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Maintenance records show the last transponder inspection was performed on September 1, 2014. The next inspection will be due no later than

A

September 30, 2015.

B

September 1, 2016.

C

September 30, 2016.✓ Correct Answer

Explanation

Under 14 CFR 91.413(a) a transponder must have been tested and inspected within the preceding 24 calendar months. Calendar months run to the end of the month, so an inspection on September 1, 2014 remains valid through the last day of September 2016: September 30, 2016. September 30, 2015 would be only 12 months, and September 1, 2016 ignores the calendar-month rule.

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