MIL-STD-1530C(USAF)
planning, force structure planning, and maintenance planning. The initial FSMP will generally be based on the design loads/environment spectrum and shall be updated when the data from the Loads/Environment Spectra Survey (L/ESS) (described in 5.4.4) becomes available and a new baseline operational spectrum is developed. Additional updates, as described in 5.5.6, will be required when there are significant changes in operational usage and as dictated by damage discovered during scheduled inspections, surveillance sampling inspections conducted using the Analytical Condition Inspection (ACI) Program and structural teardown inspection programs, and/or normal operational maintenance of the aircraft. The structural maintenance database required to support these updates is described in 5.4.3.1.
5.4.3.1 Structural maintenance database development.
The structural maintenance database shall be developed to capture adequate, detailed information on the aging processes (fatigue, corrosion, delaminations, etc.) which occur in the aircraft and thus support the ongoing evaluation of structural integrity during sustainment. The database shall be developed to record all significant damage findings such as cracks, corrosion, and/or delaminations discovered during program depot maintenance, analytical condition inspections, time compliance technical order (TCTO)
structural inspections, teardown inspections, and normal operational maintenance. The database shall also be able to record a description of the damage types, damage sizes, damage locations, inspection techniques (including POD information), aircraft configuration, pertinent aircraft usage history including basing information, and corrosion preventive methods (e.g., wash cycles, coatings, etc.). The database shall also be able to record all significant repairs and/or modifications so as to maintain configuration
control. These records shall include a description of the repair/modification and when it was incorporated. Additional considerations for data to be recorded shall facilitate the analysis update described in 5.5.6.
5.4.3.2 Inspections.
Implicit in damage-tolerant structural designs are inspection requirements intended to ensure damage never reaches the sizes that can cause catastrophic failures. Inspections are required initially and at the repeat intervals described in 5.4.3.2.1. Such inspections shall continue to the estimated time, with the appropriate scatter factor, of the onset of WFD. At the onset of WFD, inspections are no longer sufficient to protect safety. The risk analysis of 5.2.16 shall be used to initially establish the time to onset of WFD. Upon their availability, the risk analysis updates of 5.5.6.3 shall be used to update the estimated time to onset of WFD.
5.4.3.2.1 Inspection intervals.
The criteria for the initial and repeat inspection intervals shall be as follow:
a. The initial inspections for fail-safe design concepts shall be established based on either:
1) fatigue analyses and tests with an appropriate scatter factor, or 2) slow damage growth analyses and tests assuming an appropriate initial flaw size.
b. The initial inspection for slow damage growth design concepts shall occur at or before one-half the life from the assumed maximum probable initial flaw size to the critical flaw size.
c. The repeat inspection intervals for both design concepts shall occur at or before one-half the life from the minimum detectable flaw size (based on the probability of detection) to the critical flaw size.
d. The risk analysis of 5.2.16 and 5.5.6.3 should be used to determine if a reduction in the inspection intervals are required to control the safety risk to an acceptable level or to reduce economic or availability consequences associated with damage repair.
5.4.3.2.2 Inspection methods.
Results from structural analysis shall be used to identify the inspection methods required to detect anticipated damage. Selection of the inspection methods shall consider material, geometry, accessibility,
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