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Question About Cycles

Sun Feb 25, 2001 12:10 pm

What exactly is a cycle? heh ....I know that they are used to judge the "age" of an aircraft....and I heard once that using thrust reverse puts another cycle on the engines....well since airtran used reverse thrust to go back from the gate wouldnt that put an extra cycle on the aircraft and therefore make it cheaper to just buy a pushback truck to use? thanks in advance=)
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RE: Question About Cycles

Sun Feb 25, 2001 12:22 pm

As far as I know, a "cycle" with respect to a jet engine is each time it's started, run to takeoff power, and then eventually shutdown. Engine starts (for taxiing, etc.) would not be considered a cycle, but an engine run-up my maintenance *would* be.

Long, long, ago, at a former airline far away (turboprop equipment, PT-6 powered) I seem to recall that *any* engine start/shutdown was considered a cycle. My brain is too feable to remember for certain, so perhaps maybe someone else can chime in...

ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
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RE: Question About Cycles

Sun Feb 25, 2001 12:35 pm

In the context of maintenance schedules, a cycle is identical to a landing.

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Joined: Mon Jul 10, 2000 4:51 am

RE: Question About Cycles

Sun Feb 25, 2001 12:36 pm

Speaking from my maintenance experience, unless the a/c goes flying, the cycle isn`t counted. In a paper based system, unless a pilot writes it down , the cycle didn`t happen. Therefore, mtce runs for any purpose just don`t show up. Overall, they are a small percentage of cycles, anyway.......

RE: Question About Cycles

Sun Feb 25, 2001 9:11 pm

Da Savage Man is back in the house!!!!!Been out doing the travelin' man thing for the last two weeks.....anybody miss me?????

Aircraft cycles pertain to takeoff, pressurize and then landing (for larger aircraft). Some say this is a better way to age an aircraft then flight hours. It could be said that an aircraft with 40K block hours (block hours are a different thing then flight hours...but that's a different subject) and 13K cycles, is "older" than and aircraft with 50K hours and 7K cycles. i.e. the first aircraft averaged three hour flights and the second aircraft averaged seven hour flights. This is most important for planning inspections and preventative maintenance due to the "flexing" of the pressurized compartment(s). Then, of course, you get into engine cycles and cycles for landing gear etc. etc. It all has to do with with the maintenance side of things.

Hey, why didn't anyone tell me that Speedos on Waikiki Beach will not get you any play? HeavyCapt, you are a POS!!!! Damn, I even rolled up a sock around my no avail. Thank god the strippers did not mind my black socks and sandels fashion statement!!!

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Joined: Mon Jan 15, 2001 5:00 pm

RE: Question About Cycles

Sun Feb 25, 2001 9:31 pm

Glad you are back....Somehow I just KNEW that if I told you to do it as a means of would try it........I bet it was hysterical.......any film of the blessed event ?. Please do remember that it was I who told you to wear speedo BOARDSHORTS.....(capitalization indicates a key word) and NO SOCKS !!!

All the while I knew you'd screw it up

Brock "don'tgetcaughtdeadina bananahammock" Mandrake

P.S. I'm gonna have to tell the chicks in Crew Scheds......

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