(2)  
Put the top retainer on the filter holder.

 (3)  
Install washers and screws to hold the top retainer in position.

 S 414-182
 S 414-183
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757 MAINTENANCE MANUAL
 F.  Put the Airplane Back to its Usual Condition
 S 864-184
 (1)  
Remove the DO-NOT-OPERATE tags from the L and R PACK selectors, on the P5 panel.

 S 864-185

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

 S 414-186

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

 S 414-187

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

 S 864-188

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

 TASK 21-25-02-004-082
 4.  AIRPLANES WITH A TWO PIECE FILTER INSTALLATION; Recirculation Prefilter Removal (Fig. 401)_______________________________
 A.  General
 (1)  
There is a filter holder on each side of the mix manifold. Each filter holder has these filters:

 (a)  
A prefilter

 (b)  
A high-efficiency filter

 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

 C.  
Access

 (1)  
Location Zones 125 Area aft of the forward cargo compartment (Left) 126 Area aft of the forward cargo compartment (Right)

 D.  
Prepare for Removal

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

 S 864-083
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A

757
MAINTENANCE MANUAL

 S 864-084
 (2)  
Turn the L and R PACK selectors, on the overhead panel, P5, to the OFF position.

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

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

 S 864-085
 (3)  
Push the applicable (L or R) RECIRC FAN switch/lights, on the P5 panel, to the off position.

 (a)  
Make sure the INOP light comes on.

 (b)  
Put a DO-NOT-OPERATE tag on the RECIRC FAN switch/light.

 S 014-086
 (4)  
Open the No. 1 Cargo Door, 821 (AMM 06-46-00/201).

 S 014-088

 (5)  
To remove the right recirculation prefilter, remove the right-recirculation-filter access-panel on the aft bulkhead of the forward cargo compartment.

 E.
Remove the Left Recirculation Prefilter

 S 014-089
 (1)  
Loosen the 1/4-turn studs on the cover of the forward face of the filter holder.

 S 014-090

 (2)  
Remove the cover.

 S 024-091

 (3)  
Pull the prefilter out of the filter holder.

 NOTE:____The filter may be hard to move. It is held in position by springs which push the filter toward the mix manifold.
 (a)  
To remove the prefilter media, do this step: 1) Twist the frame and remove the media.

 F.
Remove the Right Recirculation Prefilter

 S 014-095
 (1)  
Remove the screws and washers from the forward face of the filter holder.

 (2)  
Remove the top retainer.

 S 014-096
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