8-22 Change 3
b. AUTO PROP anti-ice switch ON (mo-
mentarily). Check for PROP AMP meter
shows indication and the overhead DC %
LOAD meter shows a rise.
c. MANUAL PROP anti-ice switch ON.
(momentarily). Check for loadmeter rise.
d. SURFACE deice switch SINGLE
CYCLE AUTO. Check for drop in pneu-
matic pressure and wing deice boot infla-
tion, and after 6 seconds for a second drop
e. SURFACE deice switch MANUAL.
Check that surface boots inflate and re-
main inflated while switch is held in
MANUAL. Release switch and check that
the boots deflate.
f. ANTENNA deice switch SINGLE
CYCLE AUTO. Check for a drop in pneu-
matic pressure and antenna deice boot
g. ANTENNA deice switch MANUAL.
Check that boots inflated, and remain in-
flated, then OFF.
h. RADOME anti-ice switch ON. Check for
loadmeter rise and pneumatic pressure
drop, then off.
10. Pneumatics/vacuum/pressurization Check
a. PNEUMATIC PRESSURE gage/GYRO
SUCTION gage Check in green arcs.
b. CABIN ALT controller Set 500 feet low-
er than field pressure altitude.
c. Cabin pressurization RATE control Set
d. ENVIRO & PNEU BLEED AIR valve
switches (2) ENVIRO & PNEU off.
e. Pneumatic pressure gage/gyro suction
gage Check. Pressure should drop to
f. BL AIR FAIL OFF annunciators (2)
g. BL AIR FAIL annunciators (2) Check
h. CABIN PRESS switch TEST (hold).
i. LEFT PNEU & ENVIRO BLEED AIR valve
j. L BL AIR OFF annunciator Check extin-
k. L and R BL AIR FAIL annunciators
l. PNEUMATIC PRESSURE gage/GYRO
SUCTION gage Check in green arc.
m. CABIN CLIMB indicator Check for de-
scent indication within approximately 10 -
15 seconds, then release test switch.
n. LEFT PNEU & ENVIRO BLEED AIR valve
o. Repeat steps i. through n. using the right
bleed air valve.
p. CABIN PRESS switch Set to pressure
q. CABIN ALT controller Reset as re-
r. Cabin pressurization RATE control Re-
set as required.
s. PNEU & ENVIRO BLEED AIR valve
switches (2) ON.
If windshield anti-ice is needed prior to takeoff,
use NORMAL setting for a minimum of 15 min-
utes prior to selecting HIGH temperature to pro-
vide adequate preheating and minimize effects
of thermal shock.
11. Windshield anti-ice As required.
Do not operate the weather radar set while per-
sonnel or combustible materials are within 18
feet of the antenna reflector. When the weather
radar set is operating, high-power radio frequen-
cy energy is emitted from the antenna reflector,
which can have harmful effects on the human
body and can ignite combustible materials. Do
not operate radar in congested.