NOTE: It can be necessary to loosen the bolts that attach the strap
____ across the air diffuser to make the valve removal easier.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
FLANGE N
BSEE BLEED VALVE 5TH-STAGE START
HOLD DOWN STRAP AIR DIFFUSER
1 BLEED VALVE FOR THE START DEFLECTOR BAFFLE BLEED VALVE FROM THE START AIR SIGNAL TUBE
FLANGE P
1 FWD Figure 401 (Sheet 1) 5th-Stage Start Bleed Valve Installation A ON LATER PRODUCTION ENGINES, THE BLEED VALVE DEFLECTOR WAS REMOVED
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
JAMNUT ELBOW
V-BAND CLAMP METAL GASKET AIR INLET PORT BLEED AIR INLET AIR TUBE FOR 5TH-STAGE PORT SIGNAL B-NUT O-RING 5TH-STAGE START BLEED VALVE AIR OUTLET PORT
(2 LOCATIONS) BOLT V-BAND CLAMP METAL GASKET
AIR DIFFUSER HOLD DOWN STRAP AIR DIFFUSER
B
5th-Stage Start Bleed Valve Installation
Figure 401 (Sheet 2)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
TASK 75-34-01-404-008-C00
3. Install the 5th-Stage Start Bleed Valve
_______________________________________
A. Consumable Materials
(1) G02353, Lubricant, (CP2854) Petrolatum - VV-P-236
B. References
(1)
AMM 70-20-02/201, V-band Clamps
(2)
AMM 78-31-00/201, Thrust Reversers
C. 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
D. Procedure (Fig. 401)
S 434-009-C00
(1)
Put a new metal gasket on the air inlet port of the bleed valve.
S 424-010-C00
(2)
ENGINES WITHOUT CFMI SB 72-426; Install, but do not tighten, the valve on the inlet air tube and attach it with a V-band clamp.
NOTE: The valve is installed with the starter air signal port
____ pointed out from the engine, but turned 25-30 degrees from the valve center line in the clockwise direction.
S 424-020-C00
(3) ENGINES WITH CFMI SB 72-426; Install, but do not tighten, the valve on the inlet air tube and attach it with a V-band clamp and self-locking nut.
NOTE: The valve is installed with the starter air signal port
____ pointed out from the engine, but turned 25-30 degrees from the valve center line in the clockwise direction.
S 434-011-C00
(4)
Install the new metal gasket between the bleed valve and air diffuser.
S 434-012-C00
(5)
ENGINES WITHOUT CFMI SB 72-426; Attach the bleed valve to the air diffuser with a V-band clamp.
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