LY777
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How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 12:56 am

My question may be silly, but I would like to know often modern airliners have technical problems before boarding: It is not rare that there is a 1, 2 or 3 hour delay before a flight due to technical problems.
Thanks
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n710ps
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RE: How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 3:37 am

So to continue with my spew of sarcasim today I will put it like this. JetBlue E190's count on it every time. ASA just show up an hour late and you will be right on time.

Seriously though. It depends on the plane. In our fleet ship 706 is the queen of the attention whores.
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FredT
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RE: How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 4:36 am

We had a dispatch reliability on our aircraft which was in the upper percent. That's fleetwide, worldwide.
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MD11Engineer
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RE: How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 5:20 am

Most airlines today have dispatch reliabilities of bigger than 95%, this means out of 100 departures the plane is delayed for technical reason for 5 departures or less.
[sarcasm]I hope that you prefer us to FIX the problem before the flight or do you prefer to fly on a plane with a known defect? [/ sarcasm]

Jan
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tdscanuck
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RE: How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 7:30 am

Quoting LY777 (Thread starter):
My question may be silly, but I would like to know often modern airliners have technical problems before boarding: It is not rare that there is a 1, 2 or 3 hour delay before a flight due to technical problems.

It really depends on how you define "problem". A problem that leads to a delay (more the 15 minutes late) should happen about 1-2 times per hundred flights (on average). Less often on small single aisles, more often on large long-haul aircraft.

Probably about 95% of airplanes are flying with something not quite right about them...something deferred, deactivated, temporarily repaired, etc. That's not unsafe, just normal maintenance activity.

Quoting MD11Engineer (Reply 3):
Most airlines today have dispatch reliabilities of bigger than 95%, this means out of 100 departures the plane is delayed for technical reason for 5 departures or less.

Does dispatch reliability include all delays, not just technical ones? In other words, a 95% dispatch reliability might be 3% technical and 2% other stuff.

Tom.
 
MD11Engineer
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RE: How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 7:43 am

Quoting Tdscanuck (Reply 4):
Quoting MD11Engineer (Reply 3):
Most airlines today have dispatch reliabilities of bigger than 95%, this means out of 100 departures the plane is delayed for technical reason for 5 departures or less.

Does dispatch reliability include all delays, not just technical ones? In other words, a 95% dispatch reliability might be 3% technical and 2% other stuff.

Delays get split up based on the reason. It is also quite common to share a delay between several codes, e.g. a technical delay, which was fixed within ten minutes, but caused a plane to miss a slot and forced it to stay on ground for another hour.
We have to supply a written report for any delay where maintenance is involved (even if it is a baggage trolley which hit the plane, in this case we get called to assess the damage and to decide if the plane is airworthy, but the delay is not technical because it was caused by ground handling) if there is a delay of more than 5 minutes.
There are various delay codes, among them serious stuff like a personal delay, e.g. the mechanic is not at the aircraft on time. This can lead to an interview with the manager, no seat offered, no coffee served.
Originally the ideas of delay codes and delay reports were intended to be used as a tool to find shortcomings (e.g. to find out if a station was understaffed or didn't have enough supplies or equipment), but over time it developed into a blame game with one department pushing the responsibility to another. We have to watch like eagles that we don't get delays pushed on us for which we don't carry any responsibility, e.g. pilots causing finger trouble, which we have to sort out or a pilot being late at the aircraft and "inventing" a maintenance delay to cover himself. Our managers again just look at the statistics, where the different stations are being compared, with those managers with the highest dispatch reliability being given bonusses. At most airlines the dispatch reliability for maintenance reasons is somewhere around 98 %.

Jan
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411A
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RE: How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 7:43 am

Having operated (personally) one L1011 last year for Hajj flights, the dispatch reliability of that particular airplane was 99%...not too bad for a twenty four year old airplane...it really depends on the type of maintenance received and the dedication of those operating and servicing the airplane.
 
charlienorth
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RE: How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 10:46 am

Quoting MD11Engineer (Reply 5):
We have to watch like eagles that we don't get delays pushed on us for which we don't carry any responsibility, e.g. pilots causing finger trouble, which we have to sort out or a pilot being late at the aircraft and "inventing" a maintenance delay to cover himself.

I guess it's the same all over,at my co. the crew is supposed to be sitting with their hands in their laps ten minutes prior to push back,all checklist items should have been covered,the cabin crew also must have no gripes,if either do than it belongs to the crew(exception being a late ecam message) another culprit can be the ramp,they might report something "broke" in the pit to put it on mx if it looks like they will have a delay.
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HAWK21M
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RE: How Often Does An Airliner Have Tech Problems?

Mon Sep 24, 2007 7:21 pm

Depending if the snag is defferrable under MEL,or as stated above a damage caused by ground equipment would be termed as non technical delay.

Out here,A delay >15 mins duration due Technical would need detailed reporting to the regulatory authorities too.

regds
MEL
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pilotboi
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RE: How Often Does An Airliner Have Tech Problems?

Tue Sep 25, 2007 1:19 am

If you talking about ASA - about 90% of the time.  Wink
 
n710ps
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RE: How Often Does An Airliner Have Tech Problems?

