Technical data

13773-001
20-10
Page 2130 Nov 2000
(a) Acquire necessary tools, equipment, and supplies.
(b) Remove old sealant from cable pass-through fitting and firewall. Ensure fitting and firewall
are clear and free of old sealant.
(c) Ensure cable pass-through is securely fastened to firewall.
(d) Solvent clean firewall and cable pass-through using isopropyl alcohol. (Refer to 20-30)
(e) Wrap Fiber Frax paper around control cable in area where cable rests inside cable pass-
through.
(f) Insert the control cable (wrapped with Fiber Frax) through cable pass-through and into
position. Ensure cable and pass-through have a tight fit.
(g) Properly route and secure control cable.
(h) Fillet seal and cover entire cable pass-through on both sides of the firewall with high tem-
perature silicone sealant. (Refer to 20-10)
(i) Allow sealant to cure.
E. Reseal Integral Fuel Tank After a Structural Repair
The fuel tank was manufactured with a resin coating on all skin surfaces of the tank with injection and
fillet seals using MIL-S-8802 Class B extrudable sealant along all bond lines and at all penetrations for
tubing, fuel filler, and fuel level float. After a repair has been made to the composite structure of the fuel
tank, it will be necessary to reseal the tank in the area of the repair.
Access covers are faying surface sealed with MIL-S-8802 Class B sealant with parting agent applied
to both faying surfaces as described under D.1. - “Faying Surface Seals.”
Repairing seals at joggles at rib-spar intersections and along bond lines will be accomplished using
MIL-S-8802 Class B extrudable sealant in accordance with D.2. - “Repairing an Injection Seal,” and
D.3. - “Repairing a Fillet Seal.”
Repairs to bulkhead penetrations will be accomplished using MIL-S-8802 Class B sealant in accor-
dance with D.5. - “Repairing Tube Fitting Seals in Fuel Tank Bulkheads.”
Repairs to seals around fasteners in the fuel tank will be accomplished using MIL-S-8802 Class B
sealant in accordance with D.4. - “Fastener Sealing in Wet and Non-Wet Areas.”
Repairs to the surface of the wing structure will be made from the outside and the inside wing surfac-
ers must be resealed using MIL-S-8802 Class A brushable sealant using the following procedure:
(1) Prepare surfaces to be sealed.
(a) Preclean all surfaces using acetone or isopropyl alcohol solvent. (Refer to 20-30)
(b) Lightly sand the repaired area and adjacent area with 200 grit sandpaper.
Description P/N or Spec. Supplier Purpose
Sealant Removal and Cut-
ting Tools
- Locally
manufacture
Remove sealant
Isopropyl Alcohol TT-I-735 Isopro-
pyl Alcohol,
Grade A or
Grade B
Any Source Clean cable pass-
through free of
adhesive
Fiber Frax paper 1/8” 970J, TON0146 UniFrax Firewall insulation
High Temperature Sili-
cone Sealant
RTV 736 Dow Corning Sealant