Air Conditioning And Pressurization; Engine Bleed Air System - Daher-Socata TBM 900 Pilot's Information Manual

PILOT'S OPERATING HANDBOOK

7.9 - AIR CONDITIONING AND PRESSURIZATION

The airplane is equipped with a Global Air System (GAS), which ensures air conditioning and pressurization
(Figure 7.9.1).
GAS controls are located on "ECS" panel at the L.H. side of the R.H. side control wheel and above the arm rest of
the L.H. passenger's seat (Figure 7.9.2).
The system is monitored through CAS messages appearing on the GDU 1500 MFD.
A list of abbreviations used in this chapter is given in Figure 7.9.1.
The GAS is composed of 3 main sub-systems :
-

Engine Bleed Air System,

- Dual zones Environmental Control System, including heating and cooling functions,
- Cabin Pressurization Control System.
These 3 sub-systems are managed by a single digital controller (GASC), which receives information coming from :
- the sensors set in the sub-systems,
- the human interfaces set in the airplane.
The GASC elaborates the proper commands to the sub-system actuators and indication or warning elements.
ENGINE BLEED AIR SYSTEM
The Engine Bleed Air System is designed to ensure the following functions :
- to bleed air from the engine,
- to ensure a controlled airflow in the cabin,
- to adjust the temperature of the bleed air at a compatible level, in order to control the cabin temperature in
heating and cooling modes.
The "BLEED" switch allows to switch on the Engine Bleed Air System provided that the engine runs. The Ground
Fan (GF) runs until takeoff, when "BLEED" switch is set to AUTO, and the
The "BLEED" switch is fitted with a blocking device between AUTO and OFF/RST positions preventing the
operator from a non expected setting of "BLEED" switch to OFF/RST position.
"BLEED TEMP"
The
conditions), when the "BLEED" switch is set to AUTO and when the Bleed Temperature switch (BTSW) or the
Overheat Thermal Switch (OTSW) triggers on.
"BLEED OFF"
The
conditions), when the engine is running and the Flow Control Shut Off Valve (FCSOV) is closed.
To reactivate the system, set "BLEED" switch to OFF/RST, then to AUTO.
Edition 0 -- October 31, 2013
Rev. 1
CAS message appears in the GDU 1500 MFD "CAS" window (in display normal
CAS message appears in the GDU 1500 MFD "CAS" window (in display normal
NOTE
"MAIN GEN"
SECTION 7
DESCRIPTION
CAS message is OFF.
Page 7.9.1