Accession Number : ADA302556

Title :   737 Graphite Composite Flight Spoiler Flight Service Evaluation.

Descriptive Note : Annual rept. no. 3, Apr 76-Apr 77,

Corporate Author : BOEING COMMERCIAL AIRPLANE CO SEATTLE WA

Personal Author(s) : Stoecklin, Robert L.

PDF Url : ADA302556

Report Date : AUG 1977

Pagination or Media Count : 33

Abstract : The third annual flight service report was prepared in compliance with the requirements of contract NAS1-11668 and covers the flight service experience of 110 graphite-epoxy spoilers on 737 transport aircraft and related ground-based environmental exposure of graphite-epoxy material specimens for the period from April 1976 through April 1977. Four spoilers have been installed on each of 27 aircraft representing seven major airlines operating throughout the world. A flight service evaluation program of at least 5 years is under way. As of April 30, 1977, a total of 766 938 spoiler flight-hours and 1 168 090 spoiler landings had been accumulated by this fleet. Based on visual, ultrasonic, and destructive testing, there has been no evidence of moisture migration into the honeycomb core and no core corrosion. Tests of removed spoilers and of ground-based exposure specimens after the third year of service continue to indicate modest changes in composite strength properties. Ten advanced-design, all-composite spoilers were introduced into the program beginning December 18, 1975. All ten were withdrawn from service in August 1976 following an adverse experience in which polysulfone skin panels reacted to Skydrol hydraulic fluid. Redesign of the all-composite spoilers is planned.

Descriptors :   *COMPOSITE MATERIALS, *TRANSPORT AIRCRAFT, *SPOILERS, TEST AND EVALUATION, ENVIRONMENTS, CORES, CORROSION, EXPOSURE(GENERAL), MATERIALS, PANELS, STRENGTH(MECHANICS), COMMERCIAL AVIATION, FLIGHT, STRENGTH(GENERAL), ADVERSE CONDITIONS, MIGRATION, GROUND BASED, MOISTURE, GRAPHITED MATERIALS, EPOXY RESINS, SKIN(STRUCTURAL), HYDRAULIC FLUIDS, HONEYCOMB CORES, DESTRUCTIVE TESTS, POLYSULFONES.

Subject Categories : Transport Aircraft
      Flight Control and Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE