Originally Posted by
transducer
Anybody know if there are any FAR/JAR certification requirements for the maximum time that it must take for the landing gear to retract?
Since there are no requirements that the gear retract at all, I doubt there is an explicit time for a retracting gear to do so. (Though I'll go check out of curiousity) The various times people are quoting are for their aircraft, not a regulatory time.
25.1301 would probably snag anyone with a 'retractable' gear that took an hour to retract (failure to perform intended function) but the practical limit is that the FARs will require that your performance be based upon the specified performance of the gear for retraction. So if you want to have decent climb performance you need a gear with a decent speed.