Accession Number:

ADA305636

Title:

Flight Service Evaluation of Kevlar-49 Epoxy Composite Panels in Wide-Bodied Commercial Transport Aircraft. Annual Flight Service Report (6th).

Descriptive Note:

Annual rept.

Corporate Author:

LOCKHEED-CALIFORNIA CO BURBANK

Personal Author(s):

Report Date:

1980-03-01

Pagination or Media Count:

41.0

Abstract:

Kevlar-49 fairing panels, installed as flight service components on three L-1O11s, were inspected after 6 years service. There are six Kevlar-49 panels on each aircraft a left-hand and right-hand set of a wing-body sandwich fairing a solid laminate under-wing fillet panel and a 422 K 300 degrees F service aft engine fairing. The three L-1011s include one each in service with Eastern, Air Canada, and TWA. The fairings have accumulated a total of 45,000 hours, with one ship set having 17,700 hours service. The inspections were conducted at the airlines major maintenance bases with the participation of Lockheed Engineering. The Kevlar-49 components were found to be performing satisfactory service with no major problems, or any condition requiring corrective action. The only defects noted were minor impact damage, and a minor degree of fastener hole fraying and elongation. These are for the most part comparable to damage noted on fiberglass firings. The service history to date indicates that Kevlar-49 epoxy composite materials have satisfactory service characteristics for use in aircraft secondary structure.

Subject Categories:

  • Transport Aircraft
  • Commercial and General Aviation
  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE