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en/dev-docs/ah64d/26.acq-sources.md

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+
+# ACQUISITION (ACQ) SOURCES
+
+Acquisition sources increase aircrew efficiency in orienting their sights to locations on the battlefield, whether it
+be to slave a sight to a target detected or tracked by another sensor onboard the aircraft (to include visual
+detection by either crewmember), or to slave their sight to a set of three-dimensional coordinates. The purpose
+of the acquisition source is to automate or reduce the need to manually search and acquire a target with the
+selected sight; acquisition sources do not directly affect the weapon aiming solution for any weapon system.
+
+![Acquisition sources on the battlefield](img/img-286-1-screen.jpg)
+
+
+In the case of the TADS or FCR, these sights will physically slew to the location of the acquisition source selected
+within the crewstation. In the case of the HMD, the crewmember will receive cueing indications within their
+helmet symbology of which direction they must direct their head to acquire the selected acquisition source (in
+lieu of a robotic arm physically grabbing their head and forcibly turning it in the correct direction). As several
+examples, the Copilot/Gunner (CPG) could select the Pilot’s helmet as the acquisition source to slave the TADS
+turret to a target that the Pilot is looking at, the Pilot could select TADS as the acquisition source to monitor the
+direction the CPG is aiming the TADS, or either crewmember could select a target point stored within the database
+to slave their sight to that 3-dimensional location.
+
+Each crewmember may select an acquisition (ACQ) source from the following list:
+
+- PHS – Pilot Helmet Sight                   
+- GHS – Gunner Helmet Sight                  
+- SKR – Tracking missile seeker              
+- RFI – Radar Frequency Interferometer                  
+- FCR – Fire Control Radar                   
+-  FXD – Fixed forward (0° in azimuth/-4.9° elevation)
+-  TADS – Target Acquisition Designation Sight
+-  W##, H##, C##, T## – Waypoint, Hazard, Control Measure, or Target/Threat
+-  TRN – Cursor-selected terrain location on the TSD
+
+As is the case with sight selections, choosing the best acquisition source in any given situation is key to reducing
+the time needed to search, acquire, and engage enemy targets. In most circumstances, the most important
+factors in choosing the correct acquisition source is proper coordination and communication between
+crewmembers; so that each crewmember is aware of how the other is using their selected sight, and whether a
+target should be handed off from one crewmember to the other for engagement by the appropriate sight/weapon
+combination.
+
+### ACQ Selection Logic
+
+In most cases, any of the available sights (HMD, TADS, or FCR) may serve as an acquisition source for another
+sight. However, a crewmember cannot select an acquisition source that is already selected as the sight within
+the same crewstation. For example, the CPG cannot simultaneously select TADS as a sight and an acquisition
+source, because the TADS cannot be slaved to itself (the TADS is already looking where it is currently looking).
+As such, some acquisition sources will be contextually removed from the acquisition selection menu if already
+selected as the crewmember’s sight (e.g., “TADS” will be removed from the CPG’s acquisition selection menu if
+the CPG has selected TADS as a sight).
+
+- If the Pilot’s selected sight is HMD, PHS will be removed from the Pilot’s ACQ selection menu.
+
+- If the Pilot’s selected sight is FCR, FCR will be removed from the Pilot’s ACQ selection menu.
+
+- If the CPG’s selected sight is HMD, GHS will be removed from the CPG’s ACQ selection menu.
+
+- If the CPG’s selected sight is TADS, TADS will be removed from the CPG’s ACQ selection menu.
+
+- If the CPG’s selected sight is FCR, FCR will be removed from the CPG’s ACQ selection menu.
+
+- If the FCR mast-mounted assembly is not installed, FCR and RFI will not be available within either
+     crewmember’s ACQ selection menu.
+
+- If the TADS is being used as an NVS sensor, TADS will be removed from the ACQ selection menu within the
+     same crewstation in which it is being used. (See Night Vision System for more information.)
