NOTE: THE 500 NUMBER SERIES IS USED WITH THE LEFT WING. THE 600 NUMBER SERIES IS USED WITH THE RIGHT WING.
1 HIGH IMPACT RESISTANT DOOR INSTALLED
Mid Spar Access Door (Wing Access)
Figure 401

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F84630
A

747-400 MAINTENANCE MANUAL
552AZ 552CZ
652AZ

LEFT WING SHOWN
(RIGHT WING OPPOSITE)

MIDSPAR ACCESS DOOR  MIDSPAR ACCESS DOOR 
____NOTE:  THE 500 NUMBER SERIES IS USED WITH THE LEFT WING. THE 600 NUMBER SERIES IS USED WITH THE RIGHT WING. 
Figure 402 (Sheet 1) Midspar Access Doors 

 F80952
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747-400
MAINTENANCE MANUAL

A
A
MIDSPAR
BOLT (30 LOCATIONS)
MIDSPAR ACCESS DOOR
BOLT (WITH LOCKWIRE PROVISIONS)FWD INBD WASHER INSPECTION SEAL LOCKWIRE
1
MIDSPAR ACCESS DOOR (EXAMPLE) (VIEW IN THE FORWARD DIRECTION)
NUTPLATES 
1  ADD AN INSPECTION SEAL TO THE LOCKWIRE (IF IT IS LOCKWIRE THESE TWO BOLTS. NECESSARY).  FWD  A-A 
Midspar Access Doors Figure 402 (Sheet 2) 

F81097
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747-400 MAINTENANCE MANUAL
 S 654-003
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND TO GO
_______ INTO THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (1)
Obey all the fuel tank entry precautions (AMM 28-11-00/201).

 S 654-004

 (2)
Defuel the applicable outboard main tank(s) (AMM 28-26-00/201).

 S 014-001

 (3)  
Prepare the outboard main tank(s) for an entry (AMM 28-11-00/201).

 S 014-032

 (4)  
Remove the correct main tank access door to get to the applicable mid spar access door (Fig. 401) (AMM 28-11-02/401).

 S 944-005
 CAUTION: ACCOUNT FOR ALL PERSONNEL AND ITEMS GOING INTO FUEL TANK.
_______
 (5)  
Go through the main tank access door to get to the mid spar.

 S 024-006

 (6)
To remove the mid spar access door, do these steps (Fig. 402):

 (a)  
Remove the lockwire from the two mounting bolts.

 (b)  
Remove the mounting bolts and washers from the mid spar access door.

 (c)  
Keep the mounting bolts and washers for the installation.

 (d)  
Remove the mid spar access door.

 TASK 28-11-25-404-007
 3. Mid Spar Access Door Installation (Fig. 402)
_________________________________
 A. References
 (1)  
AMM 28-11-00/201, Fuel Tank

 (2)  
AMM 28-11-02/401, Main Tank Access Door

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747-400
MAINTENANCE MANUAL

 B. Access
 (1)  
Location Zones
 546BZ Outbd Main Tank, Mid Spar, Left
 552AZ Outbd Main Tank, Mid Spar, Left
 552BZ Outbd Main Tank, Mid Spar, Left
 552CZ Outbd Main Tank, Mid Spar, Left
 552DZ Outbd Main Tank, Mid Spar, Left
　
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