757
MAINTENANCE MANUAL

3. FLEX DUCTS
RECIRCULATION AIR CHECK VALVE

Recirculation Air Check Valve Installation
Figure 401

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757
MAINTENANCE MANUAL

 (b)  Put a DO-NOT-OPERATE tag on the switch-light.
 S 864-034
 (4)  
Remove electrical power (AMM 24-22-00/201).

 S 014-008

 (5)  
To remove the right check valve, remove the access panel for the right recirculation filter.

 NOTE: The access panel is on the aft bulkhead of the forward cargo
____
 compartment.

 S 014-009
 (6)  
To remove the left check valve, remove the left sidewall lining panel, approximately 5-6 feet (1.5-2.0 meters) aft of the forward end of the forward cargo compartment (AMM 25-50-02/401).

 D.
Remove the Check Valve

 S 034-012
 (1)  
Remove the clamps from the check valve (4 locations).

 S 034-013

 (2)  
Move the flexible ducts away from the check valve.

 S 024-014

 (3)  
Remove the check valve.

 S 434-015

 (4)  
Put a cover on the duct openings.

 TASK 21-25-03-404-016
 3. Install the Recirculation Air Check Valve (Fig. 401)
_________________________________________
 A. Parts
 (1)  Refer to the Airplane Illustrated Parts Catalog (AIPC) for the numbers and effectivities of the items in this table:
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757 MAINTENANCE MANUAL
 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Clamp (Right Side) | 21-25-01 | 10 | 135J | | | 2 | Check Valve (Right Side) | | | 145J | | | 3 | Hose (Right Side) | | | 140 | | 401 | 1 | Clamp (Left Side) | 21-25-05 | 01 | 85 | | | 2 | Check Valve (Left Side) | | | 100 | | | 3 | Flexible Hose (Left Side) | | | 95 | 2........…......…...................................…...........….......…......1
 B. 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

 C.
Access

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

 D.
Install the Check Valve

 S 034-017
 (1)  
Remove the covers from the duct openings.

 S 424-018

 (2)  
Put the check valve into position in the ducts.

 (a)  
Make sure the flow arrow points to the mix manifold.

 S 434-019
 (3)  
Move the flexible ducts on to the check valve.

 (4)  
Install the clamps on the check valve (4 locations).

 S 434-021

 (5)
Tighten the screw on the clamps to 20 to 25 pound-inches.

 E.
Do the installation test for the check valve.

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

 S 864-022

 (2)  
AIRPLANES WITH PASSENGER CONFIGURATION; Remove the DO-NOT-OPERATE tag from the applicable (L or R) RECIRC FAN switch-light.

 (a)  
Push the switch-light to the on position.

 S 434-020
 S 864-035
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