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No person may use an ATC transponder unless it has been tested and inspected within at least the preceding

A

6 calendar months.

B

12 calendar months.

C

24 calendar months.✓ Correct Answer

Explanation

14 CFR 91.413(a) prohibits using an ATC transponder unless, within the preceding 24 calendar months, it has been tested and inspected and found to comply with Part 43 Appendix F. 6 and 12 calendar months are not the transponder interval.

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