"Newps" wrote in message
...

No idea as I never researched it that far. However this is one of the
most brought up topics on the Cessna Pilots Assoc website, usually
somebody with a 172 or 182 that wants to put three kids in the back seat.
The answer is you cannot legally put two people in one seat belt or use
some kind of belt extender to put three people under a combination of two
belts.

Ok, but that's not the FSDO's answer.

--Gary