King Air C90GTi, Pilot Training Manual

Page: 246 / 557

ENVIRONMENTAL
SYSTEM
“Environmental System” refers to the de-
vices which control the pressure vessel’s en-
v i r o n m e n t . A l o n g w i t h i n s u r i n g t h e
circulation of air, this system controls tem-
perature by utilizing heating and cooling
devices as needed.
The environmental system consists of bleed-
air pressurization, heating and cooling sys-
t e m s a n d t h e i r a s s o c i a t e d c o n t r o l s . T h e
Beechcraft King Air series environmental
system (Figure 11-1) uses turbine engine
bleed air for cabin pressurization and cabin
heating. The air conditioning system, driven
by the electrical system, provides cool air to
the air plane cabin.
The ENVIRONMENTAL control section on
the copilot’s left subpanel (Figure 11-2) pro-
vides for automatic or manual control of the
system. This section contains all the major
controls of the environmental function:
• Bleed-air valve switches
• Vent blower control switch
• M a n u a l t e m p e r a t u r e s w i t c h f o r
control of the bypass valves in the air-
to-air heat exchangers
• Cabin-temperature-level control
• C a b i n t e m p e r a t u r e m o d e s e l e c t o r
switch for selecting automatic heating
or cooling, manual heating or cooling
• Electric heat control switch
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
11-3
FOR TRAINING PURPOSES ONLY
11
AIR
CONDITIONING
Figure 11-2. Environmental Group Switches and Knobs