ANVIS 6 Flashcards
Where should you look during your OSAP?
Something high contrast that is 50m away
What are operational defects?
Defects relating to the reliability of the image intensifier and are an indication of stability, if identified are a cause for immediate rejection
Shading, Edge Glow, Flashing, Flickering, intermittent Operation, Emission Points
What is shading?
Each monocular should present a full circle, if shading is present a full circle will not appear
What is edge glow?
A bright area, sometimes sparkling, in the outer portion of the viewing area
What is flashing, flickering or intermittent operation?
The image may appear to flicker or flash, this can occur in one or both monocular
What is emission points?
A steady fluctuation of pinpoint bright light in the image area that does not go away when all light is blocked from the objective lense
What is a cosmetic blemish?
Usually a result from manufacturing imperfections that do not affect the image intensifier reliability and are not normally a cause for rejection
Bright spots, black spots, fixed pattern noise (honey comb), chicken wire, image disparity, output brightness variation, image distortion
What are bright spots?
Caused by a flaw in the film on the MCP. Small and not uniform and disappears when light is blocked out
What are black spots?
Usually from dirt or debris between the lenses, also be from sun exposure
What is fixed pattern noise (honeycomb)?
Usually from viewing bright lights, a faint hexagonal pattern will appear
What is chicken wire?
An irregular pattern of dark think lines in the FOV
What is image disparity?
Exists when there is a difference in brightness between two image intensifier assemblies
What is output brightness variation?
Varying brightness in or across the image area
What is image distortion?
Vertical objects appear to have a wave or bend
How do you know there is low battery associated with your NVGs?
Red LED at the bottom of the mount, indicates there are 30 minutes left
How much weight can you have as a counterweight for your NVDs?
No more than 22oz
What are the NVG considerations?
Color-no colors in the NVG
Airspeed limits-don’t out fly the visibility from the aircraft
Lights- be aware of whiteout, halo, tunnel vision
Magnification-there is none
Weather-can see through obscurations, may fly into IMC
Weapons-guns can blind you with auto brightness control
Aircraft lighting-no red lighting in cockpit, blue/green only
Distance/Depth-difficult to estimate
Scanning techniques- need to turn head and eyes
Obstruction detection-wires and towers are hard to see
Spatial D- avoid abrupt attitude changes, 30* max recommened
What are the NVG considerations?
Color-no colors in the NVG
Airspeed limits-don’t out fly the visibility from the aircraft
Lights- be aware of whiteout, halo, tunnel vision
Magnification-there is none
Weather-can see through obscurations, may fly into IMC
Weapons-guns can blind you with auto brightness control
Aircraft lighting-no red lighting in cockpit, blue/green only
Distance/Depth-difficult to estimate
Scanning techniques- need to turn head and eyes
Obstruction detection-wires and towers are hard to see
Spatial D- avoid abrupt attitude changes, 30* max recommend
What are the NVG characteristics?
D: A helmet mounted, light intensification device that allows aircrews to conduct operations at terrain flight altitudes during low ambient light levels
I: 2000-3500 x light intensification
A: Best acuity is 20/40 with ideal conditions and proper OSAP
L: limited field of view of 40*
V: voltage low indicator when voltage drop to 2.4, signaling 30 min left
P: power supply is 2 AA batteries
What does OSAP stand for?
Optimum
Site
Adjustment
Point
How does NVGs function?
Objective Lens: captures reflected light and inverts image
Photocathode: converts reflected light into electrons
Micro-Channel Plate: intensifies electrons
Phosphor Screen: turns intensified electrons into visible picture
Power Supply: provides 3.0 vdc
Fiber Optic Inverter: re-inverts image
Eyepiece Lens: how eye views image
