IIRC the A320 family a/c have a mandatory hard landing check after a touchdown of 2.6G or more, regardless of a/c weight.
The G is as measured by the IRS's. An auto print out of the landing stats +- 5 secs from first main gear touchdown comes out on the acars printer so there's no way the flight crew could miss it.
4.6 G is achieveable, my company had a 3.5G touchdown during windshear. They touched down with a lot of backstick and TOGA power applied and flew it off the bounce. Less or no corrective action would have resulted in a much harder landing. The a/c was found to be undamaged after the check, airbus build 'em strong!
Last edited by Locked door; 20th Aug 2009 at 20:43.