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UH60 > Night > Flashcards

Night Flashcards

1
Q

How heavy can counter weights be

A

0-22oz

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2
Q

Are counter weights required

A

no

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3
Q

How long does peak dark adaptation take to occur

A

Starts at 5 min, takes 30-45 minutes

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4
Q

What does the ABC do

A

Automatic brightness control

ABC for me

Controls brightness of output, slows flow of electrons

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5
Q

What does the BSP do?

A

Bright source protection

BSP for the NVG

It limits photocathode from taking in too much light, protects goggles

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6
Q

What causes a green monochromatic viewing image

A

the phosphor screen

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7
Q

When do rods work

A

They are always working, but work best at night

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8
Q

When do cones stop working

A

at 50% illumination

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9
Q

How big is the night blind spot

A

5-10 degrees

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10
Q

How do you compensate for the night blind spot

A

scanning, off center viewing by 10 degrees

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11
Q

What causes the night blind spot

A

lack of rods in the photocentralis

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12
Q

What is the goggles field of view

A

40 degrees

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13
Q

What vision is in use when flying under NVGs

A

mesopic

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14
Q

What is vection

A

You are still, other moving objects give you the illusion you’re moving

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15
Q

Crater illusion

A

When landing at night, the position of the landing light may be too far under the nose of the aircraft. This will cause the illusion of landing into a hole (crater)

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16
Q

Are you required to wear glasses behind NVGs

A

yes

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17
Q

How long does dark adaptation take after flipping goggles up

A

2-3 min

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18
Q

best visual acuity for goggles

A

20/25, 100% illum, clear air, high contrast

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19
Q

Dark adaptation after flash blindness

A

5-45 min depending on brightness and duration of flash

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20
Q

Operational defects (4)

A

Shading

Emission points

Edge glow

Flashing/flickering/intermittent operation

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21
Q

Break away force for NVGs

A

10-15Gs

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22
Q

monocular cues

A

Geometric perspective

Retinal image size

Aerial perspective

Motion parallax

23
Q

Parts of the NVD

A

Other peoples money pays for everything

Objective lens

photcathode

microchannel plate

phosphor screen

fiberoptic inverter

eye piece lens

24
Q

What is the visual acuity for worst NVD conditions

A

20/70 - 0% illum, hazy air, overcast

25
Q

Can we fly using NVGs with an operational defect? what about a cosmetic blemish?

A

No operational defect. Yes cosmetic blemish

26
Q

How fast does the moon move

A

15 degrees per hour (1 degree / 4 min)

27
Q

Can you mix lithium batteries and alkaline batteries in the same battery pack?

A

No*

28
Q

What is the normal day field of view

A

120 vertical, 200 lateral

29
Q

What is the normal night field of view unaided

A

80 degrees vertical, 120 lateral

30
Q

photopic light

A

Light intensities that are bright enough to stimulate the cone receptors and bright enough to “saturate” the rod receptors

31
Q

fovea centralis

A

area on retinal wall towards ears, high concentration of only cones, makes 85% of visual info, causes night blind spot

32
Q

Mesopic vision

A

occurs at dawn or dusk and involves both rods and cones, occurs when using NVGs

33
Q

scotopic vision

A

Low light vision - uses rods

34
Q

Cones

A

individually connected to nerves, function down to 50% illumination, high resolution low sensitivity to light, mostly located in the fovea

35
Q

optic disk

A

optic nerve connection/day blind spot (covered by overlapping fields of view)
Outboard from the back of the eyes (5 and 7 o clock position for left and right eyes viewed from the top)

36
Q

parafovea

A

the area surrounding the fovea, where vision is less acute. used for offset scan when looking at an object

37
Q

Best possible unaided night visual acuity

A

20/200

38
Q

Size of day blind spot and what causes it

A

5.5-7.5 degrees, the optic nerve

39
Q

How wide should scans be

A

30 degrees

40
Q

Geometric perspective

A

-Linear perspective (converging lines to vanishing point)

-Apparent foreshortening (changing altitude makes objects appear shorter/flatter or taller)

  • vertical position in field (far away appears higher on the horizon){
41
Q

Retinal image size

A

Known size of object

Increasing/decreasing size

Terrestrial association

Overlapping contours

42
Q

aerial perspective

A

Fading colors/shades

Loss of detail/texture

Position of light source/shadow

43
Q

motion parallax

A

apparent, relative motion of stationary objects viewed by a moving observer. Fast moving objects near, slow moving objects far. Awareness must be maintained in two directions to detect helicopter movement

44
Q

Optical flow

A

apparent angular rate and direction of movement of objects (due to aircraft movement) created with peripheral vision

Reduced peripheral when aided makes judging airspeed/rate of climb or descent difficult

45
Q

Contributors to SD

A

Bank > 30 degrees

Rapid head movement

Lack of ANVIS experience

46
Q

Size distance illusion

A

Viewing unfamiliar object, judged to be same as familiar object, distorts distance estimation

47
Q

Structural illusion

A

AC windshield

48
Q

Size constancy

A

Almost the same as size distance, clarify

49
Q

Use extreme caution when

A

flying from high to low ambient light conditions

50
Q

How do we prevent crater illusion

A

-Have landing/search light in proper position

-Anything except fully stowed

51
Q

What does ANVIS stand for?

A

Aviators Night Vision Imaging System

52
Q

What are the terrain cues?

A

-Size

-Shape

-Contrast

-Reflectivity

53
Q

What are the geometric prospectives?

A

-Linear perspective

-Apparent Foreshortening

-Vertical Position in the field

UH60 (29 decks)

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