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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
SLOPING SLOPING

3

AIRPLANES WITH DRAINAGE TEST PORT WITH CAP AIRPLANES WITH DRAINAGE TEST PORT WITH MANUAL VALVE
AIRPLANES WITH DRAIN SCAVENGE TUBE (CONTINUOUS DRAINAGE)
Overwing and Pressure Deck Drains (Examples) Figure 2
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747-400
MAINTENANCE MANUAL

 (5)  
The wing and control surfaces are provided with drain holes, as are the wing boost pump access and crew service doors. The nacelle is provided with drain holes in the side cowls.

 (6)  
On some airplanes, drain holes are provided on all main entry door thresholds and on floor panels in each entryway, with drain tubes leading to exterior drains.

 4.  Main Deck Drainage
__________________
 A.  Airplanes having main deck cargo equipment have drainage facilities provided to remove water deposited on main deck during cargo loading operations.
 (1)  
Floor Drainage

 (a)  Floor drainage consists of screened collectors recessed into the floor and collectors mounted under power drive units.

 (2)  
Drain Lines

 (a)  Drain lines lead from all collectors to sump tanks, or in some cases empty into the bilge area.

 (3)  
Sump Tanks

 (a)  
Sump tanks are located near the bottom of the lower lobe to collect and temporarily store drain water while the airplane is pressurized.

 (b)  
A valve in the bottom of each tank allows the accumulated water to drain through the bottom of the body when internal and external pressure is equalized.

 (c)  
The aft sump tank is located in the under-floor area aft of the bulk cargo compartment. The forward sump tank is located under the center cargo tracks of the forward baggage compartment.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 EXTERNAL DRAINAGE - INSPECTION/CHECK
____________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
Inspection and Check of External Drains.

 (2)  
Clean and Examine the Drain System Aft of the Wing Center Section.

 (3)  
Canted Pressure Deck Check.

 (4)  
Canted Pressure Deck Pressure Check.

 (5)  
Canted Pressure Deck Detail Visual Check.

 B.  You must examine all the external drains with a regular schedule to make sure the drainage operates correctly.
 C.  The Canted Pressure Deck tasks are related with Airworthiness Directive 89-12-07.
 TASK 51-41-01-206-001
 2.  External Drains - Inspection/Check (Fig. 601 thru 606)__________________________________
 A.  References
 (1)  
AMM 51-41-01/801, Drainage Leveling Compound Repair

 (2)  
AMM 51-41-03/401, Fuselage Drain Valve

 B.  Consumable Materials
 (1)  
G01043 Cloth - Clean and Lint-Free

 (2)  
B00003 Cleaner - Mild, GMC 528B

 C.  Examine the external drains
 NOTE: Examine the external drain holes, drain valves, and drain inlet
____ screens regularly. If it is necessary, clean the drain holes and valves. Refer to the Clean the Drain Holes and Drain Valves paragraph. If it is necessary, repair the leveling compound (AMM 51-41-01/801).
 S 216-002
 (1)  
Examine the drain holes in the areas of the body, wing, empennage, nacelle, and control surfaces.

 S 216-009

 (2)  
AIRPLANES WITH HORIZONTAL STABILIZER FUEL TANK; Examine the screens (LH/RH) above the fuel/water drain holes, located below the horizontal stabilizer center section front spar.
　
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