Engine Bleed Air System
The engine bleed air system is designed to ensure the following functions:
-
to regulate the bleed air from the engine,
-
to ensure a controlled airflow in the cabin,
-
to adjust the bleed air temperature for cabin heating.
To Regulate the Bleed Air from the Engine
The engine bleed air system operates from both the P2.5 (compressor inter-stage)
or P3 (compressor discharge) engine bleed ports.
The system normaly operates on the P2.5 port, through the Flow Control Shut-Off
Valve (FCSOV), as long as the bleed flow rate demand is met by this port.
If this demand is not met, the system opens the Shut-Off Valve (SOV) on the P3
port, and the Bleed Ejector Valve (BEV) adjusts the bleed flow from the P3 port
and mixes it with the bleed flow from the P2.5 port in order to meet the demand.
The BEV, the FCSOV, and the SOV are commanded by the Bleed Flow Controller.
Regarding the bleed status, two messages can be displayed on the Single Engine
Indicator – see
-
When the bleed air flow on the P2.5 port exceeds 7 pounds per minutes,
P2.5 HI
is displayed.
-
When the P3 port is open,
P3
is displayed.
NOTE
When either
P2.5 HI
or
P3
is displayed, the FADEC may command a decrease
of torque to maintain ITT within engine limitations.
Figure 7.10.2 - Bleed Status Display
TRQ
NG
%
96.8
ITT
°C
733
PROP
RPM
1925
92
%
P2.5 HI
OIL
123
PSI
81
°C
TRQ
NG
%
96.8
ITT
°C
733
PROP
RPM
1925
92
%
P3
OIL
123
PSI
81
°C
C
4
3
4
2
8
0
0
A
A
A
G
M
A
8
0
0
0
Section 7
Description
Pilot's Information Manual
PIM TBM 960 - Edition 0
Rev. 02
Page 7.10.5
PIM - DO NOT USE FOR FLIGHT OPERATIONS
