Far29.927
I think the inference of the quote in #1445 above is that at some point there was testing carried out in order to meet the FAR29.927 requirements (i.e. the escape clause was not used) - if that was indeed the case some of the wording used is very pertinent to some recent thread discussion :
1) Category A. Unless such failures are extremely remote, it must be shown by test that any failure which results in loss of lubricant in any normal use lubrication system will not prevent continued safe operation, although not necessarily without damage, at a torque and rotational speed prescribed by the applicant for continued flight, for at least 30 minutes after perception by the flightcrew of the lubrication system failure or loss of lubricant.
Of course there may have been subsequent testing, or the escape clause may subsequently have in fact been used.