MIL-HDBK-1530B(USAF)
the crack size limits, and the crack length as a function of the total flight time and usage. An appropriate tracking methodology should be developed and implemented to monitor and assess corrosion potential and other environmentally-driven structural or critical coating degradation modes. Environmental tracking data should be of sufficient fidelity to support analysis for future maintenance planning. Computer analysis methods should be compatible with the U.S. Air Force data analysis system.
5.4.5.2 Data acquisition provisions. The recording system should be as simple as possible and
should be the minimum required to monitor those parameters necessary to support the analysis methods as described in 5.4.5.1. Instrumentation and flight data recording equipment should be available to accomplish the necessary functions outlined above for individual air vehicle usage and to recognize changes in operational mission usage. Appropriate onboard environmental monitoring should be considered as a part of the recording system to assess ground and flight operations and exposures where other sources of data are not available.
5.5 Force management (Task V). Task V includes those actions which must be conducted by the
U.S. Air Force during force operations to ensure the damage tolerance and durability of each air vehicle. Task V will be primarily the responsibility of the U.S. Air Force and will be performed by the appropriate Commands, which will utilize the data package supplied in Task IV.
5.5.1 Loads/environment spectra survey. The ASIP manager will be responsible for the overall planning and management of the loads/environment spectra survey and will:
a. establish data collection procedures and transmission channels within the U.S. Air Force;
b. train squadron-, base-, and depot-level personnel as necessary to ensure the acquisition of acceptable quality data;
c. maintain and repair the instrumentation and recording equipment; and
d. ensure the data are of acceptable quality and are obtained in a timely manner to analyze the data, develop the baseline spectrum (see 5.4.4.2), and update the analyses (see 5.4.1.2) and force structural maintenance documentation (see 5.4.3).
The ASIP manager will also be responsible to ensure survey data are obtained for each type of usage that occurs within the force (training, reconnaissance, special tactics, etc.). Subsequent to completion of the initial data- gathering effort, the U.S. Air Force will elect whether or not to continue to operate either all or a portion of the instrumentation and recording equipment aboard the survey air vehicle to support additional updates of the baseline spectra and inspection and maintenance information to update the 6-series (Aircraft and Missile Fuel Systems)
and 36-series (Vehicles, Construction and Material-Handling Equipment) U.S. Air Force Technical Orders.
The initial survey period would typically last three to five years after Initial Operating Capability (IOC); however, the period may be longer for systems with a wide variety of usage types or a slow ramp-up of operations. If it is determined by the U.S. Air Force that the force usage survey data collection should be continued, the ASIP manager will, with Program Director and Lead/Operating Command participation and coordination, establish and document minimum baselined loads/environment spectra survey data
requirements and revalidate them on an annual basis. This minimum data requirement will become a part of the baseline to maintain airworthiness certification for the system. The USAF does not have a simple formula to determine the amount of data to be collected on a given system at any point in time after the initial survey. The minimum amount of survey data required depends heavily on the type of air vehicle, mission flexibility, fleet size, possible basing scenarios, communication with the operators, statistical sample size considerations, and the capability of the individual air vehicle tracking system to detect mission changes. As an initial planning number, it is recommended the force usage spectra data requirement be established as an average of ten-percent of the anticipated usage over a five-year period. The initially-established requirement and any subsequent revisions of the requirement will be approved by SAF/AQ upon the recommendation of the Technical Advisor for Aircraft Structural Integrity from the Engineering Directorate, ASC/EN, Wright-Patterson AFB OH.
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