TM 1-1520-238-10
Change 8
8-11
*8.17. AFTER STARTING APU – PILOT.
CAUTION
Do not turn PNVS power on immediately
after power was turned off. This will dam-
age the PEU. If PNVS switch was just set
to OFF, Wait a minimum of 10 seconds
before doing step 1 below.
NOTE
If both TADS/PNVS are to be used simulta-
nously, TADS must be turned on prior to
PNVS power up to ensure proper operation
of both systems.
1. PNVS switch – As required. (Verify TADS on)
2. Standby attitude indicator – Uncage.
3. VDU switch – As desired.
4. Radar altimeter – On.
5. Avionics – As desired.
6. Canopy door – Secure.
CAUTION
Ensure both pilot and CPG control
locks are removed and that both pilot
and CPG collective friction is off.
Do not execute control sweep or
BUCS test unless rotor is completely
stopped.
NOTE
Control motions during the BUCS self-test
should be rapid and positive. Any jerkiness
or oscillations during movement indicates
possible fault in the subsystem.
7. FCC – Verify CPG entered present position.
8. Control sweep – FORCE TRIM – OFF. Check
cyclic, collective and pedals for freedom of
movement. Neutralize cyclic and pedals; place
collective full down. Position indicators on base
of cyclic are not used for centering. FORCE
TRIM – ON and operational.
9. Stabilator – Check for full travel and position in-
dicator function – Reset.
10. HARS control switch – for
and previous
FCC software select NORM. For emeregency
operations select FAST. For
FCC software
select NORM for stationary starts, or FAST for
airborne or moving starts.
11.
BUCS – Test as follows:
a. RTR BK switch – BRAKE.
b. Controls – Friction off, centered, and
cleared.
WARNING
During both Pilot and CPG BUCS test,
the crew should be aware that the flight
controls will move. If BUCS FAIL warning
light illuminates during either test, DO
NOT FLY THE HELICOPTER.
c. Announce to CPG – you are initiating a
BUCS test.
Remain clear of flight controls.
d. BUCS TST switch – PLT and hold. BUCS
ON caution light should go out in approxi-
mately 20 seconds. Release switch and wait
15 seconds to see if BUCS FAIL warning
light illuminates.
If BUCS FAIL warning
light illuminates, do not fly the helicopter.
If
not proceed to step e.
e. BUCS TST switch – CPG and hold. BUCS
ON caution light should go out in approxi-
mately 20 seconds. Release switch and wait
15 seconds to see if BUCS FAIL warning
light illuminates.
If BUCS FAIL warning
light illuminates, do not fly the helicopter.
If
not proceed to step f.
f. BUCS select trigger (CPG) – Press. Verify il-
lumination of BUCS FAIL warning light in
both crew stations.
g. Collective – Full down.
h. RTR BK switch – As desired.
12. IHADSS boresight – As required.
NOTE
The PNVS needs 1 minute for gyro runup
before PNVS turret assembly can be com-
manded out of stow.
13. FLIR operational check – As required.
14. Radar altimeter – Test.
