AviationAddict
Topic Author
Posts: 622
Joined: Sun Feb 05, 2006 2:37 am

How Much Time Between Aircraft Maintenance Checks?

Tue Apr 10, 2007 10:57 am

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]
 
Mendaero
Posts: 42
Joined: Thu Jul 27, 2006 3:54 pm

RE: How Much Time Between Aircraft Maintenance Checks?

Tue Apr 10, 2007 2:45 pm

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
 
AviationAddict
Topic Author
Posts: 622
Joined: Sun Feb 05, 2006 2:37 am

RE: How Much Time Between Aircraft Maintenance Checks?

Tue Apr 10, 2007 9:40 pm

Thanks very much for your help!
 
User avatar
SEPilot
Posts: 4962
Joined: Sat Dec 30, 2006 10:21 pm

RE: How Much Time Between Aircraft Maintenance Checks?

Tue Apr 10, 2007 10:22 pm

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
 
keesje
Posts: 8748
Joined: Thu Apr 12, 2001 2:08 am

RE: How Much Time Between Aircraft Maintenance Checks?

Tue Apr 10, 2007 11:25 pm

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.

"Never mistake motion for action." Ernest Hemingway
 
BAW076
Posts: 671
Joined: Fri Aug 11, 2006 7:14 am

RE: How Much Time Between Aircraft Maintenance Checks?

Wed Apr 11, 2007 12:44 am

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.
 
TheCol
Posts: 1857
Joined: Wed Jan 03, 2007 9:30 am

RE: How Much Time Between Aircraft Maintenance Checks?

Wed Apr 11, 2007 8:22 am

Most RON flights are checked out by maintenance.
No matter how random things may appear, there's always a plan.
 
User avatar
Jetsgo
Posts: 2696
Joined: Thu Jul 17, 2003 6:31 am

RE: How Much Time Between Aircraft Maintenance Checks?

Wed Apr 11, 2007 9:50 am

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!
 
3DPlanes
Posts: 167
Joined: Thu Apr 27, 2006 11:12 pm

RE: How Much Time Between Aircraft Maintenance Checks?

Wed Apr 11, 2007 12:13 pm

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
 
Tristarsteve
Posts: 3364
Joined: Tue Nov 22, 2005 11:04 pm

RE: How Much Time Between Aircraft Maintenance Checks?

Wed Apr 11, 2007 5:55 pm

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.
 
fr8mech
Posts: 6627
Joined: Mon Sep 26, 2005 9:00 am

RE: How Much Time Between Aircraft Maintenance Checks?

Wed Apr 11, 2007 8:03 pm

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.
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: How Much Time Between Aircraft Maintenance Che

Wed Apr 11, 2007 11:55 pm

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 avatar
Starlionblue
Posts: 17094
Joined: Fri Feb 27, 2004 9:54 pm

RE: How Much Time Between Aircraft Maintenance Checks?

Thu Apr 12, 2007 12:13 am

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." - John Ringo
 
411A
Posts: 1788
Joined: Mon Nov 12, 2001 10:34 am

RE: How Much Time Between Aircraft Maintenance Checks?

Thu Apr 12, 2007 12:57 am

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.
 
Tristarsteve
Posts: 3364
Joined: Tue Nov 22, 2005 11:04 pm

RE: How Much Time Between Aircraft Maintenance Checks?

Thu Apr 12, 2007 1:59 am

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.
 
ReidYYZ
Posts: 503
Joined: Sat Sep 03, 2005 4:00 am

RE: How Much Time Between Aircraft Maintenance Checks?

Thu Apr 12, 2007 3:01 am

Some more times available:
http://airliners.net/discussions/tec...searchid=162499&s=reidyyz#ID162499
As said before, varies by operator.
 
474218
Posts: 4510
Joined: Mon Oct 10, 2005 12:27 pm

RE: How Much Time Between Aircraft Maintenance Checks?

Thu Apr 12, 2007 3:12 am

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

Who is online

Users browsing this forum: WIederling and 12 guests