SR-22 Airframe Life Limit

I was looking at the SR20 and SR22 Datasheets at
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/533e90eaa002c1fb86256a07

006775c9/$FILE/a00009ch.pdf when I noticed this little bit of information: The airframe of the SR20 has a published life limit of 12000 hours while the SR22 has a published life limit of 4350 hours. That seems like a big difference to me, and having just picked up N188RD (SR22 SN 0042) I was just a little curious as to what these limits mean to the actual useful life of the airplane. Can anyone give me a little insight before I check with Cirrus?

Dan Begallie

N188RD

The airframe of the SR20 has a published life limit of 12000 hours while the SR22 has a published life limit of 4350 hours

This is normaol early in the life cycle of a plane - the airframe limit will be increased as more hours are accumulated on the aircraft in service.