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747-400 MAINTENANCE MANUAL
 (e)  Put the bolts into the floor panel.
 NOTE: Start all the bolts before you tighten them.
____ Bolts of two different lengths are used to hold some of the floor panels. The longer bolt locations are shown on the face of the panels by a triangular mark. A note is written on the face of the panels.
 NOTE: If you replace a stud in one of the blind fasteners,
____ tighten the new stud to 12-18 pound-inches.
 (f)  Tighten the floor panel bolts. 1) If the cork gasket on the support structure is not replaced, tighten the bolts to 13-15 pound-inches.
 2)  If the cork gasket on the support structure is replaced, tighten the bolts to 30-35 pound-inches.
 E.  Seal the Floor Panels for the Freighter.
 S 394-062
 (1)  
The entire main cargo deck of the freighter is considered a wet area. This includes the floor panels over the E/E main equipment center.

 S 394-063

 (2)  
Apply potting compound around the edges of all floor panels on the main cargo deck.

 S 394-067
 CAUTION: DO NOT CAUSE A BLOCKAGE WHEN YOU APPLY SEALANT NEAR OR AROUND
_______ THE FUSELAGE DRAIN HOLES, TUBES, OR PATHS. THE FUNCTION OF THE DRAIN HOLES IS TO DRAIN CONDENSATION AND FLUIDS OVERBOARD. IF YOU CAUSE A BLOCKAGE, FLUIDS WILL COLLECT IN THE AIRPLANE. THE FLUIDS CAN CAUSE CORROSION TO THE STRUCTURE, OR A FIRE IF THE FLUIDS ARE FLAMMABLE.
 (3)  
Apply BMS5-142 sealant in the gaps between the floor panels on the main cargo deck and upper deck.

 S 394-065

 (4)  
Apply urethane tape water barrier over the gaps in the floor beams in the wet areas on the upper deck.

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MAINTENANCE MANUAL

FLOOR BEAM (NO SPLICE).
Cord and Tape Installation (Example) Figure 401
G85662
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747-400 MAINTENANCE MANUAL
 F.  Put the Airplane to Its Usual Condition S 414-014
 (1) Install all the equipment which you removed.
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 LOWER LOBE FLOOR - INSPECTION/CHECK
___________________________________
 1.  General_______
 A.  This procedure has one task. This task gives instructions for a visual inspection of the lower lobe floor.
 B.  The lower lobe floor has walkways in the forward and aft cargo compartments. Also these walkways are in the bulk cargo compartment. The walkways and the floor panels consist of clad aluminum or aluminum extrusions.
 C.  The walkways and the floor panels are attached to the structure with screws. You do not have to apply the sealant to install the walkways or the floor panels.
 TASK 53-21-03-206-001
 2.  Lower Lobe Floor - Inspection/Check___________________________________
 A.  References
 (1)  51-24-09/701, Nonskid Surface Paint
 B.  Access
 (1)  Location Zones 121 Forward Cargo Container Compartment, Forward Half, Left 122 Forward Cargo Container Compartment, Forward Half, Right 123 Forward Cargo Container Compartment, Aft Half, Left 124 Forward Cargo Container Compartment, Aft Half, Right 141 Aft Cargo Container Compartment, Left 142 Aft Cargo Container Compartment, Right 145 Bulk Cargo Compartment, Left 146 Bulk Cargo Compartment, Right
　
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