Accession Number : ADA311031

Title :   Structural Integrity Evaluation of the Lear Fan 2100 Aircraft.

Descriptive Note : Final rept. Nov 93-Oct 94,

Corporate Author : NORTHROP GRUMMAN CORP HAWTHORNE CA MILITARY AIRCRAFT DIV

Personal Author(s) : Kan, H. P. ; Dyer, T. A.

PDF Url : ADA311031

Report Date : MAY 1996

Pagination or Media Count : 165

Abstract : An in-situ nondestructive inspection was conducted to detect manufacturing and assembly induced defects in the upper two wing surfaces (skins) and upper fuselage skin of the Lear Fan 2100 aircraft E009. The effects of the defects, detected during the inspection, on the integrity of the structure was analytically evaluated. A systematic evaluation was also conducted to determine the damage tolerance capability of the upper wing skin against impact threats and assembly induced damage. The upper wing skin was divided into small regions for damage tolerance evaluations. Structural reliability, margin of safety, allowable strains, and allowable damage size were computed. The results indicated that the impact damage threat imposed on composite military aircraft structures is too severe for the Lear Fan 2100 upper wing skin. However, the structural integrity is not significantly degraded by the assembly induced damage for properly assembled structures, such as the E009 aircraft.

Descriptors :   *AIRCRAFT MAINTENANCE, *INSPECTION, *STRUCTURAL INTEGRITY, NONDESTRUCTIVE TESTING, DAMAGE ASSESSMENT, COMPOSITE STRUCTURES, DEFECTS(MATERIALS), FUSELAGES, TOLERANCES(MECHANICS), WINGS, SKIN(STRUCTURAL), LANDING IMPACT, AIRCRAFT PANELS, MARGIN OF SAFETY.

Subject Categories : Terminal Flight Facilities

Distribution Statement : APPROVED FOR PUBLIC RELEASE