Analysis Concerning the Inspection Threshold for Multi-Site Damage
Final rept. Apr-Jun 1991
FRACTURESEARCH INC GALENA OH
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Periodic inspections, at a prescribed interval, for Multi-Site Damage MSD in longitudinal fuselage lap-joints start when the aircraft has accumulated a certain number of flights, the inspection threshold. The work reported here was an attempt to obtain justification for the threshold. It is based upon an analysis of fatigue data for lap-joints riveted as well as riveted plus bonded of a configuration closely resembling those in several types of aircraft. Depending upon the definition of threshold, the results show that it will be around 30,000 flights. Graphs are supplied upon the basis of which airworthiness authorities can determine a threshold in accordance with their preferred definition, and for different service conditions.
- Commercial and General Aviation
- Safety Engineering