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MANUAL PRESS Switch and MANUAL Knob ......................... 6-31
EMER DEPRESS Switch.................................................................. 6-31
Cabin Pressure Control Diagram (Figure 6-11) ........................... 6-32
Pressurization Warning System ........................................................ 6-33
Pilot’s Manual
PM-126A 6-1
SECTION VI
ANTI-ICE &
ENVIRONMENTAL
BLEED AIR SUPPLY
Engine bleed air is used extensively for anti-icing and cabin environmental
control. The source of this air is through low- and high-pressure
ports on each engine compressor. High pressure (HP) or low pressure
(LP) air is automatically supplied on an as-needed basis to meet pressurization
requirements. The bleed air obtained from the engine’s HP
and LP ports is routed through shutoff and regulator valves. The bleed
air is then ducted into either the anti-ice system or the Environmental
Control Unit (ECU) or PACK. The PACK conditions the air for the cabin
and cockpit distribution systems.
Shutoff valves and check valves are installed in the tailcone plumbing
to control the bleed air from the left and right engines. In addition to the
plumbing, the system includes control switches and incorporates an
overheat, overpressurization and leak detection/warning system. A
small amount of high-pressure bleed air is also used to pressurize the
hydraulic reservoir described in Section 3, this manual.
The auxiliary power unit provides an additional bleed air source to operate
the PACK when the aircraft engines are not running. The auxiliary
power unit is designed for ground use only.
BLEED AIR SWITCHES
The L and R BLEED, and EMER PRESS switches, located on the PRESSURIZATION
panel, control the respective left and right bleed-air
shutoff valves, and the left and right emergency pressurization valves.
The EMER PRESS switch is dependent on the L and R BLEED switches.
Both L and R BLEED switches must be in the On position (OFF not illuminated)
in order for both emergency pressurization valves to open
with activation of the EMER PRESS switch. However, in the event of a
L or R BLEED circuit breaker failure, it is possible to have bleed air supplied
through an emergency pressurization valve of one engine and
through the normal ducting of the other engine.
Pilot’s Manual
6-2 PM-126A
HP SHUTOFF VALVES
A pressure sensor within the HP ducting sends a signal to the ECS controller
which drives the HP shutoff valves according to altitude and
thrust lever angle.
The following CAS illumination is specific to the HP shutoff valves:
PYLON OVERHEAT
Four temperature sensors around the pylon structure provide for overheat
indication.
The following CAS illumination is specific to pylon overheat detection:
TAILCONE LEAK DETECTION
Tailcone sensing elements are installed along the ducting between the
left and right high-pressure shutoff valves including the pack bi-level
pressure shutoff valve, ECS pressure valves and ECS check valves. The
loop-type elements detect elevated tailcone temperatures caused by a
leak in the bleed-air ducting.
If a leak occurs between the high pressure shutoff valve and the ECS
check valve, the corresponding BLEED AIR LEAK red CAS and CWP
will illuminate. This CAS will also occur if a leak is detected between
the ECS check valve and the pack bi-level pressure shutoff valve. The
tailcone overheat detection system operates on 28-vdc supplied from
the left essential bus.
The following CAS illumination is specific to tailcone overheat
detection:
Illumination of the BLEED AIR LEAK red CAS will
cause the APU to shut down.
CAS Color Description
BLEED OVHT Amber Bleed air temperature in the associated (L or
R) bleed air duct is excessive.
CAS Color Description
ENG PYLON OVHT Red The associated (L or R) engine pylon area is
overheated.
CAS Color Description
BLEED AIR LEAK Red A leak is detected in the associated (L or R)
bleed air ducting (tailcone).
NOTE
Pilot’s Manual
PM-126A 6-3
BLEED AIR SYSTEM SCHEMATIC
Figure 6-1
CPCS
RIGHT
CH
LEFT
CH
ON
OFF OFF
L BLEED
28 VDC
COCKPIT
RH CABIN
LH CABIN
COCKPIT/
CABIN
GASPERS
ACM
WING
ANTI-ICE
STAB
ANTI-ICE
APU
ON
OFF
ON
PACK
HI FLOW
ECS SOV
PACK
BI-LEVEL
PRSOV
HP BLEED PORTS
LP BLEED PORT
ECS SOV
HP SOV
NAC A/I
VALVE
NAC A/I
VALVE
HP SOV
LP BLEED PORT
HP BLEED PORTS
　
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