**ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
When the HP bleed valve is closed, air is directly bled from the IP stage through an IP bleed check valve (7110HM), fitted with two flappers. When the HP bleed valve is open, the HP stage pressure is admitted into the pneumatic ducting and closes the IP bleed check valve. Air is then bled from the HP stage only. The HP bleed valve operates pneumatically and is connected by a sense line to a bleed pressure regulator valve (4001HA).
R 1EFF : ALL 1 36-11-00Page 41 1 1 Aug 01/05 1 1 1CES 1
IP Bleed Check Valve Figure 007
R 1EFF : 1 1 1CES ALL 1 111 36-11-00 Page 42 Aug 01/05
INTENTIONALLY BLANK
R 1 1
36-11-00Page 43
1 1 Aug 01/05 1 1 1CES 1
Sense Line Routing - Engine and Pylon
Figure 008 (SHEET 1)
R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 36-11-00Page 44 1301-399, 1Aug 01/05 1 1 1CES 1
Sense Line Routing - Engine and Pylon
Figure 008 (SHEET 2)
R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 36-11-00Page 45 1301-399, 1Aug 01/05 1 1 1CES 1
Sense Line Routing - Engine and Pylon
Figure 008A (SHEET 1)
R 1EFF : 151-199, 401-499, 1 36-11-00Page 46 1 1 Aug 01/05 1 1 1CES 1
Sense Line Routing - Engine and Pylon
Figure 008A (SHEET 2)
R 1EFF : 151-199, 401-499, 1 36-11-00Page 47 1 1 Aug 01/05 1 1 1CES 1R **ON A/C 151-199, 401-499,
When the HP bleed valve is closed, air is directly bled from the IP stage through an IP bleed check valve (7110HM), fitted with two flappers. When the HP bleed valve is open, the HP stage pressure is admitted into the pneumatic ducting and closes the IP bleed check valve. Air is then bled from the HP stage only. The HP bleed valve operates pneumatically and is connected by a sense line to a bleed pressure regulator valve (4001HA) and to a HP bleed override solenoid (11HA).
**ON A/C ALL
The bleed pressure regulator valve is installed in the duct downstream of the IP bleed check valve and the HP bleed valve . The bleed pressure regulator valve also operates pneumatically but opening and closing can be controlled by a bleed pressure regulator valve control solenoid (10HA). The solenoid is installed in the duct downstream of the bleed air precooler exchanger (7150HM). The solenoid controls the bleed pressure regulator valve which controls the HP bleed valve at the same time.
R **ON A/C 151-199, 401-499,
During cruise with normal bleed condition, the solenoid (11HA) is energized. This causes the solenoid opens to ambient the HPV PRV coupling sense line which lets the HPV close pneumatically. It avoid a permanent HP bleed due to low IP engine pressures.
**ON A/C ALL
Downstream of the PRV an overpressure valve (OPV) (5HA) is installed to protect the pneumatic system against damage if overpressure occurs. To keep the temperature within the limits, a fan air valve (FAV) (9HA) is installed in the cooling air duct which supplies fan air to the precooler exchanger . The FAV operates pneumatically and is connected by a sense line to a fan air valve control thermostat (7170HM). The thermostat is installed downstream of the precooler exchanger. Two pressure transducers are installed on a bracket adjacent to the precooler exchanger. One pressure transducer (7HA) is connected with a sense line to the pneumatic duct downstream of the HP bleed valve , the other (8HA) is connected with a sense line to the pneumatic duct downstream of the PRV. An exchanger outlet temperature sensor (6HA) is installed in the elbow of the pneumatic duct in the pylon downstream of the precooler exchanger .
Both pressure transducers are connected to the bleed air monitoring
computers (BMC) by an electrical cable.
Bleed air at controlled pressure and temperature is supplied through
insulated ducts to the user as specified in 36-00-00.
4. Component Description
_____________________
A. High Pressure Bleed Valve.
**ON A/C 001-003, 051-054,
(Ref. Fig. 009)
R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399, 401-499,
(Ref. Fig. 009A)
**ON A/C ALL
(1) The HP Bleed Valve is a 4 in. dia. butterfly-type valve which operates as a shut-off and pressure regulating valve. The HP bleed valve is normally spring-loaded closed in the absence of upstream pressure. A minimum pressure of 8 psig is necessary to open the valve. The HP bleed valve pneumatically limits the downstream static pressure to 36 plus or minus 3 psig. It closes fully pneumatically when the upstream static pressure reaches 100 plus or minus 5 psig. A pneumatic sense line connects the HP bleed valve with the bleed pressure regulator valve (PRV) in order to make sure that the HP bleed valve will close when bleed pressure regulator valve is controlled closed.
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