This report contains documentation and analysis of existing loads spectra data, obtained from fixed-wing aircraft involved in the aerial firefighting role and operating as both air tankers and lead aircraft. Where appropriate, spectra from aircraft in other low-level roles, such as agricultural spraying, are included to demonstrate the relative severity of air tanker operations. Based on the analysis of the usage data and a relative damage criterion, preliminary spectra for different categories of air tanker operations are proposed. Every attempt was made to err on the side of conservatism; however, the inherent variation associated with air tanker operations may result in occasional occurrences outside the proposed spectra. Therefore, until more data becomes available, it is recommended that the proposed spectra be used in conjunction with structural health monitoring programs to ensure that the associated assumptions are not violated. Finally, it should be noted that most of the data and the spectra themselves are based on center-of-gravity acceleration data and, therefore, are applicable to structure contained within the center wing and fuselage of an aircraft.
Consolidation and Analysis of Loading Data in Firefighting Operations: Analysis of Existing Data and Definition of Preliminary Air Tanker and Lead Aircraft Spectra
2005
96 pages
Report
No indication
English
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