(8)  
Remove the seal ring from the fill port.

 (a)  
Discard the O-ring.

 S 944-009
 CAUTION: PUT THE MAINTENANCE MATS ON THE WING LEADING AND TRAILING EDGE
_______ IN THE AREAS THE MAINTENANCE PERSON MUST STEP. DAMAGE TO THE PANELS CAN OCCUR.
 (9)  Put the maintenance mats on the wing leading and trailing edge panels.
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 S 144-035
 (10)
 Carefully remove the aerodynamic smoother from around the fill port.

 S 024-010

 (11)
 Lift the fill port from the opening in the top wing skin.

 S 034-025

 (12)
 Discard the O-ring.

 TASK 28-11-05-404-011
 3. Overwing Fill Port Installation (Fig. 401)
_______________________________
 A. Consumable Materials
 (1)  
D00128 Petrolatum - Techical, VV-P-236

 (2)  
Aerodynmic Smoother (BAC 5030)

 B.
Equipment

 (1)  
ST2580-302 - Torque Spanner

 (2)  
Maintenance Mats - for wing upper surface

 C.
References

 (1)  
AMM 12-11-01/301, Fuel Servicing

 (2)  
AMM 28-11-00/201, Fuel Tanks

 (3)  
SWPM 20-20-00, Electrical Ground and Bond

 (4)  
AIPC 28-11-54, Fig. 1

 D.
Access

 (1)  
Location Zones 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 543 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 643 Outbd Main Tank (Part), Front Spar to Mid Spar, Right

 (2)  
Access Panels
 544AB Fuel Tank Access Door
 546BB Fuel Tank Access Door
 644AB Fuel Tank Access Door
 646BB Fuel Tank Access Door

 E.
Procedure

 S 144-028
 (1)  
Prepare these faying surfaces for an electrical surface bond (SWPM 20-20-00):

 (a)  
Retaining Nut

 (b)  
Seal Ring

 (c)  
Fill port

 (d)  
Mating surface of the wing skin adjacent to the fill port (upper and lower surface)

 (e)  
Apply a protective coating to any surface that is exposed after installation.

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OVERWING
FILL PORT

SEE A
FILLER CAP 
LANYARD 
FILL PORT 
2 TOP WING SKIN SMOOTHER AERODYNAMIC  1 ELECTRICAL BOND SURFACE 
RETAINING NUT  SEAL RING 
2 1  FILL CAVITY (FLUSH WITH UPPER SURFACE) AROUND FILL PORT WITH AERODYNAMIC SMOOTHER. SURFACE BOND (SWPM 20-20-00). PREPARE THE FAYING SURFACES OF THE RETAINING NUT, SEAL RING AND FILL PORT FOR AN ELECTRICAL O-RING  A OVERWING FILL PORT (FILLER CAP SHOWN REMOVED) 
Figure 401 Overwing Fill Port Installation 

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 S 434-012
 (2)  Do these steps to install the O-rings:
 (a) Apply petrolatum to the new O-rings.
 (b) Install a new O-ring in the groove on the fill port.
 (c) Install a new O-ring in the groove on the seal ring.
 (d) Make sure the O-ring faying surfaces between structure and fill
 port components are free from all liquid applied coatings and
　
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