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 TASK 51-41-02-206-001
 2.  Examine Internal Drains_______________________
 A.  References
 (1)  AMM 51-41-01/801, External Drainage
 B.  Procedure
 S 216-002
 (1)  
Make sure the internal drain holes and drain paths shown in Fig. 601 through 605 are clear.

 S 116-011

 (2)  
Clean the drains if it is necessary, refer to "Clean the Drains" task.

 S 216-010

 (3)  
To examine the wing center section cavity and the drain holes, do the steps that follow:

 (a)  Remove the seats.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

MAIN ENTRY
FORWARD DOOR NO. 2 S-26R
S-34R
S-39R TOILET

S-44R PANEL BBL 0
S-44L
S-39L
S-34L
S-26L
ACCESS DOOR
LEGEND
DRAIN HOLE

RELIEF CUTOUT IN SHEAR TIE STRINGER
STRINGER DRAIN HOLE
DRAIN PATH

NOTE:  FOR EXTERNAL DRAIN HOLE
LOCATION, REFER TO 51-41-01/601

 

A-A (EXAMPLE)

Internal Drainage Section 42
Figure 601

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
BS 1480
S-26R

1900AFT CARGO DOOR
LEGEND:

STRINGER DRAIN HOLE DRAIN PATH MLG TRUNNION BACKUP FITTING DRAIN HOLE DRAIN PATH UNDER STRINGER RELIEF CUTOUT IN SHEAR TIE NOTE:FOR EXTERNAL DRAIN HOLE
A 747-400 MAINTENANCE MANUAL
MAIN ENTRY
DOOR NO. 4
AFT CARGO DOOR
BS
BS BS BS 1600 1700 1800 1900
S-34R S-40R S-46R
BBL 0
S-46L
S-40L
S-34L
S-26L

 

 

 

SPLICESPLICE 
BS BS 2360 BSBS 2300 BS 2200 BS 21002000 MAIN ENTRY DOOR NO. 5 BULK CARGO DOOR  S-26R 
S-34R 

 S-46R S-40R  PANEL SERVICE TOILET 

 BBL 0 

 S-46L 

 S-40L 

 S-34L 

 S-26L 

LOCATION, REFER TO 51-41-01/601 Internal Drainage Section 46 Figure 602 (Sheet 1)
S-26R
S-34R S-40R S-46R
BBL 0 S-46L S-40L S-34L
S-26L
BS 1961

 

DOOR (2 LOCATIONS)
BS 1741
BS 2189
SPLICE

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 ALL  ú
 ú  01  Page 603
 ú  Jun 10/90 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

BS  BS  BS  DRAIN VALVE  LEVELING 
2180  2189  2193.6  FOAM DAM  COMPOUND 
B 

S-44L UP
B
WATERLINE INBD
A-A
S-46L LEVELING FOAM DAM
S-47L COMPOUND
S-48L
S-49L UP FOAM DAM
WATERLINE
A
FWD
B-B
S-50L STRINGER FRAMES-51L A LEVELING
BBL 0
COMPOUND LEVELING COMPOUND S-51R
DRAIN HOLE FOAM DAM
FWD
DRAIN HOLES
(LEFT SIDE SHOWN D-D
RIGHT SIDE OPPOSITE)
A STRINGER
BS
S-20L
2291.1 S-20R
2291.1
D STRINGER S-21L

2291.1 S-21R
2291.1 S-22L
2291.1 S-22R
2291.1
FOAM DAM
S-23L

2291.2 S-23R
2291.2 S-24L
2291.3 S-24R
2291.3 S-25L
2291.3 S-25R
2292.3
D C-C
ADDITIONAL DRAIN HOLES
Internal Drainage Section 46 Figure 602 (Sheet 2)
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