English French German Italian Portuguese Spanish Swedish

 

Running on Condition

  • rspall
  • rspall's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
3 months 2 weeks ago #19850 by rspall
Running on Condition was created by rspall
Folk,

As per usual, looking to benefit from your invaluable experience...

My Rotax 912ULS will be celebrating its 12 birthday next year - not sure which month, but the Serial # is 5648209 with gearbox #35138 - in case anyone can get me more detailed information ?

Anyway, it has 190 hours on the engine, and along with the aircraft, it spent 3 years in storage 2014, 2015, 2016. It flew 12 hours last year and so far 15 hours this year. Except for storage years, it has had yearly oil changes, although its coolant was changed for first time this year! All fuel hoses were changed last year, and coolant hoses were changed this year. Finally, I am planning on overhauling the carburetors this winter.

Other than that, there has been no other maintenance forward of the firewall. The carburetors were balanced last year and rechecked again this year. It has always run on Unleaded, non ethanol MOGAS. The spark plugs and air filter were changed this year. I did a leak down test before I put away for winter last year and got 79/80 for every cylinder, along with 160 - 165 direct compression on each cylinder. Finally the last oil filter change saw no debris in the cut open filter, and the the magnetic plug had very minor debris.

So...

A local Rotax mechanic (and certified Canadian Aircraft mechanic) who checks over the aircraft every year says that Rotax 912's are 'bullet proof', and provided they are looked after correctly, they easily go well beyond 12 years TBO!

I am hoping to run the engine 'on condition' during its teenage years, and hopefully it will not be as troubling as most teenagers!. It is installed in a Canadian Advanced Ultralight aircraft, and therefore has no formal TBO requirements. However, safety is important, so does anyone have any advice on changes to maintenance schedule, or additional engine procedures that I should follow once it has gone past its 12 year TBO? I want straight talk, even if that means folk recommending not running on condition and replacing with a new engine - I have been told that is cheaper than an overhaul!

For example, should I start doing laboratory oil analysis on every oil change, etc?

Any suggestions / advice appreciated.

Roger

Please Log in or Create an account to join the conversation.

More
3 months 2 weeks ago #19855 by alananpat
Replied by alananpat on topic Running on Condition
Hi Roger,

I'm in almost the same situation as you. I am doing my 11th annual now. With 12 years and 834hrs, I asked the tech center at Lockwood about what will go wrong after 12 years in service and was told it will be seals. I have already had to replace the coolant fitting orings on top of the heads so I can agree on that part. All the rubber is always replaced on a 5 year schedule. I'm going to run on condition until the engine is no longer serviceable and replace with new as I believe the cases must be replaced for my 2006 model engine during overhaul.

Let's see what the other Roger says.

Alan

Please Log in or Create an account to join the conversation.

  • Roger Lee
  • Roger Lee's Avatar
  • Away
  • Administrator
  • Administrator
More
3 months 2 weeks ago #19856 by Roger Lee
Replied by Roger Lee on topic Running on Condition
This can be one of those topics where one side wants the TBO followed and the other side likes the on condition side.

I like the on condition side provided that owners have been doing their preventive maint. over the life of the engine. I have many friends that are doing on condition.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

Please Log in or Create an account to join the conversation.

  • rspall
  • rspall's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
3 months 2 weeks ago #19868 by rspall
Replied by rspall on topic Running on Condition
Alan,

I am in same position with case needing replacement. So I will simply follow all preventative maintenance schedules and keep a close eye on cylinder pressures, leaks, rubber, and for metallic debris in oil filter changes (and magnetic plug).

Hopefully I can get another 10 years :-)

Roger

Please Log in or Create an account to join the conversation.

More
1 week 2 days ago #20762 by xcropduster
Replied by xcropduster on topic Running on Condition
At what serial number was the crank case material changed in 2006?

Please Log in or Create an account to join the conversation.

  • Roger Lee
  • Roger Lee's Avatar
  • Away
  • Administrator
  • Administrator
More
1 week 2 days ago #20763 by Roger Lee
Replied by Roger Lee on topic Running on Condition

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

Please Log in or Create an account to join the conversation.

More
1 week 1 day ago #20766 by xcropduster
Replied by xcropduster on topic Running on Condition
Thanks Roger.
After reading SB-912-057UL I am still confused as to the status of engine SN 5646671. Section 1.1 seems to indicate that the crankcase change occurred at SN 6,775.790 for a 912ULS but section 3.4.1 would indicate a crankcase change at 5,646.559.
Can you help me better understand this SB.
Thanks,
Jim

Please Log in or Create an account to join the conversation.

  • Roger Lee
  • Roger Lee's Avatar
  • Away
  • Administrator
  • Administrator
More
1 week 1 day ago - 1 week 1 day ago #20768 by Roger Lee
Replied by Roger Lee on topic Running on Condition
You're good to go by just 112 engines. You qualify for the extension. You will need to replace the oil pressure plug screw and spring and then make sure all this gets documented in the logbook.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last edit: 1 week 1 day ago by Roger Lee.
The following user(s) said Thank You: xcropduster

Please Log in or Create an account to join the conversation.

More
1 week 14 hours ago #20778 by xcropduster
Replied by xcropduster on topic Running on Condition
Thanks Roger for your invaluable expertise.

Please Log in or Create an account to join the conversation.