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 2.  External Drains
_______________
 A.  Drain ports are located on exterior surfaces of body, wing, and empennage to dump fluids overboard. Leveling compound is used to ensure proper drainage in sloping areas. Removable drain valves are used in pressurized areas. Seals within the drain valve close off ports when the airplane is pressurized and allow ports to remain open when the airplane is not pressurized. Drain ports in nonpressurized areas are always open.
 3.  Internal Drain Paths and Drain Holes
____________________________________
 A.  Internal structure is provided with tubes, channels, dams, and drain holes, to direct the flow of fluids toward external drainage points.
 (1)  Primary body drain paths are provided in the forward lower body area, in the overwing and wheel well area, and in the aft lower body area.
 CAUTION: IF STRUCTURAL REPAIR IS ACCOMPLISHED, ENSURE DRAIN HOLES AND
_______ DRAIN PATHWAYS ARE NOT INADVERTENTLY BLOCKED WITH SEALANT.
 (2)  Secondary body drain paths are provided to all stringer splice locations. Drain ports in the floor permit fluids to flow to the lower body skin where they drain overboard.
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 51-41-00
 ALL  ú ú B03 Page 1 ú Mar 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

C-C (TYPICAL)

BS 178
BS 360
BS
540
BS
727
BS
767
BS
908
BS 1016
BS 1088
BS 1156
BOTTOM VIEW - FUSELAGE

Airframe Drainage - Fuselage
Figure 1

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 51-41-00
 ALL  ú
 ú  B01  Page 2
 ú  Jun 25/85 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 EXTERNAL DRAINAGE - INSPECTION/CHECK
____________________________________
 1.  General_______
 A.  This procedure contains the task to do an inspection/check of the external drainage.
 B.  Examine the external drains regularly to prevent possible fire or corrosion.
 TASK 51-41-11-206-016-B00
 2.  External Drainage Inspection/Check__________________________________
 A.  Consumable Materials
 (1)  
G00500 Brush - Rigid Bristle

 (2)  
G01043 Cloth - Clean and Lint-Free

 (3)  
B00003 Cleaner - GMC 528B

 B.  References
 (1) AMM 51-41-13/401, Fuselage Drain Valve - Removal/Installation
 C.  Examine the Removable Drain Valve
 S 216-014-B00
 (1)  Examine the removable drain valve.
 (a)  
Examine the over board drain holes (with valves or with no valves) in the lower fuselage areas.

 (b)  
Make sure the drains are free of unwanted materials.

 (c)  
Clean the drains, if it is necessary.

 D.  Clean the Removable Drain Valves
 S 036-004-B00
 (1)  
Remove the valve (AMM 51-41-13/401).

 S 116-005-B00

 (2)  
Clean the valve with a water cleaner solution.

 (3)  
Use a rigid bristle brush to clean the valve.

 (4)  
Flush the valve with clear water.

 S 166-008-B00

 (5)  
Remove unwanted materials from the drain paths in the valve retainer if the drain paths are not clear.

 (6)  
Make sure the drain paths in the valve are clear.

 (7)  
Make sure the plunger and the spring stay installed in the valve.

 S 146-006-B00
 S 176-007-B00
 S 216-013-B00
 S 216-012-B00
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 ALL  ú ú B01 Page 601 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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