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Durability of high-pressure turbine blades

Thu Feb 20, 2020 7:56 pm

Does anyone on this form know how long high-pressure turbine blades in widebody engines usually last? On the web, I found anything from 2,500 to 20,000 cycles, which does not make much sense to me. Are HPT blades usually fully swapped out after the first shop visit, i.e. every 4-6 years?
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Joined: Fri Dec 10, 2004 8:19 pm

Re: Durability of high-pressure turbine blades

Tue Feb 25, 2020 2:48 pm

Depends upon a whole range of factors : type of engine, severity of operation, environment of use, etc. I've known HPT Blades that look sh***y and needing replacing after 800 cycles, I've known some that are OK for refitment after 6,000 cycles. There is no "typical". However, typically ( :D ) the whole set will be replaced at the same time to minimise the risk of an earlier-than-expected blade rejection due to one rogue refitted blade. However, I cannot speak for the practises of all overhaul bases / engine types.
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Joined: Sun Jun 22, 2014 7:14 pm

Re: Durability of high-pressure turbine blades

Tue Feb 25, 2020 11:31 pm

Engines are only pulled after degraded performance or maintenance findings. The record is around 12 years on a 737NG.
Posts: 1899
Joined: Mon Sep 24, 2001 6:44 am

Re: Durability of high-pressure turbine blades

Fri Feb 28, 2020 4:03 pm

We finally had our original LM2500 engine changed out after being installed for 19 years (1982 to 2001) GE wanted their engine back to study it.
Bonus animus sit, ab experientia. Quod salvatum fuerit de malis usu venit judicium.

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