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How Much Time Between Aircraft Maintenance Checks?  
User currently offlineAviationAddict From United States of America, joined Feb 2006, 630 posts, RR: 0
Posted (7 years 8 months 2 weeks 2 days 11 hours ago) and read 29627 times:
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Just curious to know how much time there is between each major maintenance check for most commercial aircraft. I'm especially interested in the D checks, which seem to be the magic ones in terms of paint jobs. I'm sure the time frame is different for every make/model/airline, but can anyone give me a rough estimate? Thanks.

[Edited 2007-04-10 03:57:49]

16 replies: All unread, jump to last
 
User currently offlineMendaero From Australia, joined Jul 2006, 62 posts, RR: 0
Reply 1, posted (7 years 8 months 2 weeks 2 days 7 hours ago) and read 29581 times:

It can be different for every airline, however my airline with our 747-400 aircraft do check intervals at:

'A' checks every 750hrs

Super 'A' checks ????

'C' checks every 18 months

'D' checks every 5 years approx

Our 767's:

'A' checks every 600hrs

half 'C' check ????

'C' checks every 18 months

we dont do 'D' checks on 767's, however we do 'SC' (structural C) checks that if I remember correctly would altenate on which area of the aircraft the structural inspection's would take place.

We don't re-paint our Aircraft during any check. They are sent to a paint facility and are less frequent than 'D' checks.

Regards Mendaero


User currently offlineAviationAddict From United States of America, joined Feb 2006, 630 posts, RR: 0
Reply 2, posted (7 years 8 months 2 weeks 2 days ago) and read 29517 times:
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Thanks very much for your help!

User currently offlineSEPilot From United States of America, joined Dec 2006, 7132 posts, RR: 46
Reply 3, posted (7 years 8 months 2 weeks 2 days ago) and read 29490 times:

Quoting Mendaero (Reply 1):
we dont do 'D' checks on 767's, however we do 'SC' (structural C) checks that if I remember correctly would altenate on which area of the aircraft the structural inspection's would take place.

I thought D checks were mandatory-are the Australian rules different? What's the difference between a D check and a SC check?



The problem with making things foolproof is that fools are so doggone ingenious...Dan Keebler
User currently offlineKeesje From , joined Dec 1969, posts, RR:
Reply 4, posted (7 years 8 months 2 weeks 1 day 23 hours ago) and read 29440 times:

By studying the maintenance programs carefully, negotiating with Boeing and the authorities airlines will be allowed to stretch the maintenance intervals. A lot of "paperwork" procedures, proven pratices & track record are the bases of it all.

KLM E&M has gotten 8 years maintenance intervals on the 747-400 (or equivalent flight hours). Not being one of the cheapest maintenance providers smart customized maintenance programs helped them to close long term contracts with new 747-400 operators like Jade, TNT and Martinair and existing ones like Cargolux, Atlas and Virgin Atlantic.



User currently offlineBAW076 From UK - Scotland, joined Aug 2006, 750 posts, RR: 26
Reply 5, posted (7 years 8 months 2 weeks 1 day 21 hours ago) and read 29391 times:

Hi,

Excuse my lack of knowledge here but could someone explain the difference between A, C and D checks?

Many thanks in advance,
BAW076



N754AN (x2), G-CPEL, G-MIDE, G-BPEC, G-BZHC, EI-DCH, LN-KKN, G-VIIW, G-BNLT, G-DBCA, G-MEDE, G-DBCE, G-MIDP.
User currently offlineTheCol From Canada, joined Jan 2007, 2039 posts, RR: 6
Reply 6, posted (7 years 8 months 2 weeks 1 day 14 hours ago) and read 29279 times:

Most RON flights are checked out by maintenance.


No matter how random things may appear, there's always a plan.
User currently offlineJetsGo From United States of America, joined Jul 2003, 3086 posts, RR: 5
Reply 7, posted (7 years 8 months 2 weeks 1 day 12 hours ago) and read 29271 times:

Quoting BAW076 (Reply 5):
explain the difference between A, C and D checks?

I am interested in this too. Thanks in advance.



Marine Corps Aviation, The Last To Let You Down!
User currently offline3DPlanes From United States of America, joined Apr 2006, 167 posts, RR: 0
Reply 8, posted (7 years 8 months 2 weeks 1 day 10 hours ago) and read 29249 times:

Quoting BAW076 (Reply 5):
Hi,

Excuse my lack of knowledge here but could someone explain the difference between A, C and D checks?

Many thanks in advance,
BAW076



Quoting JetsGo (Reply 7):
I am interested in this too. Thanks in advance.

There is a site that explains them, though I can't recall it offhand. Or search the forum, it has been discussed numerous times before. (That's where I first saw the link to begin with...)


I'm more interested in the painting intervals. Mendaero seems to be suggesting that the planes are painted less than once every five years? Seems like a long time to wait... Especially given some of the wear I've seen on some schemes.

Anybody have other painting frequency info (assuming the livery doesn't change...)???



