NVS Flashcards
What are the two types of night vision devices available to crewmembers?
Image Intensifiers (I2) and Thermal Imaging (FLIR)
What is the purpose of Thermal Imaging systems?
To provide an IR image of a scene by detecting heat.
What is the advantage of Thermal Imagers over Image Intensifiers?
No light is required to operate a thermal imager.
What atmospheric elements affect the composition or density of the atmosphere and, therefore, affect IR signal transmission?
Moisture, Fog, Dust, Haze, and Smoke
What two factors create most of the Parallax Effect?
- Angular difference between the M-PNVS and the HDU
- Distance from the item being observed
Close-in at a 90 degree angle is the worst parallax effect
What function does the M-PTUR Receiver perform?
Converts Infrared (IR) images to 16 analog outputs to the FLIR processor.
What is the function of the M-PECA?
Amplifies azimuth and elevation commands and sends them to the drive motor to move the turret.
What are the three types of Built-In-Tests (BITs)?
Start-up (S-BIT), Continuous (C-BIT), and
Initiated (I-BIT).
What causes frozen video?
Loss of video link communications
What does loss of bus communications results in?
Affected turret (M-TADS/M-PNVS) will move to fixed forward in 5 seconds
What causes cloud shifting?
Dynamic Range Compression and IR detector non-uniformity
How is the M-PNVS turned on?
WPN-UTIL Page
Automatically if initial power came from the APU
Manually if using an AGPU
What is FLIR polarity?
FLIR polarity is a shade reversal effect applied to the FLIR in order to view an item more clearly. The resulting selection is referred to as “White Hot” and “Black Hot”
How can a crewmember tell what polarity their FLIR system is using?
Look at the sky (Clear Sky)
Sky Dark = White Hot
Sky Light = Black Hot
How can the crewmember using the M-PNVS bring it out from the stow position?
Placing the NVS Mode Switch into the NORM or FIXED position
What are the four considerations for FLIR optimization?
FLIR must be cooled
Scene rich in detail
Select a polarity
Only one control should be adjusted at a time
Which should be optimized first, the FLIR or the IHADSS?
IHADSS
What is the definition of FLIR optimization?
Using a combination of level and gain to achieve the best detail
What is the primary objective of FLIR adjustment?
Obtaining the highest possible picture quality for the flight environment (obtaining a quality image).
What two things should crewmembers ensure before they optimize the FLIR?
Ensure that the “NVS NOT COOL” or “FLIR NOT COOL” message is no longer present and that the “ACM” is OFF
When is an optimization required?
Required when the crew is going to use the FLIR for Flight, Laser Ops, and Weapons.
What establishes the FOV of the M-PNVS?
Afocal Assembly
How can the crewmember in control of the M-PNVS stow it?
Place the NVS Mode Switch to OFF
What symbology is always presented on the M-PNVS display?
Flight
What does the NORM position provide the pilot?
Provides M-PNVS video that is slaved to the pilot’s helmet mounted display (HMD).
What does the FIXED position provide the pilot?
Provides the pilot with a M-PNVS that is fixed forward at 0 degree’s in azimuth and -4.9 degrees in elevation
The M-TADS is divided into what two major sections?
M-DSA
M-NSA
What major components are located within each section of the TADS?
M-DSA= DTV, LST, LRFD
M-NSA= FLIR
What must crews ensure on preflight for M-TADS operation?
Covers OFF – M-DSA Cover, M-NSA Cover, Boresight Module Cover
Why is the M-TADS resolution not as good as the resolution of the M-PNVS?
M-TADS was not designed for Flight. It was designed for targeting. (M-TADS is a Medium Resolution FLIR) f/2.3 vs f/1.5
When is the M-TADS not an available selection as a Sensor?
When the NVS Mode Switch is “OFF” (It is available as a Sight when the NVS Mode Switch is “OFF”).
If the CPG is using the M-TADS as a Sight and it is required for NVS flight, what must the CPG do to gain control of the M-TADS as a Sensor?
Place the NVS Mode Switch to NORM or FIXED.
If either crewmember selects M-TADS from a Sight to a Sensor, what image will be displayed on the HDU?
FLIR image, Wide FOV
What symbology will be displayed on the HDU when using M-TADS as a Sensor?
Flight Symbology
What is the fixed field of view of the M-TADS when used as a Sensor?
30 X 40
What is the slew rate of the M-TADS?
60 degrees per second
What are the two stow positions for the M-TADS when not in use?
TADS STOW 180º
TADS Alternate Stow: 0º Azimuth, 0º Elevation and not being used as a Sight or Sensor
Alternatively; stowed internally or stowed fixed forward
Which crewmember can stow the M-TADS?
CPG
How can a crewmember select the opposite sensor?
NVS Mode switch other than OFF (IE: NORM or FIXED), NVS Select Switch to selected sensor
Can the pilot always select M-TADS from the CPG?
Yes
Can the CPG always select M-PNVS from the pilot?
Yes
If both crewmembers are using a sensor, what happens if either crewmember selects the NVS Select Switch on the Collective Flight Grip?
Sensor Swap
