757 MAINTENANCE MANUAL
G. Put the airplane back to its usual configuration
S 424-051
(1)
If the right recirculation air fan was installed, install the right-recirculation-filter access-panel in the forward cargo compartment.
S 424-057
(2)
If the left recirculation air fan was installed, install the sidewall panel on the left side of the forward cargo compartment, about two (2) feet aft of the forward endliner (AMM 25-50-02/401).
S 424-052
(3)
Close the No. 1 cargo door, 821 (Ref 06-46-00).
S 864-053
(4)
Remove the electrical power if it is not necessary (AMM 24-22-00/201
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757 MAINTENANCE MANUAL
RECIRCULATION AIR FILTER - REMOVAL/INSTALLATION
_______________________________________________
1. General_______
A. The recirculation filters are used to remove particles and odors from the air. The filters are installed in two filter holders which are on the left and right side of the mix manifold. The mix manifold is in the aft end of the forward cargo compartment.
B. This procedure contains the tasks that follow:
(1)
AIRPLANES WITH A SINGLE FILTER INSTALLATION;
(a)
Recirculation HEPA Filter Removal
(b)
Recirculation HEPA Filter Installation
C.
This procedure has four tasks:
(1)
AIRPLANES WITH A TWO PIECE FILTER INSTALLATION;
(a)
Recirculation Prefilter Removal
(b)
Recirculation Prefilter Installation
(c)
Recirculation High Efficiency Filter Removal
(d)
Recirculation High Efficiency Filter Installation
TASK 21-25-02-004-175
2. AIRPLANES WITH A SINGLE FILTER INSTALLATION; Recirculation HEPA Filter Removal (Fig. 401, 401A)_________________________________
A. General
(1)
There is a filter holder on each side of the mix manifold. Each filter holder has this filter:
(a)
A HEPA 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.
Procedure
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-164
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757
MAINTENANCE MANUAL
MIX MANIFOLD MIX MANIFOLD
DUCT
RECIRCULATION
FILTER RIGHT
SEE A
TOP RETAINER
AIR-
LEFT FLOW
SCREW
RECIRCULATION
FILTER
SEE B
FILTER SUPPORT
HIGH EFFICIENCY FILTER
PRE-FILTER
FWD
INBD
MIX MANIFOLD
RIGHT RECIRCULATION FILTER A
FILTER SUPPORT
1/4-TURN STUD (20 LOCATIONS)
AIR-FLOW
COVER ASSEMBLY
PRE-FILTER
HIGH EFFICIENCY FILTER
INBD FWD
MIX MANIFOLD
DUCT LEFT RECIRCULATION FILTER
B
Recirculation Air Filter
Figure 401 (Sheet 1)
M46308
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