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 1.  General
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 A.  This subject provides a list of airplane systems filters that require scheduled cleaning or replacement.
 B.  Cleaning or replacement of filters or filter elements is covered in the respective chapter at the unit level.
 ~............................................................................... | |NO./| NO./ | | | | | NOMENCLATURE |UNIT| AIRP |ELEMENT TYPE | LOCATION | CHAPTER | ................................................................................. |AIR | | | | | | |CONDITIONING | | | | | | ................................................................................. |Overhead | 2 | 4 |Disposable |Above Main Deck Ceiling |21-25-05/401| |Recirculation | | | | | | |Fan Prefilter | | | | | | ................................................................................. |Overhead | 2 | 4 |Disposable |Above Main Deck Ceiling |21-25-05/401| |Recirculation | | | | | | |Fan | | | | | | |Particulate | | | | | | |Filter | | | | | | ................................................................................. |Underfloor | 2 | 4 |Disposable |Below Main Deck Floor |21-25-08/401| |Recirculation | | | | | | |Air Prefilter | | | | | | ................................................................................. |Underfloor | 2 | 4 |Disposable |Below Main Deck Floor |21-25-08/401| |Recirculation | | | | | | |Fan | | | | | | |Particular | | | | | | |Filter | | | | | | ................................................................................. |Cabin | 1 | 2 |Disposable |FWD Cargo Bay LH sidewall|21-32-02/401| |Pressure | | | | | | |Relief filter | | | | | | ................................................................................. |Crew Rest | 1 | 1 |Disposable |Above Main Deck Ceiling |21-29-04/401| |Area Supply | | | | | | |Fan Filter | | | | | |
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 12-23-00
 ALL  ú
 ú  01  Page 1
 ú  Feb 18/02 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 ~............................................................................... | |NO./| NO./ | | | | | NOMENCLATURE |UNIT| AIRP |ELEMENT TYPE | LOCATION | CHAPTER | ................................................................................. |Coalescer | 1 | 3 |Cleanable |Water Separator |21-51-05/201| .................................................................................
 |Flow Control  |  2 |  6  |Cleanable  |Air Conditioning Bay  |21-51-13/401|
 |and Shutoff  |  |  |  |  |  |
 |Valve  |  |  |  |  |  |

 ................................................................................. |Zone | 1 | 10 |Cleanable |Flight Deck/Passenger |21-61-06/201| |Temperature | | | |Cabin | | |Sensor Filter | | | | | | ................................................................................. |ELECTRICAL | | | | | | |POWER | | | | | | ................................................................................. |Scavenge | 1 | 4 |Disposable |Integrated Drive |24-11-04/401| |Filter | | | |Generator | | ................................................................................. |EQUIPMENT/ | | | | | | |FURNISHING | | | | | | ................................................................................. |Galley Water | 1 |Varies|Disposable |Galley Unit |25-31-12/201| |Filter | | | | | | ................................................................................. |Intake Filter | 1 |Varies|Cleanable |Air Chiller Unit |25-31-19/201| ................................................................................. |FLIGHT | | | | | | |CONTROLS | | | | | | ................................................................................. |Upper Rudder | 4 | 4 |Disposable |Upper Rudder Power |27-21-17/201| |Power Control | | | |Control Module | | |Module Filter | | | | | | ................................................................................. |Lower Rudder | 3 | 3 |Disposable |Lower Rudder Power |27-21-17/201| |Power Control | | | |Control Module | | |Module Filter | | | | | |
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 12-23-00
 ALL  ú ú 02 Page 2 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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