Malfunction Details - continued
Table 7-16.
Indications presented
to instructor/operator
Aircraft indications
Corrective
Required
Ref
and trainee
action
number and related effects
malfunction
Instructor: PNVS LOCKED
PNVS turret motion locks
Noncorrectable
23221
PNVS
appears on CRT.
in current azimuth and
LOCKED
elevation.
Trainee : Crew unable to
slew PRVS line-of-sight in
azimuth or elevation.
Noncorrectable
Instructor : PNVS VIDEO
Loss of PNVS video.
PNVS
23222
appears on CRT.
VIDEO
Trainee: No PNVS video when
PNVS is selected as video
source for IHADSS. IVD. or
VDU. Flight symbology re-
mains.
Noncorrectable
Instructor: PNVS AZ DRIVE
PNVS azimuth drive
PNVS AZ
23223
MTR appears on CRT.
motor failure.
DRIVE MTR
Trainee: Crew unable to
slew PNVS line-of-sight in
azimuth. Turret AZ locks in
current position.
Instructor: PNVS COOLER
Noncorrectable
Failure of Cooling to
23224
PNVS
appears on CRT.
IR detectors.
COOLER
Trainee: PNVS imagery gain
decreases and noise increas-
es over a period of 70 sec-
onds. PNVS NOT COOLED dis-
played on VDU.
