fr8mech wrote:Doc, normally, we count pressurization cycles, though I do believe, as Yikes! mentioned, each touch and go is considered a cycle.
Neither landing gear cycles nor engine cycles are counted separately from airframe cycles.
747Whale wrote:I recently did a rejected takeoff; the RTO is an engine cycle, but not an aircraft cycle and there was no landing or pressurization. The engine reached takeoff temperatures and the problem occurred on a max power takeoff, so was a full engine cycle, though not an airframe cycle.
fr8mech wrote:747Whale wrote:I recently did a rejected takeoff; the RTO is an engine cycle, but not an aircraft cycle and there was no landing or pressurization. The engine reached takeoff temperatures and the problem occurred on a max power takeoff, so was a full engine cycle, though not an airframe cycle.
Not us. Our engine cycles equal airframe cycles. Of course, as engines are replaced, the cycles follow the engine, but so far as our tracking goes one takeoff/landing = 1 airframe cycle = 1 engine cycle = 1 landing gear cycle.
I can do max power runs on an engine all day long, within the confines of the engine limitations and not click over 1 cycle under our program.
Like many things when it comes to maintenance programs, it depends on the operator and what he sold to the administrator.
747Whale wrote:There are different definitions of cycle.
Dalmd88 wrote:I've worked at three different airlines, including one major, plus a stint as a contractor of the ANG. All cycles on everything were airframe cycles. Engine runs to full power did not count for anything,
747Whale wrote:Most operators count one flight as one cycle, and typically log them by landings when calculating cycles for inspection or life component purposes. A go-around doesn't alter the calculation of the cycle.
747Whale wrote:Again, cycle has a number of definitions, applicable to different components. If the flight stays below 10,000' and doesn't pressurize, (though most would pressurize regardless), it's still going to have a landing, which is also a type of cycle. Generally engines have landings, and airframes have cycles. An airframe that doesn't pressurize lacks some of the rigidity that comes from pressurizing, and consequently the strength, and may be subject to twisting and flex in flight that it might not otherwise experience; it may experience greater stresses, depending on the nature of the flight.
We use large airplanes doing firefighting, that don't pressurize on most missions; they still log landings and cycles.
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