TD75

Question 1

TD 75 1. Some crewmembers may experience a pink, brown, or purple afterimage when they remove NVGs. This normal physiological phenomenon is called?

Answer 1

Color discrimination is absent when a crewmember views scenes through NVGs. The picture viewed is monochromatic (single color) and has a green hue due to the type of phosphor used on the screen. The green hue may cause crewmembers to experience a pink, brown, or purple afterimage when they remove NVGs.
This is called monochromatic adaptation and is a normal physiological phenomenon. The length of time the afterimage remains varies with each individual. FM 3-04.203

Question 2

2. The OSAP procedure is used for what purpose?

Answer 2

To precisely align each monocular to the individual eye to obtain the optimal sight picture.
Optimal sight alignment point

Question 3

3. If the dual contacts on your binocular assembly are dirty, what do you use to clean them?

Answer 3

Pencil eraser

Question 4

What is ambient light?

Answer 4

Ambient light is any atmospheric light, whether natural or artificial, providing useful illumination for the aircrew. Sources of ambient light include the moon, background illumination, artificial light, and solar light.

Question 5

What is the primary source of natural light at night, what is sky glow, and when do stars provide the most background illumination?

Answer 5

Ambient light is any atmospheric light, whether natural or artificial, providing useful illumination for the aircrew. Sources of ambient light include the moon, background illumination, artificial light, and solar light.

Question 6

What is the primary source of natural light at night, what is sky glow, and when do stars provide the most background illumination?

Answer 6

The moon is the primary source of natural light at night. Sky glow is a term for the ambient light produced by the sun when it is below the horizon. Stars provide some background illumination, especially on clear nights

Question 7

Artificial light is most pronounced during _____________________. Tactical employment of ____________________________ may be used with either unaided vision or NVG operations.

Answer 7

Overcast conditions.

Flare or illuminate rounds

Question 8

The function of Automatic Brightness Control (ABC) is?

Answer 8

Automatically reduces the voltage to the Micro-channel Plate to keep the image intensifiers brightness within a set limit. It creates a stable
image for the Aviator and prevents the output from becoming bright enough to impact the Aviators dark adaptation.

Question 9

This function reduces the voltage to the photocathode when the ANVIS is exposed to bright light sources. This function also protects the image intensifier from damage and enhances its life; however, it also has the effect of lowering resolution.

Answer 9

Bright Source Protection

Question 10

What factors increase the stress of aircrews during terrain flight, and how can these be minimized?

Answer 10

Knowledge that the darkness makes it difficult to see obstructions along the flight path causes stress. Added stress increases fatigue which
impairs judgment, slows reaction time, and degrades flight proficiency. Increased experience and proper personal preparation enables
aircrews to cope with the stress of night terrain flight. Proper preparation includes eating a good balanced diet, staying in good physical
condition and getting enough sleep. Night/NVG mission planning student handout