Hello everyone. I have recently just started working as a CFI and am new to this forum, and have come across something in the flight school where I teach that no one can seem to answer, so I need your help.
As far as I understand, aircraft registration is valid for 3 years until the end of the month of when it was registered as per 14 CFR §47.40. The same regulation also specifies in a table how aircraft that have been "grandfathered" into the new system should have their registration renewed. I recently looked at the registration certificates of some of our aircraft and have found that their durations are almost twice the duration specified in Part 47, sometimes even more. Seeing this, I decided to search some aircraft from my old flight schools where I've trained on the FAA website, and found their registration certificates to also be longer than 3 years.
My question comes down to this: why are so many aircraft registration certificates valid for longer than the time specified in the regs? Are they registered under a different part? If so, then which regulation applies and why? What is the exception?
Thanks,
Dmitriy
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