Flight Service Evaluation of Kevlar-49 Epoxy Composite Panels in Wide-Bodied Commercial Transport Aircraft. Annual Flight Service Report (6th).
LOCKHEED-CALIFORNIA CO BURBANK
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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.
- Transport Aircraft
- Commercial and General Aviation
- Laminates and Composite Materials