TM 1-1520-238-10
Change 9
4-61
4.31 ARMAMENT PREFLIGHT PROCEDURES.
NOTE
Checks herein are only applicable if the ar-
mament 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 rever-
sal.
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.
WARNING
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.
11. INST light control – As desired.
4.31.3 IHADSS Boresight - CPG.
WARNING
OFFSET Boresight not authorized.
1. SIGHT SEL switch – HMD or HMD TADS.
2. GS switch– Press.
3. BRT and CONTRAST control – Adjust.
4. VID SEL switch – TADS.
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.
11. INST light control – As desired.
