DI-SESS-82269
Structural Risk Analysis Report
Provides an evaluation of a potential structural hazard's severity and probability of occurrence to document structural risk analyses for design analyses, development testing, and force management execution.
Approval DateMay 17, 2019
AMSC NumberF10034
Preparing Activity11 (AFLCMC/EZFS)
Project NumberSESS-2019-021
OPR—
DTIC ApplicableNo
GIDEP ApplicableNo
Limitation—
Applicable Forms—
Approval Limitation—
Form Version—
DID Formatfree_text
963C CompliantYes
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Application & Interrelationship
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Use & Relationship
The Structural Risk Analysis Report provides an evaluation of a potential structural hazard's severity and probability of occurrence. Potential structural hazards include structural failures that can cause injury or death to personnel, damage to or loss of the aircraft, and dropped objects in flight resulting in reduction of mission readiness and availability.
This Data Item Description (DID) contains the format, content, and intended use information for the data deliverable resulting from the risk analysis work described in Tasks II and V of MIL-STD-1530, Aircraft Structural Integrity Program (ASIP), to document structural risk analyses for Design Analyses and Development Testing and Force Management Execution. (Copies of this document are available online at https://quicksearch.dla.mil.)
Preparation Instructions
1Reference documentsThe applicable issue of the documents cited herein, including their approval dates and dates of any applicable amendments, notices, and revisions, shall be as specified in the contract.
2FormatThe contractor's electronic format is acceptable.
3ContentThe Structural Risk Analysis Report shall include the following information:
aSystem descriptionThis section can be developed by referencing other program documentation, such as: technical manuals, system program plan, system specification, etc., and shall include the following:
(1)A general description of the airframeand its components, including: any unique or non-conventional materials, joining methods, and physical characteristics of the structure.
(2)A summary of planned and completedstructures development tests (e.g., element, component, and full-scale tests), to include: test findings and a summary of relevant in-service damage data that supports the risk assessment.
(3)Photos, charts, flow or functional diagramssketches, and schematics, as applicable, to support the system description, tests, and damage findings.
bRisk Evaluation (Single Flight Probability of Failure)This section shall include the following:
(1)A description of the probabilistic analysismethods and software used.
(2)A description of the aircraft componentsubcomponent, or detail part considered in each risk analysis.
(3)Documentation of deterministic input data sourcesassumptions, and data used in the risk analysis, such as:
(a)Static strength analysis for overload structuralrisk analysis.
(b)Durability and damage tolerance analysis forfatigue cracking structural risk analysis.
(4)Documentation of the probabilistic input datasources, assumptions, and data used in the risk analysis, such as:
(a)Part dimension variability
(b)Material static strength property variability
(c)Maximum stress exceedance per flight distribution
(d)Material crack growth rate variability
(e)Material fracture toughness distribution
(f)Equivalent Initial Damage Size (EIDS) distribution at manufacture
(g)Probability of Detection (POD) function for inspection method
(h)Equivalent Repair Damage Size (ERDS) distribution for the anticipated repairs
(5)Documentation of results of the risk analysisto include:
(a)Predictions of probability of failure
(b)Predictions of the onset of wide-spread fatiguedamage and loss of fail-safety, both as a function of flight hours, if applicable.
(c)A description of parametric evaluations to assessthe sensitivity of the risk analysis results to the uncertainties in the deterministic and probabilistic inputs.
cRisk Mitigation Planning (i.e., corrective actions)This section shall describe the risk mitigation options for structural components with a probability of catastrophic failure exceeding 10-7 per flight, such as:
(1)Operational restrictions(e.g., load factor restriction, weight restriction, airspeed restriction, reduced certified service life).
(2)Preventive maintenance provisions(e.g., inspections, repairs, modifications, replacement).
dRisk Mitigation ImplementationThis section shall describe implementation of corrective actions, such as: documentation of operational restrictions in the flight manual and documentation of preventive maintenance provisions in the Force Structure Maintenance Plan and corresponding Technical Orders.
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