King Air C90GTi, Руководство по подготовке пилотов

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WINDSHIELD WIPERS
Separate windshield wipers are mounted on
the pilot’s and copilot’s windshield. The dual
wipers are driven by a mechanism operated
by a single electric motor, all located forward
of the instr ument panel.
The windshield wiper control is located on
t h e ove r h e a d l i g h t c o n t r o l p a n e l ( Fi g u r e
10-9). It provides the wiper mechanism with
S L OW, FA S T, O F F, a n d PA R K p o s i t i o n s .
The wipers may be used either on the ground
or in flight, as required. The wipers must
not be operated on a dr y windshield. The
windshield wiper circuit breaker is on the
copilot’s right-side circuit-breaker panel
in the WEATHER g roup.
ENGINE ANTI-ICE SYSTEM
ENGINE ANTI-ICE SYSTEM an iner tial
va n e s y s t e m o f s e p a r a t o r s i s i n s t a l l e d o n
each engine to prevent ice, or other foreign
objects such as dust or g ravel, from enter-
ing the engine inlet plenum or ice accumu-
lating on the engine inlet screen. A movable
vane and a bypass door are closed (retracted)
for normal flying conditions (Figure 10-10).
At temperatures above +5ºC, the ice vane
and door should be in the retract position,
as ice for mation is unlikely.
When in icing conditions with the ice vane
in the extend position (Figure 10-11), the
ice vane is positioned to create a venturi ef-
fect and introduces a sudden tur n into the
engine. At the same time the bypass door in
the lower cowling at the aft end of the air
duct is open.
As the ice par ticles or water droplets enter
the air inlet, the airstream with these par ti-
cles is accelerated by the venturi effect. Due
to their g reater mass, and therefore g reater
momentum, the frozen moisture par ticles
accelerate past the screen area and are dis-
charged overboard through the bypass door.
The airstream, however, makes the sudden
tur n free of ice par ticles and enters the en-
gine through the inlet screen.
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
10-10
FOR TRAINING PURPOSES ONLY
10
ICE
AND
RAIN
PRO
TECTION
Figure 10-9. Windshield Wipers