AAHHHH that’s cause it comes from a different decade. Remember the 3000 bit was retrospective on all stuff already built when the LBA wanted to define a life. After that the new design stuff eventually came with 6000 when they realised it wasn’t that pressing an issue. The final 12000 TOTAL TIS came after all the test results from the GFA and MIT fatigue testing was finished when the test rig broke and there wasn’t funding to fix it and continue testing past 36000 hours hence work on 3-1 and you get a conservative and industry accepted FoS of 12000 hours. The factory’s and the LBA accepted our test results. However Schleicher have given the ASK21 a life of 18000 TOTAL TIS when not used for aerobatics which it is rated for. Thus design for the higher denominator and if you don’t use it give back 33.3% thus 1 in 3 and the above rule applies and it is back to 12000 TIS. I hope that made sense. It did to the LBA and the Schleicher engineers Nige.
From: Ian Mc Phee Sent: Wednesday, May 30, 2012 5:39 PM To: [email protected] Subject: Re: [DOG mailing list] H36 3000 hour inspection Agree but think they want our results so as they can work out what problems are. I discovered HK 36 first inspection is 6000 hrs which is interesting. Ian m On May 30, 2012 4:32 PM, "Rob Thompson" <[email protected]> wrote: Can anyone explain the life extension process here? If we do all the required work and tests as per the schedule and it is signed out by a inspector with a survey ticket, why do we have to deal with the Diamond factory? Rob PO Box 129, Lawson, NSW, 2783. mobile 0429 493828
