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 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. GUN 001-004 WITHOUT SB 21-51 ú

 21-21-01
 ú ú 13 Page 402 ú Mar 20/97
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A

757
MAINTENANCE MANUAL

SEE  A 
BUTTERFLY CHECK VALVE 
MIX MANIFOLD 
BYPASS DUCT 
CLAMP 
GASKET 
WASHER 
BOLT 
(EXAMPLE) 
SWING 
CHECK VALVE  RUBBER SLEEVE 
BOLT GROUND 
WASHER  CONNECTOR DUCT 
(EXAMPLE) 
GASKET 
AIRPLANE 
SKIN 
GROUND 
CONNECTOR 
SPACER 
FAIRING 
A 
Conditioned Air Check Valve Installation 
Figure 401A 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 GUN 001-004 WITH SB 21-51,  ú 21-21-01
 AND GUN 005-999  ú ú 14 Page 403 ú Jun 20/93
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757 MAINTENANCE MANUAL
 (b)  Put a DO-NOT-OPERATE tag on the selectors.
 S 014-003
 (3)  
Open the No. 1 cargo door, 821 (AMM 06-46-00/201).

 S 014-004

 (4)  
Remove the aft bulkhead lining of the forward cargo compartment (AMM 25-50-03/401).

 S 014-060

 (5)  
Remove the mix manifold.

 (a)  
Remove the filter duct from the bottom section of the mix manifold.

 (b)  
Remove the filter housing.

 (c)  
Remove the forward muffler from the top section of the mix manifold.

 (d)  
Remove the top section of the mix manifold.

 (e)  
Remove the bottom section of the mix manifold from the ground service duct.

 (f)  
Remove the gasket from the top section of the mix manifold.

 D.
Remove the check valve assembly

 S 034-005
 (1)  
Remove the ground connector duct.

 (a)  
Remove the bolts from the lower flange of the ground connector duct.

 (b)  
Remove the bolts from the top flange of the ground connector duct.

 (c)  
GUN 001-004 WITH SB 21-51 AND GUN 005-999; disconnect the bypass duct from the ground connector duct. 1) Loosen the clamp on the ground connector duct. 2) Move the rubber sleeve and the clamp away from the ground

 connector duct.

 (d)  
Remove the ground connector duct.

 S 034-006
 (2)  
Remove the gasket from the top flange.

 S 024-019

 (3)  
GUN 001-004 WITH SB 21-51 AND GUN 005-999;
 remove the butterfly check valve.

 S 024-023

 (4)  
Remove the check valve from the inside of the ground connector duct

 (a)
Remove the screws from the check valve hinge.

 (b)
Pull the check valve out of the ground connector duct.

 TASK 21-21-01-404-024
 3.  Install the Check Valve For The Conditioned Air (Fig. 401)_______________________________________________
 A. Consumable Materials
 (1)  A00027 - Adhesive - Misc, BAC5010, Type 60
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-21-01
 ALL  ú ú 13 Page 404 ú May 20/98
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A
757
MAINTENANCE MANUAL

 (2)  
A00247 - Sealant - Chromate Type, BMS5-95

 (3)  
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261

 B.
References

 (1)  
AMM 06-41-00/201, Fuselage (Major Zones 100 and 200) Access Doors and Panels

 (2)  
AMM 06-46-00/201, Entry, Service and Cargo Doors (Major Zone 800) Access Doors and Panels

 (3)  
　
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