Northwest727 From United States of America, joined Jul 2005, 491 posts, RR: 0 Posted (5 years 3 months 1 week 5 days 4 hours ago) and read 7652 times:
So, we all know what happens to old airplanes when they reach their end of life...beer cans (or so the joke goes).
What about the engines mounted on them? I know that an engine will often outlast the airframe, I even recall reading an Airliners magazine of the scrapping process of an airliner. In this case, it was an ex-Canadian 732 in which the JT8Ds were built in the late 1960s while the airframe was built in the mid 1970s. After the airframe was scrapped, the engines were simply inspected, loaded up onto pallets, shrink-wrapped, bar-coded, and sent off to a 732 operator in Africa.
So what happens to engines that reach the end of their design life, or are simply uneconomical to run (such as JT3Ds, RR Conways, etc.)? To further make it complicated, I recall reading that either the GEnx or the PW1000G, was designed to be "highly recycle-able;" does this mean that older engines are simply dumped for trash?
KELPkid From United States of America, joined Nov 2005, 6833 posts, RR: 3
Reply 1, posted (5 years 3 months 1 week 5 days 3 hours ago) and read 7629 times:
I would imagine that an old jet has a very high scrap value due to the exotic alloys involved, especially the disks after the combustion section of the engine.
Some old engines go to A&P schools for the students to continually crack them open and rebuild them and run on test stands. A few lucky ones get cut opened and gain plexiglass windows for exhibition in aviation museums
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
Viscount724 From Switzerland, joined Oct 2006, 29316 posts, RR: 25
Reply 7, posted (5 years 3 months 1 week 3 days 19 hours ago) and read 7055 times:
Quoting Northwest727 (Thread starter): So what happens to engines that reach the end of their design life, or are simply uneconomical to run (such as JT3Ds, RR Conways, etc.)?
The USAF acquired dozens of retired 707s many years ago mainly for their JT3D engines which were recycled in the first KC-135E re-engining program, replacing the original J57s. The last of those aircraft was retired a year or two ago.
MarkC From United States of America, joined Apr 2006, 259 posts, RR: 0
Reply 11, posted (5 years 3 months 5 days 16 hours ago) and read 6128 times:
I can understand why a scrap dealer would not be too interested in a complete engine. These are very difficult to take apart without special tools and fixtures, and the only people who have those are in the business of overhauling the engines. Even if a scrap dealer could take it apart, all the parts would be deemed scrap because he would not be FAA approved to work on the engine, and he could not resell any parts which are actually good. The dealer also would not have access to data showing what the parts are made from, and would not know which mills would be interested in parts. And they definitely would be interested in certain parts.
What is typicall done is to pay an overhaul shop maybe $50,000 to cannibalize an engine. You would know how much life (and therefore value) was left on all the life limited parts. You would have to guess as to the condition of any other parts, but you can be reasonably accurate if you are familiar with the old operator. They would charge you extra money for any parts made serviceable, and give you the parts deemed scrap for you to sell as scrap. You would have a fairly accurate understanding of what you would recover in terms of money. Some parts have all different fasteners and other items attached, and are uneconomical to even scrap. The engine status would change on the engine manufacturers record system as cannialized.
Northwest727 From United States of America, joined Jul 2005, 491 posts, RR: 0
Reply 12, posted (5 years 2 months 3 weeks 1 day 16 hours ago) and read 5535 times:
Thanks for the responses so far...but I am still questioning though. For example, what happened to all of the JT3Cs and J57s off of old 707s, 720s, and KC-135s go when the JT3D and TF33 became available, and the frames were re-engined. Where they scrapped?
cobra27 From Slovenia, joined May 2001, 1103 posts, RR: 0
Reply 15, posted (5 years 2 months 3 weeks 1 day 5 hours ago) and read 5397 times:
What about aeroderivative jet turbines for electricity and other industrial apllications. There are thousands turbines based of CF6 engine core? Is it possible to use lets some tuubine compressor or blades from older engines and put them on other engines?