Sealing of Integral Fuel Tanks
- Aerospace Standard
How well the basic design lends itself to good sealing (key design factors to consider include accessibility and minimal movement, among others).
The choice of sealant; where it is applied; how it is applied.
How good substrate surfaces are prepared.
Whether sealant fillet dimensions are optimum for aircraft configuration and flight dynamics.
The degree of resistance sealant has to fluid and thermal environments.
The degree of engineering insurance - i.e., application of adhesion promoters to sealant bond surfaces, application of organic topcoats over sealants, proper drainage of the fuel tank, etc. - employed for technical risk reduction.
|Aerospace Standard||Standard Requirements for Aerospace Sealants and Adhesion Promoters|
|Aerospace Material Specification||Sealing Compound, Polythioether Rubber Fast Curing for Integral Fuel Tanks and General Purpose, Intermittent Use to 360 °F (182 °C)|
|Aerospace Material Specification||Sealing Compound, Integral Fuel Tanks and General Purpose, Intermittent Use to 360 °F (182 °C)|
Data Sets - Support Documents
|Table 1||Polysulfide/Fluorosilicone type fuel tank sealants|
|Table 2||Polythioether type fuel tank sealants|
|Table 3||Polysulfide and polythioether base compound viscosities|
|Table 4||Channel type sealant|
|Table 5||Sealant type and class versus use|
|Table 6||Leak classification – Integral fuel tanks|
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AMS Committee G9, Aerospace Sealing, is primarily responsible for the preparation, revision, and review of documents related to the sealing of aerospace vehicles for fluid containment and environmental protection by the use of sealants which are applied and cured to solid materials or are permanently mastic. Common sealant application examples include the sealing of integral fuel tanks, fuel bladder cavities, crew and passenger areas, access doors, fasteners, avionics compartments, windshields, and firewalls. The committee shall discuss sealing material and process developments, material property requirements, test methods, the effect of the environment on cured and uncured sealant materials and their containers, and emerging sealant industry challenges. The committee has dedicated subcommittees to address elastomeric aircraft fuel bladders, new sealant specification requirements, surface preparation for sealing, and sealant application and removal technologies.