Arcam AB fka AMAVF

[flying_trader]

Tom, please be clear about your complaints...

You say my post was poorly documented, well, lets take a look and see if we can see where the problem is.. I assume you did read the documentation provided..

The first assertion in the post was that Pre-LEAP commercial Jet Engines have a Time On Wing of about 25,000hrs before they are removed for service and to document that assumption I provided a link to a CFM data sheet where CFM states:


"A growing number of CFM56-3 engines reach more than 25,000 hours before their first shop visit removal"

And

"Expected first run life of more than 16,000 engine flight hours"

And

"CFM56-3 world record for high time on wing 38,736 hours"

While I did say "is 25,000" hrs I should probably have said "average is about 25,000 hrs" (but they only give you 8 words in the title) I am sure some get more and some get less... pick your number between "more than 16,000" and "record" of 38,836... or perhaps you don't feel CFM is a good source of information on this ? So who would know better ? Keep in mind the LEAPs are suppose to have a better maintenance cost than the CFMs they replace..

The second assertion was that Commercial Jets fly about 3,500 hrs per year and to document that assumption a link was provided to a USA Today article by John Cox who is a retired airline captain with U.S. Airways and runs his own aviation safety consulting company, Safety Operating Systems. He states in the article:

"3,500 hours a year as an average"

That number seemed reasonable to me as I saw other articles which quoted 3,000 and 4,000 but it depends greatly on how the plane is used e.g. Long Haul or Domestic, the operator Delta or say Alaska Air... This article explains the differences...

https://www.quora.com/What-is-the-typical-lifecycle-of-a-commercial-passenger-airplane


That brings us to my POV at this point (not a conclusion to the elimination of all other possibilities) that currently produced LEAPs and GEnXs MAY not see the shop for a long time (here again I am assuming, perhaps wrongly, that LPT blades don't get replaced while the engine is still mounted on the plane). Now to me a long time is more than 5 yrs and you may disagree that is a long time, so we can just agree to disagree on that point. But if you do the above implied math which I omitted as I thought it obvious, you get 25,000 hrs before a shop overhaul / 3,500 hrs run time per year = 7.14 yrs...

Or maybe you believe those LPT blades are replaced while the engine is still on the plane... I hadn't even considered that possibility but maybe...

Finally you may just disagree with the whole premise that replacement blades for the LEAPs and GEnXs is a material peice of business for Arcam via their customers and so none of this even matters... well, I would disagree...

But here i am guessing at what you found so deficient in my post on this topic and so I will just let you tell me... if you want to...

Cheers