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C.  ENGINES WITHOUT 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.
 3.  Operation
_________
 A.  During engine start air pressure is ducted to the start valve and the starter is engaged (start valve open). After start valve opening air pressure is applied to a pressure sensing port just downstream of the valve which directs air to the signal port on the start bleed valve, causing it to open. This allows engine core airflow to exit the HPC for improved stability.
 B.  ENGINES WITH THE START BLEED VALVE DEFLECTOR; Bleed air passes through the valve, then the diffuser, and is deflected against a baffle where it mixes with engine compartment air. The air discharges overboard through the gap between the aft end of the thrust reverser and the exhaust sleeve.
 C.  ENGINES WITHOUT THE START BLEED VALVE DEFLECTOR; Bleed air passes through the valve and the diffuser where it mixes with engine compartment air. The air discharges overboard through the gap between the aft end of the thrust reverser and the exhaust sleeve.
 D.  When the starter is disengaged, the start valve closes cutting off the air signal to the bleed valve. Spring pressure aided by a 5th-stage pressure boost traveling through a small orifice to the spring side of the piston sleeve closes the bleed valve and holds it shut during normal engine operation.
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 75-34-00
 ALL  ú ú C01 Page 5 ú Jul 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
5TH-STAGE START BLEED SYSTEM - ADJUSTMENT/TEST
______________________________________________
 1.  General_______
 A.  This procedure contains an operational test which makes sure the
 5th-stage start bleed system is serviceable.

 B.  It is necessary to dry motor the engine during this procedure.
 TASK 75-34-00-715-001-C00
 2.  Operational Test________________
 A.  References
 (1)  
AMM 71-00-00/201, Power Plant

 (2)  
AMM 75-34-01/401, 5th-stage Start Bleed Valve

 (3)  
AMM 78-31-00/201, Thrust Reverser

 B.  Access
 (1)  
Location Zones
 506 Engine No. 1
 606 Engine No. 2

 (2)  
Access Panels 5739L/5738L Engine No. 1 - Thrust Reverser Half 5839R/5838R Engine No. 2 - Thrust Reverser Half

 C.  Procedure (Fig. 501)
 S 015-002-C00
 (1)  Open the left thrust reverser half (AMM 78-31-00/201).
 S 865-003-C00
 WARNING: MAKE SURE THAT THE PERSONS ON THE GROUND CAN SPEAK TO THE
_______ PERSONS IN THE FLIGHT COMPARTMENT CAN TALK TO EACH OTHER. THE PERSONS ON THE GROUND WILL BE IN THE FAN AIRFLOW DURING THE ENGINE DRY MOTOR PROCEDURE. IF THE PERSONS ON THE GROUND CANNOT SPEAK TO THE PERSONS IN THE FLIGHT COMPARTMENT, INJURY CAN OCCUR.
 MAKE SURE THAT THE COWL/REVERSER ACTUATOR IS IN THE LOCKED POSITION. IF THE COWL/REVERSER IS NOT IN THE LOCKED POSITION, AN ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 USE AMM 71-00-00/201 TO OPERATE THE POWER PLANT. IF YOU DO NOT USE THIS PROCEDURE, YOU CAN CAUSE DAMAGE TO EQUIPMENT OR INJURY TO PERSONS.
 (2)  Use the Power Plant Dry-Motor procedure to motor the engine (AMM 71-00-00/201).
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 75-34-00
 ALL  ú ú C01 Page 501 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
5TH-STAGE START BLEED VALVE
AIR DIFFUSER
AIR SIGNAL TUBE FROM THE START BLEED VALVE
DEFLECTOR BAFFLE FOR THE START BLEED VALVE
1 FWD
A
1 ON LATER PRODUCTION ENGINES, THE BLEED VALVE DEFLECTOR WAS REMOVED
5th-Stage Start Bleed System Operational Test Figure 501
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