Cycle Gas
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US $449.23
In aircraft gas turbine engin, what is "Low cycle fatigue"?
1)Definition of "low cycle fatigue"
2)Why important(aircraft gas turbine engine low cycle fatigue)?
3)Location(in gas turbine engien, disk? compressor?)?
4)Protection method or improvement(about low cycle fatigue)?
Are you asking about "LCF" parts?
"Life Cycle Fatigue", also referred to as "LLC" (life-limited components).
A set of very expensive rotable parts that must be replaced after a given number of cycles, regardless of condition. Also, regardless of engine maintenance program (ECMP/on-condition, or fixed TBO).
They're all in the hot section, power turbine blades, PT disks, there's 3 or 4 more, just can't remember.
Anyways, some are 5,000 cycles, some are 10,000 cycles, some are 20,000 cycles.
Typically, you get a prorated credit on LCF's with short time remaining that are removed in serviceable condition during an overhaul or hot section inspection. These are usually installed on engines with a fixed-time overhaul/HSI due before the part reaches its max cycle count.
A "cycle" is defined as the following sequence of events: cold start, take off, landing, shut down.
Engine manufacturers work with the FAA in setting the max cycle count. When new engines come on the market, frequently the cycle count is quite low, and increases dramatically over the first few years as engines come off-wing and the parts are inspected.
You may recall from the late 90's, an uncontained pt disk failure on an MD-80, resulting in a fatality on the runway as engine fragments penetrated the cabin.
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