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LRF/D Two-position guarded trigger. The first detent will fire a ranging burst and stop. If
trigger continuous range or designation is desired, press trigger to second detent.
Boresight Up Enables the IAT during TADS internal Boresighting or enables the AZ and EL pots
Enable during TADS outfront boresight.
Center Disables all functions.
Down Enables DVO boresight adjust switch.
DVO adjust Three position, center maintain switch. Used to slew the DVO boresight
adjustment in a helical motion.
4.24 TARGET ACQUISITION DESIGNATION SIGHT
(TADS) AN/ASQ-170.
If the pilot commands TADS away
from the CPG, the CPGs sight
defaults to IHADSS. The gun can still
be fired without re-actioning, once
the sight has changed.
The TADS provides the CPG with day and night target
acquisition by means of a direct view optical (DVO)
telescope, a day television (DTV), and a forward looking
infrared (FLIR) sensor system. The sensors may be
used singly, or in combination, depending on the tactical,
weather, and visibility conditions. Target tracking may be
accomplished manually; automatically, using the image
auto-tracker (IAT); or by using the laser spot tracker
(LT). The laser spot tracker facilitates target handoff
from another laser designator. Linear motion
compensation (LMC) aids in the tracking of moving
targets either manually or automatically. The image
autotracker has the capability to offset track one target,
while automatically tracking another target. The TADS
receives 115 vac power from the No. 1 essential ac bus
and 28 vdc power from the No. 1 essential dc bus and is
protected by the TADS AC and TADS DC circuit
breakers located on the CPG circuit breaker panel. The
TADS is continuously monitored by FD/LS; on-command
test (test 14-TADS) will fault isolate to the LRU.
The Optically Improved (OI) configuration TADS contains
special optical filters which provide laser threat protection
in the FLIR and Direct View Optics (DVO) modes of
operation.
4.24.1 Ol Configuration. The OI configuration Night
Sensor Assembly (NSA) contains selectable filters which
will block different laser wavelength bands. These filters
prevent lasers which operate in these bands from
jamming the FLIR video (causing it to "bloom") should
the lasers be directed at the TADS. The OI configuration
ORT FLTR SEL switch is used to select one of four
possible filter types: (a) the CLEAR filter is used for
normal operation and provides no laser threat protection;
(b) the S (for short) filter provides protection against
lasers operating in the short wavelength band; (c) the L
(for long) filter provides protection against lasers
operating in the long wavelength band; and (d) the MAX
filter provides protection against lasers operating in both
the S (short) and L (long) wavelength band.
a. Ol Special Filter Coatings. Special filter
coatings are applicable to Direct View Optics lenses
contained in the OI configuration Day Sensor Assembly.
These filter coatings provide the CPG with eye protection
against certain laser threats should the CPG happen to
view those laser threats through the DVO. Because the
filters are coatings applied to fixed optics, they are
always in place and require no action on the part of the
CPG to activate.
4-40 Change 3
Right Hand Grip (cont)
TM 1-1520-238-10
4.24.2 TADS Equipment Data. TADS equipment data
is contained in figure 4-16 and table 4-13.
Table 4-13. TADS Equipment Data
Parameter Function
Normal Azimuth Operating Range +120 degrees/
-120 degrees
Azimuth Stow Position -180 degrees
Elevation Operating Range +30 degrees/
-60 degrees
Maximum Slew Rate (WFOV FLIR) 60 degrees
per second
Fields of View (diagonal measurement)
DVO
Wide
Narrow
DTV
Wide
Narrow
Zoom
FLIR
Wide 50.0 degrees
(identical to PNVS)
Medium 10.0 degrees
Narrow 3.1 degrees
Zoom 1.6 degrees
4.24.3 Operation Data. (1) Manual Servo Drift Null. The manual servo
18.0 degrees
4.0 degrees
4.0 degrees
0.9 degree
0.45 degree
a. Drift Null. The TADS system has the capability
to null the turret servo drift by either of two methods.
Servo drift can be identified as happening when ever
the TADS turret is under manual control, the CPG is
not making any inputs with the thumbforce controller
and the reticle appears to drift off the aim point. The
aim point should remain within the narrow FOV of the
DTV for 30-seconds. If it does not, or a lesser amount of
drift is desirable, adjust as follows:
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