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A 
747-400 
MAINTENANCE MANUAL 
DRAINAGE - RUDDER  (HOLES IN DRAINAGE  FIN TIP DRAINAGE 
SEE  A  RIB STRUCTURE) 

FIN FRONT AND REAR SPAR OVERBOARD DRAIN SLOTS 
FIN AUXILIARY SPAR NATURAL DRAINAGE DRAINAGE - STABILIZER SEE B  DRAINAGE RUDDER 
WL 316  A  A 
AUXILIARY SPAR STABILIZER HORIZONTAL OVERBOARD DRAIN  2360 B STA  DRAINAGE DRAINAGE - RUDDER FUSELAGE 
B STA 284  STABILIZER HORIZONTAL FRONT SPAR DRAINS  A 
FUSELAGE DRAIN (EXAMPLE)  STABILIZER HORIZONTAL REAR SPAR DRAINS 

FUSELAGE 
OVERBOARD 
DRAIN SLOT  ELEVATOR 
FRONT SPAR  HORIZONTAL 
DRAINAGE - STABILIZER  DRAIN  STABILIZER 
B (EXAMPLE)  EDGE DRAIN TRAILING  EXTERNAL DRAINS REFER TO NOTE: FOR INSPECTION/CHECK OF____ 
(EXAMPLE)  51-41-01/601. 

Internal Airframe Drainage - Empennage
Figure 603 (Sheet 1)

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A 747-400 MAINTENANCE MANUAL
 (b) (c) (d)  Remove the floor covering and panels.Visually examine the wing center section cavity. 1) Remove all the unwanted materials. 2) Make sure all the drain holes are clear.Examine the drain holes. 1) Remove all the unwanted materials. 2) Clean the drain holes if it is necessary.
 (4)  S 356-003Repair the leveling compound (AMM 51-41-01/801).
 (5)  S 216-004Make sure the drain path between the center and corner scuff plates is clean at all main entry doors. (a) If an entryway door drain is blocked with ice, slowly pour warm water into the drain to melt the ice.
 (6)  S 216-012Cut the groove in the sealant in the area outboard of the scuff plate, if the water stays on the drain path because of the sealant. 

NOTE:____  DRAINAGE FLOWS TO LOWER  A-A 
FUSELAGE AREA WHERE IT 
DRAINS OVERBOARD.

Internal Airframe Drainage - Empennage
Figure 603 (Sheet 2)

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A

747-400
MAINTENANCE MANUAL

PASSENGER COMPARTMENT RBBL 33.99
FLOOR BEAMS
LBBL 11.33
LBBL 57.50
LBBL 98.58
LBBL 127.5
WING
CENTER
SECTION

FWD
1  A DRAIN HOLE AND PLASTIC GROMMET IS ON THE BOTTOM OF EACH PLENUM CHAMBER AT BODY STATION 1205 AND LEFT AND RIGHT BL 21
2
LOCATION OF DRAIN TUBES BS 1020 BS 1160 BS 1040 BS 1180 BS 1060 BS 1200 BS 1080 BS 1220 BS 1120
CONDITIONED AIR
CONDENSATE DRAINAGE - SECTION 44

SEE A DRAIN TUBES
RBBL 127.5 RBBL 98.58 BS 1001
2
A
CONDITION AIR PLENUM CHAMBER
1
A
BS 1232
CONDITIONED AIR
CONDENSATE DRAINAGE - SECTION 44

A

Conditioned Air Condensate Drainage, Section 44
Figure 604 (Sheet 1)

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747-400 MAINTENANCE MANUAL
 S 216-005
 (7)  Make sure the drain lines and fittings at all main entry and upper deck door thresholds are clear and clean.
 (a)  Clean the drain lines and fittings if it is necessary, refer to "Clean the Drains" task.
 TASK 51-41-02-206-006
 3.  Examine the Conditioned Air Condensate Drains (Fig. 604)_____________________________________________
 A. References
 (1)  AMM 25-25-01/401, Track-Mounted Passenger Seats -Removal/Installation
　
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