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See the ice and rain chapter for more information on the WTAI
solenoid valve (CHAPTER 30).
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 36-12-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-12-00-216
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - INTRODUCTION
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 36-12-00
Page 3
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-12-00-216
Purpose
The precooler cools engine bleed air before it goes to the
pneumatic manifold.
Physical Description
The precooler is an air to air heat exchanger.
Location
The precooler is on the top of the engine high pressure
compressor case.
Functional Description
The precooler supplies a large surface area for efficient heat
transfer from the bleed air to the fan air (heat sink).
As the engine bleed air moves through the precooler, the bleed
air gives up heat to the walls of the precooler. The walls are
made of plates and fins. Engine fan air that goes through the
precooler on the other side of the walls, removes the heat and
carries it away. Heat transfer goes from the bleed air, to the
precooler walls, to the fan air. The fan air then flows over the
engine case and overboard through the case vents.
A sense line connection connects to the pressure regulating
and shutoff valve and the high stage regulator. See the engine
bleed air section for more information on the pressure
regulating and shutoff valve and high stage regulator
(SECTION 36-11).
Training Information Point
The precooler uses narrow passages with thin walls and
cooling fins for efficient heat exchange. Contamination or
obstruction of the precooler passages decreases or prevents
airflow and heat transfer. Keep the precooler clean for
maximum performance.
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - PRECOOLER
EFFECTIVITY
GUN ALL 36-12-00
Page 4
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-12-00-217
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - PRECOOLER
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - PRECOOLER
EFFECTIVITY
GUN ALL 36-12-00
Page 5
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-12-00-217
Purpose
The precooler control valve controls the flow of fan air to the
precooler.
Physical Description
The precooler control valve is a spring-loaded open butterfly
valve. It is pneumatically controlled and actuated valve. These
are the parts of the precooler control valve.
* Manual override and position indicator
* Sense line to precooler control valve sensor
* Sense line to wing thermal anti-ice solenoid valve
* Supply pressure line (from interstage manifold)
* Actuator.
Location
The precooler control valve is on top of the engine forward of
the precooler.
Training Information Point
The precooler control valve has a manual override and position
indicator. The override is used to verify the valve is spring
loaded open.
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - PRECOOLER CONTROL VALVE
EFFECTIVITY
GUN 001-017, 019-099, 101-118, 201-999 36-12-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-12-00-218
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - PRECOOLER CONTROL VALVE
PNEUMATIC - BLEED AIR PRECOOLER SYSTEM - PRECOOLER CONTROL VALVE
EFFECTIVITY
GUN 001-017, 019-099, 101-118, 201-999 36-12-00
Page 7
D633A101-GUN Oct 10/2006
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-12-00-218
Purpose
The precooler control valve sensor 390F (199C) controls the
movement of the precooler control valve.
Physical Description
The precooler control valve sensor is a bleed-off thermostat.
The precooler control valve sensor 390F (199C) has these parts:
* Ball valve assembly
* Sense line connection
* Mounting flange with indexing pin
* Shielded sensor section.
Location
The sensor is in the engine bleed air strut duct. Access is
　
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