8.14 BEFORE STARTING APU CPG.
*1. MASTER CAUTION panel Check that the fol-
lowing are illuminated.
a. LOW RPM ROTOR.
b. ENG 1 OUT.
c. ENG 2 OUT.
2. MASTER CAUTION panel: PRESS TO TEST
Check that all caution/warning lights illuminate.
3. Caution/warning panel Check that the follow-
ing segments are illuminated.
a. PRI HYD.
b. UTIL HYD.
c. MAN STAB (BATT).
d. MAIN XMSN 1.
e. MAIN XMSN 2.
f. ENG 1.
g. ENG 2.
h. ELEC SYS FAIL (BATT).
i. ENG ANTI ICE.
j. ADS (EXT PWR).
k. TADS (EXT PWR).
4. Engine instrument test panel switch TST.
Check engine/rotor instrument segment lights
and digital display (888) illuminates.
8.15 STARTING ENGINES EXTERNAL
PRESSURIZED AIR SOURCE PILOT.
Control sweeps and BUCS self-test are not
mandatory prior to external air start. If
checks are desired, connect a 3000 psi ex-
ternal hydraulic source to the primary hy-
draulic system to accomplish the checks.
1. External air source Connected to helicopter.
2. Pressurized air Verify available at helicopter.
Control locks Remove.
L4. Engines Start same as normal (refer to para-
5. GEN 1 and GEN 2 switches GEN 1 and 2.
6. EXT PWR/BATT switch To BATT if external
power used for start.
7. External power Disconnect.
8. External air source Disconnect.
9. Continue with AFTER STARTING APU Pilot
and CPG (refer to paragraphs 8.17 and 8.18).
*8.16. STARTING APU PILOT.
During cold weather starts at temperatures
C), the 95% switch is used
to manually prevent PTO clutch engage-
ment 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 advi-
sory 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:
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 illu-
3. GEN 1 and GEN 2 switches GEN 1 and 2.
When the generators are placed ON, an er-
roneous TGT indication or a mismatch be-
tween pilot and CPG TGT gauges may oc-
cur. The indicated TGT will be accurate
when the actual TGT, minus the 71
equals a positive number.
Control locks Remove.
5. EXT PWR/BATT switch Set to BATT if exter-
nal power was used for start.
6. External power Disconnect. EXT PWR caution
light should be off.