MIL-HDBK-1530B(USAF)
5.4 Force management data package (Task IV). Maintenance of strength, rigidity, damage tolerance, and durability is dependent on the capability of the appropriate U.S. Air Force Commands to perform specific inspection, maintenance, and possibly modification or replacement tasks at specific intervals throughout the service goal (i.e., at specified depot- or base-level maintenance times and special inspection periods). The U.S. Air Force must have detailed knowledge of the required actions to perform these tasks properly. Additionally, experience has
shown the actual usage of military air vehicles may differ significantly from the assumed original design usage. It is necessary that the U.S. Air Force have the technical methods and actual usage data to assess the effect of these changes in usage on air vehicle damage tolerance and durability. Task IV describes the minimum required elements of a data package so the U.S. Air Force can accomplish the force management tasks as described in 5.5.
5.4.1 Final analyses. Preliminary design analyses should be revised as appropriate to account for significant differences revealed between analysis and test during the full-scale tests, and later during the loads/environment spectra survey.
5.4.1.1 Initial update of analyses. The design analyses as described in 5.2 should be revised when the results of the design development and full-scale tests as described in 5.2.14 through 5.3.9 are available. These initial updates will be used to identify the causes of problems, corrective actions, and production and force modifications required by the interpretation and evaluation of test results task as described in 5.3.10.
5.4.1.2 Final update of analyses. The initial update of the damage tolerance and durability analyses should be revised to reflect the baseline operational spectra as described in 5.4.4.2. These analysis updates should form the basis for preparation of the updated force structural maintenance documentation as described in 5.4.3. The documentation should identify the critical areas, damage growth rates, and damage limits required to establish the damage tolerance and durability inspection and modification requirements and economic life estimates.
5.4.1.3 Development of inspection and repair criteria. The appropriate analyses (stress, damage tolerance, durability, etc.) should be used to develop a quantitative approach to inspection and repair criteria. Allowable damage limits and damage growth rates established by the analyses should be used to develop inspection and repair times for structural components and assemblies. These analyses should also be used to develop detailed repair procedures for use at field or depot level. Special attention should be placed on defining damage acceptance limits and damage growth rates for components utilizing bonded, honeycomb, or advanced composite types of construction. These inspection and repair criteria should be incorporated into the force structural maintenance documentation as described in 5.4.3.
5.4.2 Strength summary. A strength summary and operating restrictions document should summarize the final analyses and other pertinent structures data into a format which will provide rapid visibility of the important structures characteristics, limitations, and capabilities in terms of operational parameters. It is desirable that the summary be primarily in a diagrammatic form that shows the air vehicle structural limitations and capabilities as a function of the important operational parameters such as speed, acceleration, center-of-gravity location, and gross weight. The summary should include brief descriptions of each major structural assembly, also preferably in diagrammatic form, that indicates structural arrangements, materials, critical design conditions, damage tolerance and durability critical areas, and minimum margins of safety. Appropriate references to design drawings, detail analyses, test reports, and other back-up documentation should be indicated.
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