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UH60 > Night > Flashcards

Night Flashcards

(53 cards)

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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

Study These Flashcards
A

Geometric perspective

Retinal image size

Aerial perspective

Motion parallax

23
Q

Parts of the NVD

Study These Flashcards
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

Study These Flashcards
A

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

25
Can we fly using NVGs with an operational defect? what about a cosmetic blemish?
No operational defect. Yes cosmetic blemish
26
How fast does the moon move
15 degrees per hour (1 degree / 4 min)
27
Can you mix lithium batteries and alkaline batteries in the same battery pack?
No*
28
What is the normal day field of view
120 vertical, 200 lateral
29
What is the normal night field of view unaided
80 degrees vertical, 120 lateral
30
photopic light
Light intensities that are bright enough to stimulate the cone receptors and bright enough to "saturate" the rod receptors
31
fovea centralis
area on retinal wall towards ears, high concentration of only cones, makes 85% of visual info, causes night blind spot
32
Mesopic vision
occurs at dawn or dusk and involves both rods and cones, occurs when using NVGs
33
scotopic vision
Low light vision - uses rods
34
Cones
individually connected to nerves, function down to 50% illumination, high resolution low sensitivity to light, mostly located in the fovea
35
optic disk
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
parafovea
the area surrounding the fovea, where vision is less acute. used for offset scan when looking at an object
37
Best possible unaided night visual acuity
20/200
38
Size of day blind spot and what causes it
5.5-7.5 degrees, the optic nerve
39
How wide should scans be
30 degrees
40
Geometric perspective
-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
Retinal image size
Known size of object Increasing/decreasing size Terrestrial association Overlapping contours
42
aerial perspective
Fading colors/shades Loss of detail/texture Position of light source/shadow
43
motion parallax
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
Optical flow
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
Contributors to SD
Bank > 30 degrees Rapid head movement Lack of ANVIS experience
46
Size distance illusion
Viewing unfamiliar object, judged to be same as familiar object, distorts distance estimation
47
Structural illusion
AC windshield
48
Size constancy
Almost the same as size distance, clarify
49
Use extreme caution when
flying from high to low ambient light conditions
50
How do we prevent crater illusion
-Have landing/search light in proper position -Anything except fully stowed
51
What does ANVIS stand for?
Aviators Night Vision Imaging System
52
What are the terrain cues?
-Size -Shape -Contrast -Reflectivity
53
What are the geometric prospectives?
-Linear perspective -Apparent Foreshortening -Vertical Position in the field

UH60 (31 decks)

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