Variable data. Data in this category are of a semi-permanent nature but are liable to change and provision must be made for changes to be promulgated promptly, Data in this category would include such items as runway declared distances, obstacles, hours of operation, visual aids and such facilities as rescue, fire fighting, and salvage. It is doubtful whether data in this category would change more frequently than once per year.
Variable data. Data in this category are of a semi-permanent nature but are liable to change and provision must be made for changes to be promulgated promptly, Data in this category would include such items as runway declared distances, obstacles, hours of operation, visual aids and such facilities as rescue, fire fighting, and salvage. It is doubtful whether data in this category would change more frequently than once per year.
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