TM-1-1500-344-23-2
AIRCRAFT VOLUME II
TECHNICAL MANUAL; CLEANING AND CORROSION CONTROL
APRIL 2009
TM-1-1500-344-23-2 - Page 135 of 240
7-19
NAVAIR 01-1A-509-2
TM 1-1500-344-23-2
15 April 2009
in triple layer thickness which may adversely affect
environmental sealing capability.
e. Tape may be applied to either the aircraft frame
or panel faying surface. Application of tape to the panel
faying surface is recommended, especially for panels in
corrosion prone areas of the aircraft, for ease of
subsequent airframe corrosion inspections.
CAUTION
Use care not to pull or stretch the ePTFE tape
as it is applied. The stretched ePTFE tape will
retract even if it is clamped between faying
surfaces which may reduce or eliminate overlaps
and allow water intrusion.
f. Peel the nonstick backing paper off the sealant
tape a little at a time as the tape is applied to the aircraft/
panel.
(1)
Applying extra pressure to the sealant tape
will cause the pressure sensitive adhesive to better
adhere to the faying surface and will create indentations/
discoloration at the fastener holes allowing for easy
identification.
(2)
For some areas and fasteners, it may be
necessary to pre-punch holes in the sealant tape at the
fastener locations. To locate holes and avoid mismatch,
either use the panel as a template for hole locations or
hold sealant tape in place and use pressure to create
discoloration at fastener holes. Pre-punch using a leather
punch with a diameter no greater than
1
⁄
4
inch more than
the fastener hole diameter.
g. If sealant without adhesive backing has been
ordered for use in areas where fluid exposure is expected,
MMM-A-189 plastic adhesive, or equivalent, may be
used to hold the ePTFE sealing tape in place. Apply
adhesive to airframe sill or panel and apply ePTFE
sealing tape within 20 minutes or before adhesive is
tack free.
h. After applying the full length of the sealant tape,
run fingers back and forth on the sealant to press tape
against the aircraft structure/panel surface to activate
adhesive and identify fastener holes. No curing time is
required.
i. Puncture all fastener holes using an object with a
sharp point such as an awl/scribe or scissors.
NOTE
As fasteners are installed, the ePTFE sealant
material pushed into the fasteners will help to
seal against moisture intrusion.
j. Install access panel. All fasteners should be wet
installed with corrosion preventive compound
(MIL-PRF-16173 Grade 4 or equivalent) as specified in
the aircraft maintenance manual.
7-7.8. REINFORCED POLYURETHANE GEL
SEALING TAPE (HI-TAK TAPE® TUFSEAL™), PEEL
AND STICK APPLICATION. These materials are
currently approved only for floorboard applications on
platforms where their use has been authorized. Prior to
application, prepare surface in accordance with
paragraphs 7-7.1 and 7-7.2.
CAUTION
After surface treatment and primer application,
do not contaminate areas to be sealed with
hands or tools.
Sealing and Coating Compound
12
Corrosion Inhibiting
MIL-PRF-81733
a. Examine surfaces to be sealed and build up any
uneven areas on the floorboard frame with
MIL-PRF-81733 Type II-1/2 sealant (preferred),
AMS 3255 compensation tape (P/N GSC-21-95158-011
or equivalent), or AMS 3277 sealant to create a level
faying surface for sealing.
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