Tue Sep 25, 2007 8:28 am

Quoting Pilotboi (Reply 9):
If you talking about ASA - about 90% of the time.

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Ha ha, you sir have hit the nail right on the head.
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Tristarsteve
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RE: How Often Does An Airliner Have Tech Problems?

Thu Sep 27, 2007 12:04 am

The technical delay rate for our airline as a whole is about 99.2 per cent. i.e. 99.2 pc of flights are not delayed for technical reasons. Due to the way the MEL is worded, you get slightly more delays at main base, and slightly less away from base. A tech delay is recorded if the plane is late. One minute is enough!. It is pretty constant over time.
 
NWA ARJ
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RE: How Often Does An Airliner Have Tech Problems?

Thu Sep 27, 2007 3:07 am

In Fargo with the Skywest CRJ-200's we would have one or two planes a day that would have mechanical problems.
Nightmare 68, Fargo Tower, Runway 36, Fly Runway Heading, Mantain 10,000, Cleared For Takeoff, Change To Departure
 
ex52tech
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RE: How Often Does An Airliner Have Tech Problems?

Thu Sep 27, 2007 12:36 pm

Quoting NWA ARJ (Reply 12):
In Fargo with the Skywest CRJ-200's

I was exiled to North Dakota by the USAF, and spent a year in Fargo also.........your dispatch reliability problems might have something to do with the fact that it gets so cold up there at times that nothing works.
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NWA ARJ
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RE: How Often Does An Airliner Have Tech Problems?

Fri Sep 28, 2007 6:24 am

Yea but I am refering to this past summer. We had problems every day even when it was 90 degrees out. I just think that the CRJ-200's seem to be aging and the fact the SkyWest runs them non stop all day with little rest at night. But who knows
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ex52tech
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RE: How Often Does An Airliner Have Tech Problems?

Fri Sep 28, 2007 12:27 pm

Quoting NWA ARJ (Reply 14):
Yea but I am refering to this past summer. We had problems every day even when it was 90 degrees out.

Well then, maybe you guys just need a few good mechanics to keep them operating at their best.

But sadly that requires the expenditure of some money. So most airlines would rather "roll the dice", and hope that their aircraft will have a good dispatch reliability this quarter, than hire some good wrenches that could actually give them a good return on their investment.

The industry has gone in that direction, the airlines have adopted the idea, wrongly I might add, that "your job is your reward". Well all I can say is you get what you pay for.
"Saddest thing I ever witnessed....an airplane being scrapped"
 
charlienorth
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RE: How Often Does An Airliner Have Tech Problems?

Fri Sep 28, 2007 10:10 pm

Quoting NWA ARJ (Reply 14):
Yea but I am refering to this past summer. We had problems every day even when it was 90 degrees out. I just think that the CRJ-200's seem to be aging and the fact the SkyWest runs them non stop all day with little rest at night. But who knows

They're susceptible to bleed leaks,aggravated by hot weather.

Quoting Ex52tech (Reply 15):

Well then, maybe you guys just need a few good mechanics to keep them operating at their best.

But sadly that requires the expenditure of some money. So most airlines would rather "roll the dice", and hope that their aircraft will have a good dispatch reliability this quarter, than hire some good wrenches that could actually give them a good return on their investment.

The industry has gone in that direction, the airlines have adopted the idea, wrongly I might add, that "your job is your reward". Well all I can say is you get what you pay for.

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As long as bean counters run things this trend will continue,for some reason the respect for maintenance personnel has dropped to zero,but they still send the work overseas where there is no drug testing or controls on who can work on the aircraft,oh well as long as you can fly coast to coast for $99 it isn't too bad  sarcastic 
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NWA ARJ
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RE: How Often Does An Airliner Have Tech Problems?

Sat Sep 29, 2007 5:59 am

Quoting Charlienorth (Reply 16):
They're susceptible to bleed leaks,aggravated by hot weather.

And that may be but we never had problems with that in Fargo. And it was never the same stuff broken. It was alway something different. So then a contract maintenance worker would come out and try to fix it, and not be able to, and then they would end up ferrying the plane back to Chicago. What a waste
Nightmare 68, Fargo Tower, Runway 36, Fly Runway Heading, Mantain 10,000, Cleared For Takeoff, Change To Departure
 
charlienorth
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RE: How Often Does An Airliner Have Tech Problems?

Sat Sep 29, 2007 11:16 pm

Quoting NWA ARJ (Reply 17):
And that may be but we never had problems with that in Fargo. And it was never the same stuff broken. It was alway something different. So then a contract maintenance worker would come out and try to fix it, and not be able to, and then they would end up ferrying the plane back to Chicago. What a waste

Back when ACA was flying the UAX flights into FAR I showed up for the midday flight,the agent rolled her eye and said the aircraft was broken,she than said this captain seemed to be afraid to fly with passengers and liked break the airplane at out stations and ferry back to ORD,I told her to tell the Junior Birdman that there was a UAL mechanic willing to look at the aircraft,suddenly the flight was re-instated and I never did find out what the "mechanical problem" was
Work hard fly right..don't understand it

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