Accession Number : ADA519867


Title :   Threats to Aircraft Structural Safety Including a Compendium of Selected Structural Accidents/Incidents


Descriptive Note : Final rept. 1 Jan 2009-30 Jan 2010


Corporate Author : AERONAUTICAL SYSTEMS CENTER WRIGHT-PATTERSON AFB OH DIRECTORATE OF ENGINEERING


Personal Author(s) : Babish, IV, Charles A ; Tiffany, Charles F ; Gallagher, Joseph P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a519867.pdf


Report Date : Mar 2010


Pagination or Media Count : 167


Abstract : This report discusses seven serious threats to structural safety that have become known as a result of past accident/incident investigations. The report describes the historic evolution of military and civilian aircraft structural requirements to prevent instantaneous and delayed structural failure due to these threats; these structural requirements have evolved over the last 60 years to address the threats. The report summarizes each threat and provides authoritative accounts of threat-related accident/incident investigations to further illustrate the nature of each threat; it also discusses lessons-learned and the impact of accidents/incidents on aircraft structural design and maintenance requirements. The report also describes the evolution of fail-safe design and testing, the development of the Air Force's Aircraft Structural Integrity Program, and the development of fracture mechanics based damage tolerance requirements for both military and civil aircraft. The difficulties in developing and validating operational limits to prevent structural failure due to widespread fatigue damage are also discussed. This report provides background for current and future generations of aircraft engineers so that they can: 1) better understand the current requirements; 2) potentially avoid repeating past mistakes; and 3) better address current and future challenges to aircraft structural safety. This report does not address some other threats to structural safety caused by structural overloads (those that far exceed design limits and cause essentially immediate catastrophic failure) due to excessive: 1) flight and/or ground loads (no matter the cause, e.g., pilot error, flight control system anomalies, etc.); 2) extreme turbulence and gust loads; and 3) aero-acoustic loads.


Descriptors :   *FAILURE(MECHANICS) , *AVIATION SAFETY , *ACCIDENTS , *AIRWORTHINESS , *STRUCTURAL INTEGRITY , MILITARY AIRCRAFT , IMPACT , DAMAGE , FLIGHT CONTROL SYSTEMS , THREATS , STRUCTURAL PROPERTIES , LOADS(FORCES) , PILOTS , FAILURE , TURBULENCE , DEFECTS(MATERIALS) , LIMITATIONS , ERRORS , HISTORY , AIRFRAMES , CIVIL AVIATION , FATIGUE(MECHANICS) , CATASTROPHIC CONDITIONS , GUST LOADS , AERODYNAMIC NOISE , AIRCRAFT DESIGN , MANUFACTURING , AIRCRAFT , AIR FORCE , ANOMALIES , MAINTENANCE , REQUIREMENTS


Subject Categories : Aircraft
      Safety Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE