Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Scheduling Maintenance Checks  
User currently offlineVikingA346 From Sweden, joined Oct 2006, 515 posts, RR: 0
Posted (4 years 5 months 3 weeks 3 days ago) and read 2804 times:

Hello,

Can somebody please advise me on this:

In determining a maintenance schedule, as airraft build up flight hours, they must be scheduled for their appropriate A, C, D checks etc...

If an aircraft is scheduled to undergo a "C" check at every 3000 flight hours, does this check have to be done BEFORE reaching 3000 FH or can it be done a bit after? What is the flexibility with this in terms of regulatory bodies?

Is it +10%, so must be done before 3,300 hours? Please reference where this information is stated. I'm doing my own maintenance schedule for a virtual airline and this information is crucial.

Thank you!

VikingA346


...you will walk the earth with your eyes turned skyward, for there you have been and there you shall return
4 replies: All unread, jump to last
 
User currently offlineTristarsteve From Sweden, joined Nov 2005, 4009 posts, RR: 33
Reply 1, posted (4 years 5 months 3 weeks 2 days 22 hours ago) and read 2783 times:

Yes. The plan is that it must be done before 3000hrs.
However getting a 5pc extension is easy, but must be applied for.

It can get complicated.
When I did a bit of planning, I looked after the Nordic East Tristars at ARN.
We had a maint opportunity for one aircraft a week.
The A check was 300 hrs, then a 2A check at 600 hrs, then an A check at 900 hrs. then a C segment at 1200hrs.
We did the A and 2A at ARN, but the C at LHR.
The trick is to use up all the hours, but not go over. If you did the A checks 50 hrs early, then you would lose 150hrs of the C check. But the aircraft could fly over 60 hrs a week. So it involved close cooperation with OPS to get the aircraft to accumulate the right hours to the next A check window.
Then one broke down, and the wrong one accumulated hours and we had to do an A check on the wrong day, which meant we had to hire loads of mechanics to get it done quicker than normal.
Not only that, we had to fly out a test set and an engineer from LHR for each 2A check.
Now try that with 40 aircraft.


User currently offlineDALMD88 From United States of America, joined Jul 2000, 2554 posts, RR: 14
Reply 2, posted (4 years 5 months 3 weeks 2 days 22 hours ago) and read 2783 times:

If I recall correctly you are allowed to run over 10%. You don't gain the 10%. The next check limit is measured from when the runover was due. I think you also need to get FAA permission. If you do it too much they can deny the request.

User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 79
Reply 3, posted (4 years 5 months 3 weeks 2 days 17 hours ago) and read 2730 times:

Quoting VikingA346 (Thread starter):
In determining a maintenance schedule, as airraft build up flight hours, they must be scheduled for their appropriate A, C, D checks etc...

That's only for airplanes that are on letter-check maintenance plans. Everything since about the mid-90's is done on the MSG3 maintenance model, which proscribes individual hours/cycles for each task. Airlines can group these into the conventional A/B/C/D checks, or do phased checks where they do a periodic visit (nightly, each weekend, whatever) with different tasks on each visit.

Quoting VikingA346 (Thread starter):
If an aircraft is scheduled to undergo a "C" check at every 3000 flight hours, does this check have to be done BEFORE reaching 3000 FH or can it be done a bit after?

Depends on the maintenance plan in the airline's operation specification.

Quoting VikingA346 (Thread starter):
What is the flexibility with this in terms of regulatory bodies?

Depends on the plan, the ops spec, and which regulatory body we're talking about.

Quoting VikingA346 (Thread starter):
Is it +10%, so must be done before 3,300 hours?

In places that do the 10%, it's generally a hard limit.

Quoting VikingA346 (Thread starter):
Please reference where this information is stated.

The OEM recommendation comes from the MPD (Maintenance Planning Document) for each model. Each airline uses this as the basis for their individual maintenance plan, which is certified as part of their operations specification. The ops spec is the official document for any particular airline. Some airlines will just say "Use the OEM maintenance plan", some will completely redo it essentially from scratch.

Quoting DALMD88 (Reply 2):
If I recall correctly you are allowed to run over 10%. You don't gain the 10%. The next check limit is measured from when the runover was due.

That is my experience as well.

Tom.


User currently offlineAA737-823 From United States of America, joined Mar 2000, 5822 posts, RR: 11
Reply 4, posted (4 years 5 months 3 weeks 1 day ago) and read 2628 times:

At my carrier, it's a hard limit. That said, you can contact the FAA and request an extension until a certain point in time, and they're generally very cooperative, so long as you're asking something reasonable!

Top Of Page
Forum Index

Reply To This Topic Scheduling Maintenance Checks
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Cost Of Maintenance Checks posted Thu Oct 11 2007 06:11:30 by Nycbjr
How Much Time Between Aircraft Maintenance Checks? posted Tue Apr 10 2007 03:57:14 by AviationAddict
Maintenance Checks Deciphered? posted Mon Dec 5 2005 17:47:35 by DeltaGator
How Are Planes Tested After Maintenance Checks? posted Sun Aug 21 2005 00:06:26 by Comorin
Maintenance Checks posted Sat Jun 2 2001 17:51:34 by PHLyBoy
Medical Checks - Maintenance posted Fri Nov 21 2008 22:19:52 by HAWK21M
C-checks And Your Airline's Maintenance Program posted Sat Jul 17 2004 02:21:54 by Modesto2
Airline Maintenance Outsourcing posted Mon Mar 29 2010 04:38:11 by vikinga346
Rearview Mirrors For In-flight Engine Checks? posted Wed Mar 17 2010 08:26:51 by alwaysontherun
MIA Cargo Startup-Maintenance Co$ts On 727-200ADV? posted Tue Mar 2 2010 16:46:57 by Merlot

Sponsor Message:
Printer friendly format