Technical data

13773-001
20-10
Page 730 Nov 2000
2. MAINTENANCE PRACTICES
A. Preparation for Sealing
(1) Acquire necessary tools, equipment, and supplies.
(2) Determine if structural repair is required. (Refer to 51-10)
(3) If repair is required, repair structure in accordance the standard structural repair practices.
(Refer to 51-10)
(4) Examine seal in suspect area and determine the seal level and seal plane in adjacent structure.
Note: The seal plane is the boundary plane through any assembly of structural items
that presents a continuous barrier to the flow of liquids or gases.
(5) Identify the type of sealant used in the area of the defect.
CAUTION: Do not interchange sealing compounds. Best results are obtained by using the
sealant compound originally applied to make repairs.
(6) Determine the type of seal (faying surface, fillet, injection, or brushed) required for the repair.
(7) Use sealant cutting tools to remove or notch the sealant in the defective area. Sufficient sealant
must be removed to produce a solid, intact seal on each side of the affected area.
Description P/N or Spec. Supplier Purpose
Sealant Removal and Cut-
ting Tools
- Locally
manufacture
Remove sealant
Pipe Cleaners - Any Source Remove sealant in
injectable gaps
Bristle Brush
(non-nylon)
- Any Source Clean up
Sandpaper, Aluminum
Oxide
200 grit Any Source Prep composite surfaces
Cotton cloth
(clean, lint free)
- Any Source Surface Cleaning
Isopropyl Alcohol TT-I-735
Grade A or B
Any Source Surface clean acrylic
windows or composite
materials.
Acetone ASTM D-329 Any Source Surface clean compos-
ite materials.
Protective Gloves - Any Source Protect hands from
chemicals
Goggles - Any Source Protect eyes from chemi-
cals