Technical data

13773-001
20-10
Page 12 30 Nov 2000
(b) Remove metal and composite chips, shavings, and lint using stiff bristle brushes or vac-
uum.
(c) Solvent clean all surfaces using acetone or isopropyl alcohol. (Refer to 20-30)
WARNING:
Keep all sealants away from open flames or other sources of ignition.
Mix and use sealants only in areas with adequate ventilation.
Wear protective gloves when handling sealants and cleaned parts. Do not use
protective hand creams as they can contaminate the sealant.
Avoid skin contact. If contact occurs, wash area thoroughly with soap and water.
Wear goggles for eye protection. If accidental eye contact with sealant, sealant
components, or cleaning solvent occurs, immediately flush eyes with large quan-
tities of water and report to a doctor for further examination and/or treatment.
(3) Mix sealant as required.
(4) Apply sealant using the appropriate sealing techniques outlined in paragraph D. - “Sealing Tech-
niques.”
(5) Allow sealant to cure before handling.
D. Sealing Techniques
(1) Repairing Faying Surface Seal
The faying surface, is the overlapping area of the adjoining surfaces. Fay surface sealing is
accomplished by applying sealant to one mating part before assembly. Sufficient sealant must
be applied so it will squeeze out completely around the joint when the parts are fastened
together. In order to accomplish an adequate seal in an efficient manner, the following sealing
and cleaning procedures must be performed as specified. Examples of faying surface seals are
at the firewall attachment of the heat box and window installation.
(a) Disassemble components from structure to be sealed.
(b) If not already accomplished remove all sealant from faying surfaces with cutting tools and
suitable hardwood or plastic scrapers as described in paragraph A. - “Preparation for
Sealing.”
(c) Refinish damaged surface.
CAUTION: After thoroughly cleaning surfaces to be sealed, wear clean, white, cotton
gloves to prevent contaminating the surfaces to be sealed.
Use care in selecting solvent. Do not use acetone to clean acrylic. Use only
isopropyl alcohol for solvent cleaning acrylic surfaces.
(d) Solvent clean surfaces to be sealed. (Refer to 20-30)
CAUTION: Do not apply parting agent over paints, primers, or on acrylics.Parting
agents will lift paints and most primers and will craze acrylics. Epoxy prim-
ers are unaffected by parting agent.
(e) Removable seals shall be applied with the use of a parting agent. For fuel tank access
plates, apply parting agent to both surfaces. In all other cases, apply parting agent to one
surface only. When parting agent is dry to the touch, the parts may be faying surface
sealed and assembled.