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A

747-400 MAINTENANCE MANUAL 
DRAIN INLETS 
DRAIN INLETS  SEE  A 
SEE  A 

AFT FAIRING DRAIN
AFT MIDSPAR DRAIN TUBE
STRUT DRY BAY CONDENSATE DRAIN
OUTBOARD STRUT
OVERBOARD DRAIN
DRAIN INLETS
SEE A
DRAIN INLETS

SEE A
DRAIN AFT FAIRING 
AFT MIDSPAR DRAIN TUBE 
STRUT DRY BAY CONDENSATE DRAIN 
DRAIN OVERBOARD  INBOARD STRUT  ENTRY SCREENS DRAIN INLETS WITH

DRAIN INLET (EXAMPLE) 
A 
Nacelle Strut Drain 
Figure 609 

E07474
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747-400 MAINTENANCE MANUAL
 S 216-062
 (5)  AIRPLANES WITH MANUAL DRAIN FITTINGS AND POST-SB 747-51-2045; Get access to the drain fittings through main wheel well and do the steps that follow:
 (a)  
Open manual valve and allow any water to drain.

 (b)  
If water flows out, do this task; Clean and Examine Drain System Aft of the Wing Center Section.

 (c)  
Close manual valve.

 S 216-020
 (6)  To make sure the drain fittings in the canted deck area are open and that the fluid can drain from the fuselage external drain fitting aft of No. 2 and No. 3 air conditioning ram air outlet, do the steps that follow:
 (a)  
Get access to the canted deck area through the main deck floor panels.

 (b)  
Remove all the corrosion inhibiting compound from the forward surface of the canted deck.

 (c)  
Make sure all the drains are open.

 WARNING: WHEN YOU EXAMINE THE DRAINS WITH COMPRESSED AIR, MAKE
_______ SURE YOU WEAR EYE PROTECTION GOGGLES. YOU CAN CAUSE INJURY IF YOU DO NOT WEAR EYE PROTECTION GOGGLES.
 (d)  
Use a compressed air source, blow the air through the drain fittings and lines. Make sure there is airflow from the opposite end.

 (e)  
Apply the corrosion inhibiting compound to the forward surface of the canted pressure deck (AMM 51-24-13/701).

 S 216-006
 (7)  Make sure the scuppers and tubes below the horizontal stabilizer are clear.
 D. Examine the operation of the drain system at section 48 (Figure 607).
 S 216-012
 (1)  To examine the drain system, put 5 gallons of the water into the left or right drains at BL 12.
 (a)  With the valve poppet at the closed position, make sure the water flows freely to the drain mast.
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747-400 MAINTENANCE MANUAL
 (b)  With the valve poppet at the open position, make sure the water flows freely from the drain valve.
 S 216-011
 (2)  
Examine the drain holes for blockage.

 S 216-013

 (3)  
Remove all blockage and unwanted materials.

 S 146-014

 (4)  
Clean the drain holes.

 E. Clean the Drain Holes and Drain Valves.
 S 116-037
 (1)  
Remove all the unwanted materials from the drain holes with a cheesecloth that is moist with the cleaner.

 S 116-007

 (2)  
Remove all the unwanted materials from the drain valves with a cheesecloth that is moist with the cleaner.

 S 116-015

 (3)  
For the drain valves you can remove, do these steps:.

 (a)  Remove the drain valve (AMM 51-41-03/401).
 NOTE: Remove the drain valve when you are in the wheel well.
____
 (b)  
Remove all the unwanted materials from the drain valves with a cleesecloth that is moist with the cleaner.

 (c)  
Install the drain valve (AMM 51-41-03/401).
　
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