21-25-02
 ALL  ú ú 04 Page 411 ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 424-044
 (2)  
Push the prefilter through the forward face of the filter holder.

 (a)  
Push the filter against the high efficiency filter.

 S 414-045
 (3)  
Put the cover assembly on the filter holder.

 S 414-046

 (4)  
Tighten the 1/4-turn studs (20 locations) to hold the cover in position.

 E.
Install the Right Recirculation Filters.

 S 424-050
 (1)  
Put the high efficiency filter through the forward face of the filter holder.

 (a)  
Push the filter outboard (away from the mix manifold).

 S 424-051
 (2)  
Push the prefilter through the forward face of the filter holder.

 (a)  
Push the filter against the high efficiency filter.

 S 414-052
 (3)  
Put the top retainer on the filter holder.

 S 414-053

 (4)
Install washers and screws to hold the top retainer in position.

 F.
Put the Airplane Back to Its Usual Configuration

 S 864-055
 (1)  
Remove the DO-NOT-OPERATE tags from the L and R PACK selectors, on the P5 panel.

 S 864-054

 (2)  
Remove the DO-NOT-OPERATE tag from the applicable RECIRC FAN switch/light, on the P5 panel.

 S 414-080

 (3)  
Install the access panel for the right recirculation filter in the aft bulkhead of the forward cargo compartment.

 (4)  
Close the No. 1 Cargo Door, 821 (AMM 06-46-00/201).

 S 864-078

 (5)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 414-079
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-25-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 RECIRCULATION AIR CHECK VALVE - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  The recirculation system uses two check valves to let the air flow into, but not out of, the mix manifold. The check valve for the right recirculation system is installed immediately to the right of the mix manifold. The check valve for the left recirculation system is installed in the forward end of the left sidewall of the forward cargo compartment.
 B.  This procedure has instructions to remove and install the check valves for the recirculation system.
 TASK 21-25-03-004-001
 2.  Remove the Recirculation Air Check Valve (Fig. 401)________________________________________
 A.  References
 (1)  
AMM 06-46-00/201, Entry, Service and Cargo Doors Access Doors and Panels

 (2)  
AMM 24-22-00/201, Electric Power Control

 (3)  
AMM 25-50-02/401, Sidewall Lining Panels

 (4)  
AMM 25-50-03/401, Bulkhead Lining

 B.  
Access

 (1)  
Location Zones 121 Forward cargo compartment (Left) 126 Area aft of forward cargo comaprtment (Right)

 C.  
Prepare for the Removal

 S 864-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-003

 (2)  
Turn the L and R PACK selectors, on the pilots overhead panel, P5, to the OFF position.

 (a)  
Make sure the PACK OFF lights come on.

 (b)  
Put a DO-NOT-OPERATE tag on the selectors.

 S 864-004
 (3)  
Push the applicable (L or R) RECIRC FAN switch-light, on the P5 panel, to the off position.

 (a)  
Make sure the INOP light comes on.

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 21-25-03
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