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and CPG (refer to paragraphs 8.17 and
8.18).
*8.16. STARTING APU -- PILOT.
NOTE
During cold weather starts at temperatures
below 0 °F (--18 °C), the 95% switch
is used to manually prevent PTO clutch
engagement until the APU has reached
95% NG. Prior to normal clutch engagement,
place and hold the spring loaded
95% switch to the 95% position. When the
APU ON advisory light illuminates, release
the switch to allow clutch engagement.
This procedure prevents shut down
of the APU at low speeds under extreme
cold conditions.
1. Fire guard -- Posted, if available.
2. APU -- Start as follows:
If ENG START LIGHT remains illuminated
after reaching 66 -- 68% NG, set
ENG START switch for affected engine
to IGN ORIDE, then OFF.
a. APU switch -- Set to RUN, pause, set to
START, then release.
b. APU FAIL caution light -- Within 5 seconds
of start, check extinguished.
c. APU ON caution light -- Check that light
illuminates.
3. GEN 1 and GEN 2 switches -- GEN 1 and 2.
TM 1-1520-238-10
Change 6 8-11
NOTE
ENGINES ONLY
Generators ON prior to engine start may
result in an erroneous TGT indication or a
mismatch between pilot and CPG TGT
gauges. The indicated TGT will be accurate
when the actual TGT, minus the 71
°C DECU bias equals a positive number.
4. Control locks -- Remove.
5. EXT PWR/BATT switch -- Set to BATT if external
power was used for start.
6. External power -- Disconnect. EXT PWR caution
light should be off.
*8.17. AFTER STARTING APU -- PILOT.
CAUTION
Do not turn PNVS power on immediately
after power was turned off. This
will damage 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 simultanously,
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 selftest
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
indicator 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.
L11. BUCS -- Test as follows:
a. RTR BK switch -- BRAKE.
b. Controls -- Friction off, centered, and
cleared.
c. BUCS TST switch -- PLT and hold. Warn
CPG that flight controls will move.
d. Observe BUCS ON caution light illuminates.
Hold switch in PLT position until
BUCS ON caution light is not illuminated
(approximately 20 seconds). If BUCS
FAIL warning light illuminates during
the test, do not fly helicopter.
e. If after 15 seconds, the BUCS FAIL warning
light does not illuminate, proceed to
step f.
f. BUCS TST switch -- CPG and hold. Warn
CPG that flight controls will move.
g. Observe BUCS ON caution light illuminates.
Hold switch in CPG position until
BUCS ON caution light is not illuminated
(approximately 20 seconds). If BUCS
FAIL warning light illuminates during
the test, do not fly helicopter.
h. BUCS select trigger (CPG) -- Press. Verify
illumination of BUCS FAIL warning light
in both crew stations.
i. Collective -- Full down.
j. RTR BK switch -- As desired.
L12. IHADSS boresight -- As required.
NOTE
The PNVS needs 1 minute for gyro runup
before PNVS turret assembly can be commanded
out of stow.
L13. FLIR operational check -- As required.
14. Radar altimeter -- Test.
TM 1-1520-238-10
8-12 Change 6
*8.18. AFTER STARTING APU -- CPG.
1. Control locks -- Remove.
　
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