King Air C90GTi, Руководство по подготовке пилотов

Страница: 270 / 557

When the BLEED AIR VALVE switches on
the copilot’s left subpanel are OPEN (up),
the air mixture from the flow control units
enters the pressure vessel. While the air-
plane is on the g round, a left landing gear
s a f e t y s w i t c h - a c t u a t e d s o l e n o i d v a l v e
( F i g u r e 1 2 - 7 ) i n e a c h f l ow c o n t r o l u n i t
k e e p s t h e a m b i e n t a i r m o d u l a t i n g va l v e
c l o s e d, a l l ow i n g o n ly bl e e d a i r t o b e d e - livered into the pressure vessel. At lift-off,
the safety valve closes and the ambient air
shutoff solenoid valve in the left flow con-
trol unit opens; approximately 6 seconds
later, the solenoid in the right flow control
unit opens. Consequently, by increasing the
volume of airflow into the pressure vessel
in stages, excessive pressure b umps dur-
ing takeoff are avoided.
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
12-7
FOR TRAINING PURPOSES ONLY
12
PRESSURIZA
TION
LH GEAR
SAFETY
SWITCH
LH FLOW
CONTROL
PACKAGE
AMBIENT AIR
SHUTOFF VALVE
CABIN AIR TEMP
5A
CABIN AIR TEMP
5A
DN
UP
LH GEAR
SAFETY
SWITCH
PRESSURE
CONTROL
SWITCH
TEST
PRESS.
DUMP
DUMP POSITION
PRESS. POSITION
TEST POSITION
DN
UP
RH FLOW
CONTROL
PACKAGE
AMBIENT AIR
SHUTOFF VALVE
TIME
DELAY
PCB
DOOR SEAL
SOLENOID
(N.O.)
CABIN
PRESSURE
SAFETY
VALVE
(N.C.)
CABIN
PRESET
SOLENOID
(N.O.)
RAM AIR
DOOR
SOLENOID
Figure 12-7. Bleed Air Control (Pressurization and Pneumatics)