+
+Acquisition sources may be selected from the WPN or TSD pages by opening the ACQ selection menu (VAB R6).
+Acquisition sources that are available for selection will be displayed, with the current ACQ selection boxed.
+
+![ ](img/img-287-1-screen.jpg)
+
+
+
+
+
+![Acquisition (ACQ) Selection Menu](img/img-287-2-screen.jpg)
+
+
+In many instances, an acquisition source may be available for selection, but the acquisition may be invalid and
+cannot provide cueing to a crewmember’s sight. When this occurs, the acquisition source will be displayed in
+white and annotated with a “?”. As an example, if a crewmember has not created a Terrain point on their TSD,
+TRN will be displayed within the ACQ selection menu but will be invalid until the crewmember creates a Terrain
+point.
+
+#### ACQ Slave Logic
+
+Once an acquisition source is selected within the CPG crewstation, the CPG’s sight must be “slaved” to it. The
+CPG may selectively enable (“slaved”) or disable (“de-slaved”) the Slave function using the SLAVE button located
+on the TEDAC Right Handgrip.
+
+- If the CPG selects a different sight, SLAVE is automatically disabled.
+
+- If the CPG selects a different acquisition source, SLAVE is automatically disabled.
+
+The Pilot does not have an option to selectively enable/disable the Slave function. The Pilot’s sight is always
+“slaved” to the Pilot’s acquisition source.
+
+- If the Pilot’s selected sight is FCR, the FCR will be slaved to the Pilot’s ACQ at all times.
+
+- The Pilot may selectively remove ACQ cueing from the HMD Flight symbology. (See WPN Utility sub-page
+     for more information.)
+
+In the case of setting the acquisition source to a point within the database (Waypoint, Hazard, Control Measure,
+or Target/Threat) or to a cursor-selected terrain location on the TSD (Terrain point), this action will also set that
+crewmember’s range source to a Navigation range when SLAVE is subsequently enabled.
+
+- If the CPG’s acquisition source is set to a Waypoint, Hazard, Control Measure, Target/Threat, or Terrain
+     point, the slant range to that point will be entered as a Navigation range when the SLAVE button is pressed
+     on the TEDAC Right Handgrip.
+
+- If the Pilot’s acquisition source is set to a Waypoint, Hazard, Control Measure, Target/Threat, or Terrain
+     point, the slant range to that point will be entered as a Navigation range immediately upon selection from
+     the ACQ selection menu.
+Typically, during training flights outside of a combat area, each crewmember selects the opposite crewmember’s
+helmet (GHS/PHS) as their acquisition source to facilitate traffic and obstacle advisories.
+
+During combat, it may be useful for the CPG to be slaved to GHS to remain “heads out” while searching for
+targets, and then de-slaving when a target or point of interest is acquired. The Pilot may often use TADS as the
+acquisition source to maintain situational awareness of where the TADS is oriented. This is particularly useful for
+the Pilot since it provides the Cued LOS Dot within the HMD Field-Of-Regard (FOR), which assists the Pilot in
+monitoring the position of the TADS turret so that he or she may maneuver the aircraft to avoid the turret slew
+limits.

en/dev-docs/ah64d/27.night-vision.md

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+
+# NIGHT VISION GOGGLES (NVG)
+
+The AN/AVS-6 Aviator Night Vision Imaging System (ANVIS) provides aircrews with a high-fidelity, binocular, 40°
+field-of-view under extreme low-light conditions. The AVS-6 NVG’s amplify light in the visible and near-infrared
+spectrum to enable aircrews to operate at NOE altitudes near terrain and other natural or man-made obstacles,
+under all but the darkest, moonless nights.
+
+
+![](img/img-289-1-screen.jpg)
+
+
+
+The HDU physically interferes with the proper wear of NVG’s (and can incur misalignments within the HDU
+symbology when viewed through the NVG’s) and may not be used simultaneously. If the NVG’s are enabled, the
+HDU will be rotated away from the crewmember’s face prior to the NVG’s being lowered into view. The IHADSS
+will continue to track the helmet position and aircraft sensors may be cued to the crewmember’s approximate
+line-of-sight, but NVG’s should not be used as a means of targeting due to the lack of precise aiming symbology.
+
+![](img/img-289-2-screen.jpg)
+