King Air C90GTi, Руководство по подготовке пилотов

Страница: 224 / 557

vacuum, and a 4-second inflation begins in
the horizontal and ver tical stabilizer boots.
After the boots inflate and deflate, the cycle
i s c o m p l e t e a n d a l l b o o t s a r e a g a i n h e l d
t i g h t ly by va c u u m a g a i n s t t h e w i n g s a n d
h o r i z o n t a l s t a b i l i z e r. T h e s p r i n g - l o a d e d
sw i t c h m u s t b e s e l e c t e d u p a ga i n f o r a n -
other cycle to occur.
If the boots f ail to function sequentially,
they can be operated manually by position-
i n g t h e D E I C E C Y C L E S I N G L E – O F F –
M A N UA L sw i t c h t o M A N UA L . P r e s s i n g
and holding the switch to MANUAL inflates
a l l t h e b o o t s s i m u l t a n e o u s l y. W h e n t h e
switch is released, it retur ns to the spring-
loaded OFF position, and each boot is de-
flated and held by vacuum.
Each engine supplies a common bleed-air
manifold. To ensure the operation of the sys-
t e m i f o n e e n g i n e i s i n o p e r a t ive , a c h e c k
valve is in the bleed-air line from each en-
gine to prevent loss of pressure through the
compressor of the inoperative engine.
A single circuit breaker on the copilot side
panel, receiving power from the CENTER
bus, supplies the electrical operation of both
boot systems. The boots operate most ef-
fectively when approximately 1/2 to 1 inch
of ice has for med. Ver y thin ice cracks and
can cling to the boots and/or move aft onto
unprotected areas. When operated manu-
ally, the boots cannot be left inflated longer
than necessary to eliminate the ice, as a new
l aye r o f i c e c a n b eg i n t o f o r m o n t h e ex -
panded boots and become unremovable. If
o n e e n g i n e i s i n o p e r a t ive , t h e l o s s o f i t s
pneumatic pressure does not affect boot op-
eration. The boot system requires electrical
power to inflate the boots in either single-
cycle or manual operation. If power is lost,
the vacuum holds them tightly against the
leading edge.
PROPELLER DEICE SYSTEM
The propeller electric deice system includes:
an electrically heated boot for each propeller
blade, slip rings, brush assemblies, timer, on-
off switch, and an ammeter (Figure 10-3).
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
10-5
FOR TRAINING PURPOSES ONLY
10
ICE
AND
RAIN
PRO
TECTION
LEFT PROP RIGHT PROP
F D E C G B
PROP TIMER
PROP AMMETER
5A
ELECTRIC
HEAT
LOCKOUT
CIRCUIT
Figure 10-3. Propeller Electric Deice System