TM 1-1520-238-10
9-20
Change 9
Section II. MISSION EQUIPMENT
9.16 MISSION EQUIPMENT FAILURES AND
MALFUNCTIONS.
Emergency operation of mission equipment is con-
tained in this section, insofar as its use affects safety of
flight.
9.16.1 Wing Stores Jettison.
CAUTION
Do not jettison Hellfire missile if hang-
fire is in progress (i.e. missile is still ig-
nited).
a. Armament Wing Stores.
1. Airspeed – 120 KIAS maximum.
2. Selected STORES JETT switches – Activate.
OR
3. ST JETT – Press.
b. External Fuel Wing Stores.
1. Airspeed – 100 KIAS maximum.
2. Selected STORES JETT switches – Activate.
OR
3. ST JETT – Press.
9.16.2 ENCU Malfunction.
1. ENCU switch – OFF.
2. ECS panel – STBY FAN if desired.
3. Emergency crew station ventilator door –
Open if desired.
9.16.3 PNVS/IHADSS Failure.
WARNING
If night or simulated night NOE, reac-
tion to the following malfunctions must
be immediate. Exit the NOE environ-
ment immediately.
NOTE
During rolling maneuvers, a phenomena
known as AC coupling may degrade the
PNVS imagery. Generally, this image deg-
radation will worsen as the bank angle is
increased. To reduce the adverse affects
of AC coupling, the pilot should reduce the
amount of sky visible within the PNVS field
of view by viewing the terrain below the
horizon.
a. PNVS Failure.
Pilot NVS select switch – TADS. Switch over to TADS
WFOV. FLIR image should occur in about 3 seconds.
TADS slew rates are noticeably slower in azimuth than
PNVS. Some gain and level adjustment is usually nec-
essary for optimum image.
NOTE
In the event of a GEN-1 failure, the auto-
matic power transfer to GEN-2 will result
in gray-scale selection in the HDU on
some aircraft. Should this condition occur,
resetting the VID SEL switch to TADS will
restore normal video.
b. IHADSS/HDU Failure.
WARNING
In the event of IHADSS failure with gun
selected, the gun will be commanded
to the fixed forward position. Once in
this position, the gun can still be fired
without having to re–action the gun.
Pilot
1. Establish visual flight.
2. VDU control switch – PLT.
3. ACQ SEL – NVS FXD.
OR
CPG
1. CPG SIGHT SEL switch – NVS.
2. PLT/GND ORIDE switch – ORIDE.
3. NVS select switch – PNVS or TADS.
4. CPG assume helicopter control.
9.16.4 Dual IHADSS/HDU Failure.
Pilot
1. Establish visual flight.
2. VDU control switch – PLT.
3. ACQ SEL – NVS FXD.
OR
CPG
1. Establish visual flight.
2. CPG assume helicopter control.
