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 C.  ENGINES WITH THE START BLEED VALVE DEFLECTOR; The bleed air is ducted through the valve and the air diffuser and dispersed against the deflector baffle which prevents hot air from blowing against the inside of the thrust reverser. When the start valve is closed the air pressure signal is cutoff allowing the bleed valve to close. The start bleed system has no significant adverse effects on start time and exhaust gas temperature (EGT).
 D.  ENGINES WITHOUT THE START BLEED VALVE DEFLECTOR; The bleed air is ducted through the valve and the air diffuser. When the start valve is closed the air pressure signal is cutoff allowing the bleed valve to close. The start bleed system has no significant adverse effects on start time and exhaust gas temperature (EGT).
 2.  5th-Stage Start Bleed Valve (Fig. 1)
___________________________
 A.  The 5th-stage start bleed valve is located on the left side of the HPC case at the 11 o'clock position. It is a pneumatically operated, normally closed valve which is opened when starter air pressure is applied to the signal port. At starter cut out, the valve is closed by spring force assisted by a 5th-stage pressure boost. This pressure boost assist will hold the valve shut in the case of a spring (or valve) failure.
 B.  ENGINES WITH THE START BLEED VALVE DEFLECTOR; An air diffuser is attached to the exit port of the bleed valve to reduce the velocity of the exiting bleed air. The air is discharged against the deflector baffle.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
A
SEE B
A

SEE A
FLANGE N
B
5TH STAGE START BLEED VALVE
AIR DIFFUSER
B
DEFLECTOR BAFFLE
FOR THE START
BLEED VALVE

AIR SIGNAL TUBE 1
FROM THE START EGT WIRE
BLEED VALVE HARNESS
TO THE START VALVE
FLANGE P HPC
FWD
A
1 ON LATER PRODUCTION ENGINES, THE BLEED VALVE DEFLECTOR WAS REMOVED 5th-Stage Start Bleed System Component Location Figure 1 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
5TH-STAGE START
BLEED VALVE

AIR DIFFUSER
DEFLECTOR BAFFLE FOR THE STARTBLEED VALVE

1

1
ON LATER PRODUCTION ENGINES, THE
BLEED VALVE DEFLECTOR WAS REMOVED

5th-Stage Start Bleed System Component Location Figure 1 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
STARTER
AIR SIGNAL TUBE
START
FROM THE START
VALVE
BLEED VALVE
FWD
B
STARTER AIR PRESSURE SIGNAL
SPRING
PISTON
5TH-STAGE PRESSURE BOOST
DISCHARGE INTO THE CORE CAVITY5TH-STAGE AIR
EXIT
PORT
VALVE BODY
VALVE SHOWN CLOSED
B-B

5th-Stage Start Bleed System Component Location Figure 1 (Sheet 3)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
　
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