Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Engine Overhaul Intervals  
User currently offlineAirxliban From Lebanon, joined Oct 2003, 4536 posts, RR: 52
Posted (5 years 11 months 1 week 11 hours ago) and read 7064 times:

Can someone tell me what the overhaul intervals are for the following engines?

CFM56-3, -5, -7
CF34-3, -8

I have some data which suggests that overhaul for the CFM56 is every 10,000 hours, but that sounds quite low to me and I'm also not sure whether the same interval would apply for the -3 and the -7 which as I understand it are rather different engines. If the interval is every 10,000 hours I guess that means that an engine for a big carrier like Southwest which must do 3,000 hours a year would go for overhaul in every 3-4 years, which strikes me as being too frequent.

Any insight would be much appreciated?

3 replies: All unread, jump to last
User currently offlinetdscanuck From Canada, joined Jan 2006, 12710 posts, RR: 78
Reply 1, posted (5 years 11 months 1 week ago) and read 6998 times:

Quoting Airxliban (Thread starter):
Can someone tell me what the overhaul intervals are for the following engines?

The -7 is on an MSG3 maintenance program (I suspect the -5 is as well, but I'm not positive), so it doesn't have *an* overhaul interval, it's just got a ton of tasks with different intervals. They range everywhere from 50 hours to the lift limits on some of the parts. Major blocks of tasks come due at 1200/1600/2400/5000/6000/7500 hours.

The first thing that would require you to pull the engine, assuming you can pass all the intervening inspections, is the first buried part with a life limit.


User currently offlineMarkC From United States of America, joined Apr 2006, 259 posts, RR: 0
Reply 2, posted (5 years 11 months 6 days 16 hours ago) and read 6945 times:

You're talking about an engine shop visit, right? This is where the engine is removed from the wing and sent to an overhaul shop. Its based on cycles, not necessarily hours. And, you are correct, I would say the CFMs on Southwest are going to be about every 3 - 4 years. The only CFMs I have worked on were from an atypical operator, and had longer intervals at the tradeoff of a much higher overhaul cost. PW4000's on longhaul aircraft go about 2,000 - 2,500 cycles between shop visits (baring an AD or parts failure). But, that could be many years.

User currently offlinermm From Australia, joined Feb 2001, 527 posts, RR: 1
Reply 3, posted (5 years 11 months 4 days 20 hours ago) and read 6825 times:

When I worked in the shop (many years ago) on the CFM56-3 the first cyclic lifed item was the HPT front shaft. On early models it was changed IIRC at 12,800 cycles although only one engine was actually removed when I worked on the shop floor due to the time expired part, most others ran out of EGT margin before making 12,800 cycles.

[Edited 2010-07-03 00:14:33]

[Edited 2010-07-03 00:14:55]

Top Of Page
Forum Index

Reply To This Topic Engine Overhaul Intervals
No username? Sign up now!

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!
Add Images Add SmiliesPosting Help

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

Similar topics:More similar topics...
Deciding Factors In Engine Choice+Overhaul Q'tion posted Sun Oct 26 2008 15:03:37 by SInGAPORE_AIR
DC3 Engine Out Performance posted Mon Jun 21 2010 07:04:36 by TravelAVNut
The 'Engine Start Procedure' posted Mon Jun 21 2010 03:14:01 by BeakerLTN
A340-300 Does It Get The Same Engine Upgrades? posted Fri Jun 18 2010 02:32:55 by parapente
Engine Rotation And Thrust Questions posted Thu Jun 17 2010 17:32:24 by CFBFrame
Exhaust Speed At Back Of Turbofan Engine posted Wed Jun 16 2010 03:43:52 by smartt1982
BPR, Core Size, And The 737 Re-engine posted Fri Jun 11 2010 11:27:55 by voltage
Take Off With Faulty Engine? I Was There! posted Sun May 30 2010 20:24:33 by danild
Rolls Royce Engine posted Wed May 26 2010 08:40:38 by Claude
Do Jet Powered Aircraft Have A "critical Engine?" posted Mon May 17 2010 08:06:43 by Northwest727

Sponsor Message:
Printer friendly format