'On Condition'
 

Hi

Can somebody explain to me what it means to run a Rotax 912 'on condition' once past the 2000 hours required for TBO?

It basically means you can run if on condition it remains serviceable!

You keep running it until it stops.

Then it is not on condition!

It's on condition that it still works...:)

I don't know specifically about the Rotax, but generally there are service limits on the engine that will be checked at 100 hour or annual intervals.
Those will typically cover oil consumption, compression checks etc and anything mandated by the manufacturer.

In practical terms it depends on what the engine is fitted to - whether it is CofA or permit, and if on a permit whether the permit is administered by the LAA, BMAA or the CAA. They all have different rules.

On condition
 

It means there is no need for scheduled overhaul and you 'fix faults when they happen'

Doesn't it compromise safety?

No it doesn't.

I agree. This article is worth a read:

EAA Sport Aviation - February 2010

Is it legal (in EASA country) to use an on condition engine commercially, for example in a rental plane?

In the UK, extension of up to 20% is allowed on condition for public transport or aerial work. Beyond that only for private use ( exception allowed for glider tugs)

Covered by CAP 747 GR 24

This is known as operating 'On Extension'. (I dont think that Rotax engines are allowed to be 'Extended'.) Any further operation after any 'Extensions' to the hours, or calendar times are used up, is known as operating 'On Condition'.


Yes :)

No :(


MJ:ok:

which engine exactly? 912, 912UL. 912S, 912ULS ?
on what category of plane? p2f? certified?
on which national reg?

Here's another Mike Busch article on the subject that's worth a read:

How Do Piston Aircraft Engines Fail? « Opinion Leaders

its a 912UL in a BMAA permit aircraft