"Simplicate and add lightness." - Ed Heinemann
User currently offlineTristarSteve From Sweden, joined Nov 2005, 4069 posts, RR: 33
Reply 9, posted (7 years 8 months 2 weeks 1 day 4 hours ago) and read 29218 times:

Quoting BAW076 (Reply 5):
Excuse my lack of knowledge here but could someone explain the difference between A, C and D checks?

basically the complexity rises from A to D.
An A check will be accomplished overnight, while a D check will take a couple of weeks in a hangar.
We start with daily checks, then weekly checks, then a check A about every month. These are all performed overnight usually on the ramp.
Then there are C checks. Different airlines split these up and package them depending on their flying pattern and the number of aircraft they have. C Checks can be actioned in a package in a day, or take a week. Really depends on the airline. It is possible to split the C check into small packets and do it overnight, with a longer input every now and then for jobs that take longer. Or if you have to fly the aircraft away for a C check, then it might be a large package every two years.
Then the big check is a D check where the aircraft is dismantled by a large team and will take at least two weeks, and often longer. Usually actioned in a special facility that specialises in this work.
Whole aircraft painting is done in a special paint bay, and is not connected with these checks. A life of around 10 years is a good guess.


User currently offlineFr8Mech From United States of America, joined Sep 2005, 5654 posts, RR: 15
Reply 10, posted (7 years 8 months 2 weeks 1 day 2 hours ago) and read 29204 times:

Check time limits and intervals are spelled out in the operator's Maintenance Specification Manual. These intervals are approved by the FAA and the manufacturer. The airline can 'buy' the manufacturer's package or build their own based on current operating data and trends. Again, approved by the FAA.

Everyone is different. Example: we don't do D checks. All our C checks have a piece of the D check package incorporated. This means that the C check may take longer to perform, but we will not loss an aircraft for 1 or 2 months to a D check. I used to work in the D check at Pan Am. Those things can take from 3 weeks to 2 or 3 months depending on the workscope, age of aircraft and findings.


Painting has nothing to do with the checks. Usually paint is evaluated for condition and touched up or redone as required. I'd say 5 - 8 years is a good range.



When seconds count...the police are minutes away.
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 11, posted (7 years 8 months 2 weeks 22 hours ago) and read 29186 times:

Quoting Fr8Mech (Reply 10):
Everyone is different. Example: we don't do D checks. All our C checks have a piece of the D check package incorporated. This means that the C check may take longer to perform, but we will not loss an aircraft for 1 or 2 months to a D check. I used to work in the D check at Pan Am. Those things can take from 3 weeks to 2 or 3 months depending on the workscope, age of aircraft and findings



 checkmark 

Most accurate in vast majority of cases I've seen in 23 years in the industry.

[Edited 2007-04-11 16:58:08]

User currently offlineStarlionblue From Greenland, joined Feb 2004, 17173 posts, RR: 66
Reply 12, posted (7 years 8 months 2 weeks 22 hours ago) and read 29180 times:

Quoting SEPilot (Reply 3):

I thought D checks were mandatory-are the Australian rules different? What's the difference between a D check and a SC check?

As described by Fr8Mech below:

Quoting Fr8Mech (Reply 10):
Everyone is different. Example: we don't do D checks. All our C checks have a piece of the D check package incorporated. This means that the C check may take longer to perform, but we will not loss an aircraft for 1 or 2 months to a D check



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offline411A From United States of America, joined Nov 2001, 1826 posts, RR: 8
Reply 13, posted (7 years 8 months 2 weeks 21 hours ago) and read 29168 times:

Typical maintenance checks required/used by several L1011 operators.

A check, completed every 150 hours

B check, completed every 300 hours

C check completed every 3000 hours, calendar time limit varies by operator*

Time exceedance allowed, +10% hours.

There was one original operator of L1011 aircraft that I'm aware of that had the C check interval at 4200 hours, with no calendar time limit....British Airways.
When some of these aircraft were converted into freighters and sold to American International, the maintenance check schedule was retained.


User currently offlineTristarsteve From Sweden, joined Nov 2005, 4069 posts, RR: 33
Reply 14, posted (7 years 8 months 2 weeks 20 hours ago) and read 29155 times:

Quoting 411A (Reply 13):
There was one original operator of L1011 aircraft that I'm aware of that had the C check interval at 4200 hours, with no calendar time limit....British Airways.

Maybe at the end, but I was on BA Tristars at the beginning. At the time the Trident was maintained on overnight maintenance up to the every two years (or so) Major check.
So when the Tristar arrived they tried to do the same.
We had check A every 300 hours, with an enhanced 2A at 600 hrs, then another A at 900 hrs then an Overnight 1/3 C check at 1200 hrs., which meant the whole C check was at 3600hrs. But these overnight mini C checks were very unreliable, and frequently overran into the following afternoon! The guy that decided that he could do a Tristar check in the time that he did a Trident check was sorely mistaken! He didn't realise the amount of work that crops up on an aircraft 3 times the size.


User currently offlineReidYYZ From Kyrgyzstan, joined Sep 2005, 536 posts, RR: 0
Reply 15, posted (7 years 8 months 2 weeks 19 hours ago) and read 29144 times:

Some more times available:
http://airliners.net/discussions/tec...searchid=162499&s=reidyyz#ID162499
As said before, varies by operator.


User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 16, posted (7 years 8 months 2 weeks 19 hours ago) and read 29141 times:

411A & Tristarsteve,

From the L-1011 Maintenance Review Board Report (MRB):

"A" Check required every 300 flight hours, but can be extended to 350 hours after the operator has accomplished its first C1 Check.

"C" Check required every 3000 flight hours or 13 months but can be extended for a period not to exceed 15 months.

These requirements were for new operators, after the operator could prove to the regulatory agency that their maintenance program was capable of maintaining the aircraft in a airworthy condition these could be extended.

Carl


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