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Why is the germanium crystal used on the afocal assembly window?
it has favorable 8-14 micron wavelength transmission properties
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How can crews help protect the PNVS coating?
- stow if not used in flight
- put covers on when on ground
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Why does the PNVS have a cooler?
reduce distortion/video noise, and makes detectors more sensitive
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What are the two types of night vision devices available to crewmembers?
thermal images and image intensifiers
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What is the purpose of thermal imaging systems?
provide an IR image of a scene by detecting heat
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What is the advantage of thermal imagers over image intensifiers?
they don't need light
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What atmospheric elements affect the composition or density of the atmosphere and, therefore, affect IR signal transmission?
smoke, haze, dust, moisture, and fog
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What two factors create most of the parallax effect?
angle and distance
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How is the PNVS turned on?
automatically through APU (if set up through AMPS), manually on AGPU
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What is FLIR polarity?
WHT/BLK HOT
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What is important to remember about the ACM switch?
if it is on level and gain are not active
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How can a crewmember tell what polarity their FLIR system is in?
- look at the sky
- sky dark = whit hot
- sky light = blk hot
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How can the crewmember using the PNVS bring it out from the stow position?
NVS MODE switch to normal or fixed
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What four considerations must be met prior to optimizing FLIR?
- "FLIR NOT COOL" message gone
- scene rich in detail
- select desired polarity
- 1 control at a time
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Which should be optimized first, FLIR or IHADSS?
IHADSS
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What is the definition of FLIR optimization?
using a combination of level and gain to achieve best detail
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What is the primary objective of FLIR adjustment?
best quality image for flight environment
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What 2 things should crewmembers ensure before they optimize FLIR?
- ACM off
- FLIR/NVS NOT COOL message gone
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What establishes the FOV of the PNVS?
afocal assembly
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How can the crewmember in control of the PNVS stow the PNVS?
NVS mode switch - off
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What symbology is always presented on the PNVS display?
flight
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What does the NORM position provide the pilot?
- video
- symbology
- slaved to pilots helmet
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What does the FIXED position provide the pilot?
- 0 degrees azimuth
- -4.9 degrees elevation
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What major components are located within each section of the TADS?
- DSA: DVO(Direct View Optics), DTV, LST(Laser Spot Tracker), LRFD(Laser Range Finder and Designator)
- NSA: FLIR
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What must crews ensure on preflight for TADS operation?
covers off: DSA cover, NSA cover, Boresight Module cover
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What message will be presented to the crew if the TEU fails?
PNVS/NVS DIRECT
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Why is the TADS resolution not as good as the resolution of the PNVS?
designed for targeting, not for flight, medium resolution
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When is the TADS not an available selection as a sensor?
NVS mode switch is off
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If the CPG is using the TADS as a sight and it is required for NVS flight, what must the CPG do to gain control of the TADS as a sensor?
NVS mode switch - NORM or FIXED
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If either crewmember selects the TADS from a sight to a sensor, what image will be displayed on the HDU?
FLIR WFOV
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What symbology will be displayed on the HDU when using TADS as a sensor?
flight
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What is the fixed FOV of the TADS when used as a sensor?
30 X 40 degrees
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What is the slew rate of the TADS?
60 degrees/sec
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What are the two stow positions for the TADS?
- stowed - 0 elev and 180 az degrees
- fixed forward - 0 az and elev
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Which crewmember can stow the TADS?
CPG
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How can a crewmember select the opposite sensor?
NVS select switch
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Can the pilot always select the TADS from the CPG?
yes
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Can the CPG always select the PNVS from the pilot?
yes
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If both crewmembers are using a sensor, what happens if either crewmember selects the NVS select switch on the collective flight grip?
sensor swap
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