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A
737-300/400/500MAINTENANCE MANUAL
 NOTE: The troubleshooting for "DUAL BLEED" indication failures are
____
 found in AMM 49-00-00/101.

 NOTE: If the APU is started before the engines are shut down, the
____ PRSOV may remain open. If the sound of air escaping from the engines is heard, this may indicate a problem with the high stage valve or regulator.
 Figure 109 Split Duct Pressure. The Engine Was The Bleed Source.
 4.  Special Fittings________________
 A.  Some of the fault isolation procedures require the use of MS-6, unions (special fittings). These special union fittings are typically not available commercially as a one-piece unit. However, they can be made into a one-piece unit with two standard fittings welded together.
 _________________________________________________________________________ |Standard Fitting|Sample Part Number| Description
_________________________________________________________________________| |AN-4 (male) | AN815-4J |AN-4 (male) to AN-4 (male), Union | |MS-6 (male) | MS21902-6R |MS-6 (male) to MS-6 (male), Union | |MS-6 (female) | BACE21BT0606JN |MS-6 (male) to MS-6 (female), Elbow|
_________________________________________________________________________
 B.  The AN-4 (male) side of the standard fitting typically connects to the test hose. The MS-6 (female) side of the standard fitting typically connects to a pneumatic system component. The MS-6 (male) side of the standard fitting typically connects to a sense line which already has a MS-6 (female) fitting.
 C.  The MS-6, male-female union can be made into a one-piece unit with an AN-4 (male) standard fitting welded to a MS-6 (female) standard fitting.
 D.  The MS-6, male-male union can be made into a one-piece unit with an AN-4 (male) standard fitting welded to a MS-6 (male) standard fitting.
 E.  A set of three male-to-female union fittings and three male-to-male union fittings will form a complete set of special fittings that are needed to do the engine bleed air distribution system troubleshooting procedures.
 5.  Alternate Troubleshooting Procedures____________________________________
 NOTE: An additional procedure for isolating a faulty component is
____ located at AMM 36-11-05/601. This procedure uses a portable valve actuating test set to isolate faulty components of the bleed air system.
 A.  The Engine Bleed Air Distribution System directs high temperature compressed air from the engine bleeds to the air conditioning system, the engine starting system, the thermal anti-icing system, the hydraulic system, and the potable water system. The system consists of pressure regulating and shutoff valves (PRSOV), high stage valves, bleed air regulators, high stage regulators, an isolation valve, check valves, temperature sensing switches and associated ducting.
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A 737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL

AND SHUTOFF VALVE (PRSOV)
LEFT VIEW
Engine Bleed Air Distribution System - Component Location
Figure 101 (Sheet 1)

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A55380
A 737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL 
VALVE SENSOR 
OVERHEAT SWITCH 490`F  VALVE (PRSOV) REGULATOR PRESSURE AND SHUTOFF  HIGH 
STAGE 
REGULATOR 

FWD 9TH-STAGE MANIFOLD  VALVE STAGE HIGH  REGULATOR BLEED AIR 
RIGHT VIEW 

Engine Bleed Air Distribution System - Component Location Figure 101 (Sheet 2)
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