TM 1-1520-238-10
4-48
Change 3
Table 4-16.
High Action Display Sight Status
Crewmember
Message
Description
P/CPG
IHADFAIL
The IHADSS has been detected as NO-GO for that crew
station by FD/LS. The IHADSS LOS defaults to fixed
forward for the affected crew station.
P/CPG
BORESIGHT . . . REQUIRED
IHADSS boresight required.
P/CPG
IHADSLOS . . . INVALID
The IHADSS SEU has computed an invalid LOS for that
crew station. This can be caused by the crewmembers
head outside of the head motion box or blockage of the
line-of-sight between the SSU and the helmet. The
IHADSS LOS is frozen at the last valid computation until
the LOS is computed as valid.
P
PNVSFAIL
FD/LS has detected the PNVS turret or electronics as
NO-GO.
P
PNVS NOT . . . COOLED
The PNVS FLIR has not cooled down for optimum
performance; cool down time should not exceed 20
minutes.
P
PNVS . . DIRECT
FD/LS has detected the TADS Electronics Unit (TADS
computer) as NO-GO. The PNVS turret is being directed
by the IHADSS SEU. The PNVS turret azimuth range may
be limited to 75 degrees left and right.
P/CP
LIMITS
The PNVS or TADS is at a gimbal limit.
P/CPG
FORWARD
The PNVS or TADS has been slaved to fixed forward
through use of the ACQ SEL switch.
P/CPG
PNVSBST?
The FCC has detected an alteration of internal values
affecting the PNVS alignment. The PNVS will function
normally but without alignment correction.
P/CPG
TADSBST?
The FCC has detected an alteration of internal values
affecting TADS boresight harmonization. The TADS will
function normally but without CBHK correction.
P
INVALID . . . CPGLOS
ACQ SEL switch is in the CPG position and there is no
valid CPG LOS.
P
UP=? LO=?
Pilot has actioned the missile system. If a ? is present, no
missiles are coded and ready. When the missiles are
coded and ready or tracking, the code letter will be
displayed. The code of the priority channel will flash.
CPG
TADSFAIL
FD/LS has detected the TADS system as NO-GO.
