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Sealant. GORE™ SKYFLEX® Sealant should be applied around
perimeter of the fl oorboard and wherever the fl oorboard touches
the fl oor supporting structure. This will ensure all contact areas of
the board are the same height.
For best sealing and compensation of variations between the
fl oorboards and the fl oor structure, the technique used is a
continuous cornering method with the large bulb overhanging the
edge of the fl oor panel.
A detail of the edge of the fl oorboard shows the large bulb
overhang. About 3mm of tape (the same width as the large bulb)
should overhang the edge of the board to permit panels to seal
against each other and the structure. This also allows liquid sealant
to be poured into gap.
To install the sealant tape begin near a fastener hole on the
straight edge of the board. Start by peeling back a few centimeters
of the release paper and apply the sealant with the large bulb
to the outside and overhanging the edge of the fl oorboard.
Cornering Method and Smoothing
At the corner, swing tape around
the corner with the large bulb in
position and allow the inside to
rise up (do not allow adhesive to
touch). Once the outside edge of
the tape is in place, stretch and
smooth the inside edge fl ush.
To smooth the inside of the
corner, the technician carefully
A fi nished corner should look
like this. Note that the sealant is
not overlapped and that corner
is fl at and smooth. This method
insures maximum sealing of the
fl oorboard.
Continue to install tape around
the perimeter of the board using
the same technique for the
corners until the starting point is
reached. Once the starting point
is reached, trim the length of the sealant to allow a 3 to 5mm
overlap. Remove the release paper and press the tape onto the
starting point.
Airbus A320 Aircraft Family Installation Guide
When all the sealant has been
applied to the panel, it is
ready for the fastener holes to
be punched out. The sealant
is very strong and fl at tipped
fasteners will have a diffi cult
time penetrating the sealant
unless pre-punched by a sharp
object such as a scribe or awl.
By rubbing the tape in place,
the pressure sensitive adhesive
is activated and fastener holes
can be located by the color change. The technician uses an awl to
punch the fastener hole.
The installation procedure of panels sealed with GORE™
SKYFLEX® Sealant is the same as the existing procedure (refer to
AMM). Floor structure must be clean and any corrosion or coating
repairs including corrosion prevention compounds (CPC), primer,
and paint must be applied and cured before fl oorboard installation.
If the overhanging material causes interference during
installation, manually compress the material to allow the board to
be installed.
5
Sealing Floorboard Interior
Once the sealant has been installed on the perimeter of the
board, a layer of sealant tape must be applied to any area of the
board that contacts the aircraft structure. This ensures all contact
areas are the same height and prevents bowing or “popping” of
the board when load is applied, as well as isolates the carbon
fi bers of the board from any exposed metal on the structure.
The perimeter of this fl oorboard has GORE™ SKYFLEX® Sealant
applied. The edge protection tape has been applied to the interior
of the fl oorboard where it contacts the structure. SKYFLEX®
Sealant has yet to be applied on top of the edge protection tape.
Here the sealant is being applied to the contact areas inside the
perimeter. This ensures all contact areas will be the same height.
The overlap with the perimeter tape should be approximately 1 to
2mm. When the width of the contact area is wider than one piece
of sealant tape, use two pieces of sealant side-by-side. Install the
tapes with the large bulbs facing out and overlap the tapes by 1
to 2 mm.
If the tape protrudes above the
level of the fl oorboard after
fl oorboard installation, use a
thin non metallic scraper to
push the sealant far enough
below the top of the board to allow
liquid sealant to be poured
into the gap.
Skyfl ex®
aircraft sealant
6
Shown are installed panels from the avionics bay. Note that sealant
is installed anywhere the fl oor structure contacts the fl oorboards.
Lav Mount Washer Kit
The drawing shows the placement
of the washers with adhesive
on each side of the spacers.
Washers without adhesive are
used under the fastener head.
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