King Air C90GTi, Руководство по подготовке пилотов

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ICE PROTECTION
SYSTEMS
DESCRIPTION AND
OPERATION
T h e r e a r e s e v e n p i l o t - c o n t r o l l e d a n t i -
ice/deice systems:
• Surface Deice System
• Propeller Deice System
• Windshield Anti-Ice System
• Engine Anti-Ice System
• Pitot Mast Heat
• Fuel Heat
• Stall War ning Anti-Ice
The air plane is equipped with a variety of
ice and rain protection systems that can be
utilized during operation under inclement
weather conditions. Electrical heating ele-
ments embedded in the windshield provide
adequate protection against the for mation
of ice, while air from the cabin heating sys-
tems prevents fogging, to ensure visibility
d u r i n g o p e r a t i o n u n d e r i c i n g c o n d i t i o n s .
Heavy-duty windshield wipers for both the
pilot and copilot provide fur ther visibility
during rainy flight and g round conditions.
Pneumatic deicer boots on the wings and on
the ver tical and horizontal stabilizers re-
m ove t h e f o r m a t i o n o f i c e d u r i n g f l i g h t .
Regulated bleed-air pressure and vacuum
are cycled to the pneumatic boots for the in-
flation-deflation cycle. The selector switch
that controls the system per mits automatic
single-cycle operation or manual operation.
Ice protection for the engine is provided by
an iner tial separation system utilizing an
electrical actuator. Should the main elec-
trical actuator motor fail, a standby actua-
tor motor is provided. The leading-edge lip
of the engine air inlet is continuously anti-
iced by engine exhaust air. The propellers are
protected against icing by electrother mal
boots on each blade that automatically cycle
to prevent the for mation of ice.
A heating element in both pitot masts pre-
ve n t s t h e p i t o t o p e n i n g s f r o m b e c o m i n g
c l og g e d w i t h i c e . T h e h e a t i n g e l e m e n t s
a r e c o n n e c t e d t o t h e a i r p l a n e e l e c t r i c a l
s y s t e m t h r o u g h t w o 5 - a m p e r e c i r c u i t -
b r e a ke r sw i t c h e s .
SURFACE DEICE SYSTEM
The leading edges of the wings and tail stabi-
lizers are protected against ice accumulation.
I n f l a t a bl e b o o t s o n t h e s e s u r f a c e s a r e i n -
f l a t e d wh e n n e c e s s a r y by p n e u m a t i c p r e s -
s u r e , w h i c h b r e a k s a w a y t h e i c e
a c c u m u l a t i o n , a n d a r e d e f l a t e d by p n e u -
m a t i c - d e r ive d va c u u m . T h e va c u u m i s a l -
way s s u p p l i e d wh i l e t h e b o o t s a r e n o t i n
u s e a n d a r e h e l d t i g h t ly a g a i n s t t h e a i r -
c r a f t s k i n .
N e v e r t a k e o f f o r l a n d w i t h t h e
boots inflated. Do not operate deice
boots when outside air temperature
(OAT) is below –40°C (–40°F).
There are f ive boots in total for this system.
One boot on the outboard section of each
w i n g , o n e o n e a c h s i d e o f t h e h o r i z o n t a l
stabilizer, and one on the vertical stabilizer.
T h e t h r e e - p o s i t i o n D E I C E C Y C L E S I N -
GLE–OFF– MANUAL switch in the ice pro-
tection g roup controls boot operation. The
switch is spring-loaded to the center OFF
position. When approximately 1/2 to 1 inch
of ice has accumulated, the switch must be
selected to the SINGLE cycle (up) position
and released. Pressure-regulated bleed air
f r o m t h e e n g i n e c o m p r e s s o r s s u p p ly a i r
t h r o u g h a d i s t r i b u t o r va l ve t o i n f l a t e t h e
wing boots. After an inflation period of 6
seconds, an electronic timer switches the
distributor to deflate the wing boots with
CAUTION
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
10-4
FOR TRAINING PURPOSES ONLY
10
ICE
AND
RAIN
PRO
TECTION