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A330 Utilization Question  
User currently offlineKFlyer From Sri Lanka, joined Mar 2007, 1230 posts, RR: 0
Posted (3 years 8 months 3 weeks 6 days 17 hours ago) and read 2958 times:

I have been going through a certain airline's A330-200 rotation plans and noted that one of the four plans (four a/c, interchanging each week) has a 32hr layover per week. The other three have their longest layover ranging from 8hr to 13hr. The average daily utilization per frame is around 14hrs. Is this 32hr layover required ? What made me ask this was the fact That one of the same airline's A332s on a different config run a non-interchanging rotation plan which includes no such long layover. Is there no way to avoid this long layover ? If the same airline is capable of conducting checks in one A330 without any such layover (likely with periodical type changes on its flights, when a check is due), why not for these four frames too ? All are Trent 772 and run on similar routes.

[Edited 2011-03-01 04:32:04]


The opinions above are solely my own and do not express those of my employers or clients.
7 replies: All unread, jump to last
 
User currently offlineairceo From Canada, joined Feb 2010, 98 posts, RR: 0
Reply 1, posted (3 years 8 months 3 weeks 6 days 13 hours ago) and read 2634 times:

Without knowing which airline you're talking about this is all a bit cryptic...

My suspicion is that the rotation is in force to ensure balanced utilization of that sub-fleet and to balance out cycle accrual and the consequent amortization/depreciation on the frames. Given that no similar rotation is in place for the other sub-fleet I suspect that the 32 hour layovers are a function of scheduling of the first fleet rather than the airline's ability to service one fleet more effectively than the other.


airceo



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User currently offlineRoseFlyer From United States of America, joined Feb 2004, 9690 posts, RR: 52
Reply 2, posted (3 years 8 months 3 weeks 6 days 1 hour ago) and read 2114 times:

Typical maintenance cycles for airplanes require about 12-18 hours on the ground once ever 30-40 days at a maintenance base. 32 hours is longer than typically necessary for an A level check. 32 hours also is on the short side for a C level check, since those typically last 2-3 days.

Without knowing what airline, this is really cryptic. Also could the subfleet substitute for each other when one plane goes into maintenance?

Another possibility is that the airplane is used for other purposes such as charter or as a spare.



If you have never designed an airplane part before, let the real designers do the work!
User currently offlineKFlyer From Sri Lanka, joined Mar 2007, 1230 posts, RR: 0
Reply 3, posted (3 years 8 months 3 weeks 6 days 1 hour ago) and read 2086 times:

RoseFlyer, the airline is my national carrier - if its ok to share -. They've got only five 332s. The special one doesn't interchange with these aircraft at all. There is a 12hr break for every rotation except this rotation which every A332 will fly once a month. No charters flown I'm sure. This rest is on the weekend which makes it look like a waste of resources. There are not very many weekend flights by them so no need for a spare.

HB-IWC anywhere near ?  



The opinions above are solely my own and do not express those of my employers or clients.
User currently offlineHB-IWC From Indonesia, joined Sep 2000, 4513 posts, RR: 72
Reply 4, posted (3 years 8 months 3 weeks 6 days 1 hour ago) and read 2070 times:

Ground times are not only built into the schedule to provide for regular maintenance. Ground time is needed for a host of different issues. A very important one is to induce operational stability into the system that would allow to prevent operational irregularities to ripple through the network for days. A subfleet of just 4 aircraft is inherently operationally unstable and cannot return the kinds of utilization rates that a 20-strong subfleet could handle. As it goes, a daily utilization rate of about 14 hours is not bad at all for such a small fleet and to have each aircraft on the ground for 32 hours once every 4 weeks provides the necessary times for maintenance and deep cleaning, while keeping a healthy level of spare capacity at hand.

User currently offlineKFlyer From Sri Lanka, joined Mar 2007, 1230 posts, RR: 0
Reply 5, posted (3 years 8 months 3 weeks 6 days 1 hour ago) and read 2061 times:

HB-IWC, thanks ! But does this mean this is technically not a requirement ? How often does an A330 must have a technical break ?


The opinions above are solely my own and do not express those of my employers or clients.
User currently offlineHB-IWC From Indonesia, joined Sep 2000, 4513 posts, RR: 72
Reply 6, posted (3 years 8 months 3 weeks 5 days 19 hours ago) and read 1811 times:

The actual maintenance requirements are very much dependent on the kind of flying program the aircraft are engaged in, i.e. the number of block hours and the number of cycles. The proposed ground time is likely more than is strictly necessary and therefore represents the airline's buffer against system wide operational irregularities. With a subfleet of just 4 aircraft, that is really not such a bad idea.

User currently offlineKFlyer From Sri Lanka, joined Mar 2007, 1230 posts, RR: 0
Reply 7, posted (3 years 8 months 3 weeks 4 days 3 hours ago) and read 1308 times:

Nick, I fully understand. But how does a charter carrier manage this ? I've heard that thanks to irregular skeds, they tend to squeeze out more hours out of an aircraft?


The opinions above are solely my own and do not express those of my employers or clients.
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