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weapon will be that no correction to the line-of-sight or
weapon aiming based on the CBHK correctors will be
made. The sight or weapon will function normally but
without apparent boresight correction or alignment.
Validate the CBHK boresight correction values for the
affected subsystem prior to using the subsystem.
To check the FCC boresight corrector numbers, proceed
as follows:
1. Place the DEK mode select switch to FD/LS
or press CDU FD/LS FAB
Enter the letter B. The boresight menu page
will be displayed as follows:
TADS AL-20 VF-21 ED-22
GUN AL-23 VF-24 ED-25
PYLN AL-26 VF-27 ED-28
PNVS AL-29 VF-30 ED-31
The edit column (ED) is located to the right of the align
(AL) and verify (VF) columns and is the only column
the pilot will reference. The alignment, verification and
edit numbers are established by armament personnel
using the CBHK during aircraft systems boresight.
2. To check the boresight numbers in the FCC
against the boresight numbers on the boresight
page in the aircraft logbook, the aircraft
must be on the ground with the FCC operational.
To check the TADS, GUN, PYLN, or
PNVS boresight numbers, enter 22, 25, 28 or
31 respectively. The selected system boresight
edit numbers will be displayed in lieu of the
menu page. For example, to check the PNVS
boresight numbers, enter 31. The boresight
menu will blank and the PNVS edit page will
be displayed as follows:
PNVS CORRECTORS -MREL
+09.3 AZ -15.6
3. If the FCC numbers displayed match the logbook
numbers, proceed to another system by
entering a B, which recalls the boresight
menu, and enter the next appropriate number
for the desired system. The PYLN (ED-28)
data is displayed as one pylon number per
page across four pages. To move from one pylon
to the next sequentially, press the DEK
SPACE key or press CDU SPC
KEY and the next pylon in sequence (1-4
repeated) will be displayed.
4. If the FCC numbers displayed are not the
same as the logbook numbers, the pilot must
change the values to match the logbook values.
The protocol used to access the edit numbers
assigns an integer (1, 2, 3, 4, . . ) to data
locations on the page following the rule: left to
right, top to bottom. The top left data location
is addressed by entering a 1. The next data
location to the right is addressed by entering a
2, etc. When a data location is addressed by
the appropriate integer entry, the flashing
cursor will move from the top left corner to the
first digit in the data location. For example,
using the PNVS page from above, if the elevation
(EL) numbers were correct but the azimuth
(AZ) numbers were not the same as the
logbook values, the pilot would access the azimuth
location by entering a 2. The flashing
cursor would relocate beneath the 1 in -15.6.
5. Type in the logbook values. If the plus (t) or
minus (-) sign is not correct, use the DEK
BKSP key or CDU left arrow key
to move the cursor beneath the sign and
make the appropriate correction to match the
logbook values.
4-60 Change 4
TM 1-1520-238-10
4.31 ARMAMENT PREFLIGHT PROCEDURES.
NOTE
Checks herein are only applicable if the
armament is installed and are in addition
to those listed in Chapter 8. Except for
safety, Chapter 4 does not duplicate
Chapter 8 checks.
4.31.1 FLIR Operational Check.
1. SIGHT SEL switch NVS, check turret function.
2. Adjust gain and level for optimum image.
3. Verify capability to select the various modes of
flight symbology.
4. FLIR PLRT pushbutton Check polarity reversal.
5. Registration Check.
a. Align crewmembers LOS forward to the 12
o'clock position ± 5°.
b. Select a reference object approximately 90
feet in front of the aircraft.
c. Check registration (alignment differential)
between the thermal image and reference
object in azimuth.
d. The allowable registration error is 1 foot at
90 feet. The center open position of the
LOS reticle is equivalent to 1 foot at 90
feet.
e. If registration is out of tolerance refer to
TM 9-4935-476-13.
6. Alternate sensor Check.
4.31.2 IHADSS Boresight - Pilot.
OFFSET boresight is not authorized.
1. SIGHT SEL switch HMD.
2. VID SEL switch GRAY SC.
3. BRT and CONTRAST control Adjust.
4. VID SEL switch PLT.
5. SYM BRT control Adjust.
6. IHADSS BRSIT switch On.
7. INST light control Adjust BRU intensity.
8. Align HMD reticle with BRU.
9. BRSIT HMD switch Actuate then release.
10. IHADSS BRSIT switch OFF.
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