Accession Number:

ADB010414

Title:

SST Technology Follow-On Program-Phase 2. Development and Evaluation of Fuel Tank Sealants

Descriptive Note:

Final rept. on Task 2

Corporate Author:

BOEING COMMERCIAL AIRPLANE CO SEATTLE WA

Personal Author(s):

Report Date:

1975-12-15

Pagination or Media Count:

252.0

Abstract:

The most promising candidate for sealing fuel tanks of the U.S.A. supersonic transport is a fluorosilicone designated DC 77-028 and DC 94-529. The sealing system was exposed to various environments and the effects evaluated on appearance, physical properties, and sealing effectiveness. Test specimens were exposed to more than 36 000 hr of 219 to 227 C 426 to 441 F fuel vapor in an accelerated cycle and more than 8000 flight cycles. A sealed tank simulating SST construction was exposed to more than 16 000 hr of 219 to 227 C 426 to 442 F fuel vapor in an accelerated cycle and about 6500 torsional load cycles each at -46 C -50 F, 232 C 450 F, and room temperature. Confidence was developed that the DC 77-028DC 94-529 fluorosilicone system would perform for 50 000 flight-hours as an integral fuel tank fillet sealant in a Mach 2.7 commercial supersonic airplane. Further development is necessary, however, to achieve this level of confidence for faying surface and injection sealant systems. Progress was also made in developing a backup sealant based on fluorocarbon, and exposing and testing were conducted on a fluorosilicone-fluorocarbon hybrid.

Subject Categories:

  • Civilian Aircraft
  • Adhesives, Seals and Binders
  • Fuels

Distribution Statement:

APPROVED FOR PUBLIC RELEASE