

45
Q

Define newtons 3. law

A

For every action there is a reaction…..
occurs from hover to T/o

46
Q

What happens if there is an increase ind the airspeed over an airfoil?

A

Dynamic pressure increases
Static pressure decreases

47
Q

Define airfoil

A

Its a structure designed to produce lift

48
Q

Types of airfoil

A

Symmetric and unsymmetric / nonsymmetrical

49
Q

Definition of rotational relative wind

A

Parallel and opposite of the direction of the airfoil

50
Q

Relative wind velocity on the advancing blade equals rotor tip velocity _____ airspeed

A

Plus

51
Q

Relative wind velocity on the retreating blade equals rotor tip velocity _____ airspeed

A

Minus

52
Q

Definition of induced flow

A

Downward velocity of airflow

53
Q

Definition of resultant relative wind

A

Airflow that is modified by induced flow

54
Q

Is the angel of incidence (AOI) an aerodynamic or mechanical angel

A

Mechanical

55
Q

Where is the angel of incidence measured from and to

A

Chord line to tip pan plane ( plane of rotation)

56
Q

Where is the angel of attack measured from and to

A

Chord line to resultant relative wind

57
Q

Is the AOA an aerodynamic or a mechanical angel

A

Aerodynamic

58
Q

2 components of total force

A

Lift and Thrust

59
Q

2 components of Total aerodynamic force (TAF)

A

Lift and drag

60
Q

Lifts relationship to resultant relative wind

A

Perpendicular

61
Q

What is drags relationship to resultant relative wind

A

Parallel but in the same direction

62
Q

Names of the 4 types of drag

A

Parasitic, Profile, Induced, total

63
Q

Which drag increases proportional with airspeed

A

Parasitic drag

64
Q

Which is the most critical drag in high power helicopter operations (Hover)

A

Induced

65
Q

As we increase induced drag or induced flow, what happens to AOA

A

Decreases

66
Q

Definition of dissymmetry of lift

A

Unequal lift on the advancing and retreading sides of the rotor disk

67
Q

Definition of Blowback

A

When blade flapping has compensated for dissymmertry of lift, the rotor disk is tilted to the rear

68
Q

What does the helicopter do to compensate for dissymmetry of lift

A

Flapping

69
Q

What does a pilot do to control dissymmetry of lift

A

Cyclic feathering

70
Q

What are the two conditions of flight which of Newtons laws do they apply to

A

Balanced - 1. Law (Inertia)
Unbalanced - 2. Law (acceleration)

71
Q

The 3 types of rotor systems

A
  1. Fully articulated
  2. Semi-rigit
  3. Rigit
72
Q

Rotor blade coning is a compromise between what two forces

A

Centrifugal force and Lift

73
Q

Definition of Centrifugal force

A

An outward force produced whenever a body moves in a curved path

74
Q

Definition of rotor blade coning

A

Upward flexing of the rotor blades

75
Q

Describe the twist of the rotor blade on standard american helicopters

A

Higher pitch angel at the root of the rotor blades and lower pitch angel at the tip of the rotor blades, to distribute the lifting force more evenly along the blade

76
Q

Define torque effect on a single rotor helicopter system

A

Counter-rotative blades, nose yaw opposite direction, use anti-torque pedals to correct it.

77
Q

What is the relationship of total force to the tip path plane

A

Perpendicular

78
Q

The 4 causes of excessive coning

A
  1. High Gross weight
  2. Low RPM
  3. High G manuvers
  4. Turbulent air
79
Q

Rotation of the main rotor blades produces

A

Relative wind

80
Q

The difference between an IGE and an OGE is what in hover operations

A

Hard surfface

81
Q

Definition of Effective Transational Lift (ETL)

A

The rotor completely outruns the recirculation of old vortices and begins to work in relatively undisturbed air

82
Q

Speed parameters for ETL

A

16 - 24 kts

83
Q

What occurs during Transvers flow effect (TFE)

A

Forward part of the rotor: Going from vertical flow to horizontal flow
Rear part of the rotor: Still effected by induced flow

84
Q

Speed parameters Transvers flow effect (TFE)

A

10 - 20 kts.

85
Q

3 faktors for a dynamic rollover

A
  1. Pivot point
  2. Roling motion
  3. Exceeding critical angel
86
Q

3 conditions for setteling the power

A
  1. Vertical or near-vertical descent 300 F/PM
  2. Airspeed less than ETL
  3. 20 - 100 % power
87
Q

2 faktors that condribute to a dynamic rollover

A

Human and physical

88
Q

The Helicopter has entered a retreating blade stall. What should you expect the helicopter to do

A

Pitch up and roll left

89
Q

What would be the primary factor for entering a retreating blade stall

A

Excessive airspeed

90
Q

If you depart a base with an altimeter setting of 29.82 and hour later receive a new altimeter setting of 30.22, how much higher or lower than true altitude would the altimeter indicate prior to adjusting the altimeter to the new setting

A

400’ Lower

91
Q

At the last reporting point, you corrected the altimeter by setting the Kollsman scale on 29.92 Hg. Prior to landing, you received a new setting of 29.80. What is your True altitude in relation to indicated altitude (Before you reset the altimeter)

A

120’ Lower

92
Q

When flying into an area of colder than standard temperature, would the indicated altitude be more or less than true altitude

A

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UH-72 Lakota - 2022 (42 decks)

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