(b)  
Defuel and purge applicable wing tank (Ref 28-23-0 and 28-10-0 MP).

WARNING:  FUEL AND FUEL VAPORS CONSTITUTE A POTENTIAL HEALTH AND EXPLOSION DANGER. OBSERVE ALL PRECAUTIONS GIVEN FOR PURGING AND FUEL TANK ENTRY.

(c)  
Enter center wing cavity No. 1.

(2)  
Airplanes with three cells in center tank:

(a)  
Defuel and purge center tank and applicable wing tank (Ref 28-23-0 and 28-10-0 MP).

(b)  
Remove center tank fuel cell No. 1 (Ref 28-12-13).

(3)  
Airplanes with integral center tank:

(a)  
Defuel and purge center tank and applicable wing tank (Ref 28-23-0 and 28-10-0 MP).

(b)  
Remove center tank access panel (Ref 28-11-31).

(c)  
Enter center tank.

2.  Remove Wing Root Rib Access Door (Fig. 401)
A.  Remove access door mounting bolts.
B.  Remove and discard access door O-ring.
C.  Protect sealing surfaces of panel and rib opening from scratching or other damage.
NOTE: The use of an edge protector around access opening is recommended.
3.  Install Wing Root Rib Access Door (Fig. 401)
A.  Remove access opening edge protector, if installed.
B.  Check that sealing surface is clean and install new O-ring.
C.  Install access door mounting bolts, and torque bolts 60 to 70 inch-pounds.
D.  Service main wing tank and check for leaks.
E.  On airplanes with one or two cells in center tank, install center tank access panel
(Ref 28-12-21).

F.  On airplanes with three cells in center tank, install fuel cell No. 1 (Ref 28-12-13).
G.  On airplanes with integral center tank, install center tank access panel (Ref 28-11-31).
518 
May 01/01  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-11-51 Page 401 

K19496
Wing Root Rib Access Door Installation  518 
28-11-51  Figure 401  May 01/01 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

ACCESS PANELS IN RIB NO. 5 - REMOVAL/INSTALLATION
1.  General
A.  This procedure has two tasks:
(1)  
The removal of one of the access panels in rib No. 5 (the rib at WBL 183.4)

(2)  
The installation of one of the access panels in rib No. 5 (the rib at WBL 183.4)

(3)  
Only one of the access panels can be removed from this rib at one time. The remaining access panel is necessary to support the wing structure.

2.  Remove Access Panels in Rib No. 5 (Fig. 401)
A.  Prepare to go into the applicable wing tank (AMM 28-10-00/201).
WARNING:  CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL THE FUEL TANK AND TO GO INTO IT. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
B.  Remove the No. 2 access panel for the applicable wing tank (AMM 28-11-11/401).
C.  Go into the applicable wing tank.
D.  Remove the mounting bolts from the forward or the middle access panel in Rib No. 5.
CAUTION:  DO NOT REMOVE THE TWO ACCESS PANELS AT THE SAME TIME. DAMAGE TO THE AIRPLANE CAN OCCUR.
E.  Put protection on the mating surfaces of the panel and the rib opening to protect from scratches or other damage.
3.  Install Access Panels in Rib No. 5 (Fig. 401)
A.  Remove the rubber cover that gives protection for the access opening, if one is installed.

B.  Make sure the mating surfaces of the access panel and the rib are clean.

C.  Attach the access panel to the opening with the mounting bolts.

D. Tighten the mounting bolts to the applicable standard torque (AMM 20-50-11/201).
E Install the wing tank access door No. 2 that you removed before (AMM 28-11-11/401).

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Rib Access Panel Installation  500 
28-11-53 Page 402  Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/01 

OVERWING FILL PORT - REMOVAL/INSTALLATION
1. General
A.  There are two overwing fill ports, one in each main fuel tank (Fig. 401). Each overwing fill port is found on the upper surface of the wing.
　
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