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the actuator reference pressure regulator and the servo
reference pressure regulator.
The actuator reference pressure regulator reduces the
pressure to a constant control pressure. Control pressure
then goes to chamber A and the nozzle.
The servo reference pressure regulator reduces the pressure to
a constant control pressure. Control pressure then goes to
chamber B of the servo, precooler control valve sensor, and
WTAI solenoid valve.
The control pressure in chamber A opens and closes the
precooler control valve. When pressure increases, the
precooler control valve moves towards close. When pressure
decreases, the precooler control valve moves towards open.
The control pressure in chamber B moves the lever on the
servo. When control pressure increases, the lever closes the
nozzle. When control pressure decreases, the lever opens the
nozzle.
The control pressure in chamber B decreases when the
precooler control valve sensor opens, or the WTAI solenoid
valve opens.
The precooler control valve sensor starts to open when the
temperature in the pneumatic duct is 390F and is full open at
440F. This decreases the pressure in chamber B. As pressure
in chamber B decreases, the lever on the servo opens the
nozzle. The open nozzle decreases pressure in chamber A and
the spring in the precooler control valve actuator moves the
valve to open. As the precooler control valve opens, a feedback
spring starts to move the lever to close the nozzle. This
prevents rapid movement of the precooler control valve.
The WTAI solenoid valve is open when the airplane is on the
ground and the wing thermal anti-ice system is on. This
decreases all the pressure in chamber B, and moves the lever
to open the nozzle. The open nozzle then decreases all the
pressure in chamber A. Then the spring in the actuator opens
the precooler control valve full open.
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-017, 019-099, 101-118, 201-999 36-12-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-12-00-220
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - FUNCTIONAL DESCRIPTION
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-017, 019-099, 101-118, 201-999 36-12-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-12-00-220
THIS PAGE IS INTENTIONALLY LEFT BLANK
36-13-00
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The pneumatic manifold has these purposes:
* Sends compressed air from the pneumatic sources to the
user systems
* Supplies a valve to isolate the manifold into two separate
systems (left and right)
* Supplies a connection for a ground source of pneumatic
power.
General Description
The pneumatic manifold ducts are made of strong, corrosionresistant,
light-weight tubing. The pneumatic ducts are
supported in tension.
An isolation valve in the center of the crossover duct divides the
pneumatic manifold into a left and right side. The right side of
the pneumatic manifold has these interfaces/features:
* Engine 2 bleed air system
* Engine 2 start system
* Ground pneumatic connector check valve
* Right air conditioning system
* Right wing thermal anti-ice system
* Hydraulic reservoir pressurization tap
* Isolation valve.
The left side of the pneumatic manifold has these interfaces/
features:
* Engine 1 bleed air system
* Engine 1 start system
* APU bleed air system
* Left air conditioning system
* Left wing thermal anti-ice system
* Hydraulic reservoir pressurization tap
* TAT probe, water pressurization system tap
GUN 018-099, 111-118
* Nitrogen gas generation system tap
GUN ALL
* Isolation valve.
Location
The manifold is in these areas of the airplane:
* Engine struts
* Wing leading edges, along the front spars
* Forward air conditioning bays below the center wing
(crossover duct)
* Keel beam between the air conditioning pack bays.
Controls and indications for the pneumatic manifold are on the
air conditioning bleed air controls panel.
PNEUMATIC - MANIFOLD SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 36-13-00
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D633A101-GUN Oct 10/2006
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