ROTAX 912 TBO

[barries]

Hi guys,

Can someone please give direction on Rotax 912 S (100 hp) tbo? The engine was fitted in 1999 and currently has around 700 hrs on it.
Apparently there are hour as well as time limitations on these engines.

Will appreciate.

tx

[mulderpm]

Hi Barries,

The best advise is to refer to the Maintenance Manual for your engine. A paper copy comes with your engine, else you can download it from the Rotax Aircraft Engines web site. www.rotaxfly.com.

There are various service intervals. For a list of rubber components and fuel pump, the replacement interval is 5 years. Inspection is 100 hrs or 12 months. TBO for the 912S, with S/N up to and including 4,922.776, is 1200 hrs or 15 years. S/N 4,922.777 to S/N 4,923.889 TBO is 1500 hrs or 12 years. S/N 4,923.890 onwards, TBO is 2000 hrs 15 years.

Cheers,

[Dobbs]

My understanding is that the Rotax manual refers to recommendations, otherwise it is on condition - provided your AP is happy, or am I wrong?

ps - the above only applies to non certified planes

[justin.schoeman]

My understanding is that the Rotax manual refers to recommendations, otherwise it is on condition - provided your AP is happy, or am I wrong?

ps - the above only applies to non certified planes

The Rotax limits are service limitations. The latest revision of the CARs does allow you to ignore these, and maintain an aircraft 'on condition', but they require an AP to create and approve an 'on condition' maintenance schedule. Most APs aren't willing to accept the potential liability of going against the manufactures recommendations though - so you may have trouble finding someone to do it...

[braam hechter]

Good morning All.

Justin, thanks for this info. Below is the regulation that your are referring to.

The important part is that the person signing out the maintenance is taking the responsibility. The owner should make sure that the person is rated for the specific task that he signs out (Appropriately rated). It is often found that a person signs out word done, and then is not rated to have conducted the work.

Part 44.01.16 Overhaul, repair and substitution of major components

44.01.16 (1) Overhaul of a Class I or Class II product and repairs to the primary structure of an aircraft, its engine(s) or propeller(s) shall be signed out by an appropriately rated approved AMO, AME or approved person, in terms of subpart 4 of part 66.
(2) The procedure for the reissuing of a proving flight authority or authority to fly which is deemed to have been suspended when an aircraft is involved in an accident that renders one or more Class I products defective, is prescribed in Document SA-CATS 44.
(3) Where the manufacturer’s instruction or recommendation has not been complied with, such components or equipment must be overhauled as and when their condition shows that it is necessary to keep the aircraft serviceable.
(4) (a) In the case of an aircraft operated in terms of part 94, a component or part may be fitted to an aircraft for which traceable records are not available.
(b) It shall be the responsibility of the appropriately rated approved AMO, AME or approved person, in terms of subpart 4 of part 66, to ensure that the component or part is acceptable in fit, form and function.
(5) (a) Notwithstanding the provisions of subregulation (2), non-type certificated aircraft operated under part 96 or part 141 where the Director or the organisation designated for the purpose in terms of part 149, as the case may be, has approved a time between overhauls that differs from that recommended or specified by the manufacturer, such time between overhauls shall be specified in the aircraft’s accepted maintenance schedule, referred to in regulation 44.03.1.
(b) Furthermore, where a manufacturer has not recommended or specified the overhaul of an item at certain times but where the Director or the organisation designated for the purpose in terms of part 149, as the case may be, considers its overhaul at certain intervals necessary in the interest of safety, he or she may prescribe a time between overhauls for such item in the aircraft’s accepted maintenance schedule.
(c) The requirements for the substitution of products, components and parts with new or overhauled items are those prescribed in Document SA-CATS 24.
(d) No part may be fitted to an aircraft for which traceable records are not available. The appropriately rated approved AMO, AME or approved person, in terms of subpart 4 of part 66, is responsible for ensuring that any part received comes from a reliable source and is serviceable, and that the storage limitations have not been exceeded. Substitutions must be certified by the holder of an appropriately rated licence or authorisation.

I trust this will help.

Greetings

Braam Hechter

[barries]

Hi Guys,

Thanks for the info.

It however does not make sense at all that an engine has a shelf live. Obviously the hour limitation makes sense and that rubber components may deteriorate with time, but steel wil not.

You will also have an uphill battle to get the AP to sign it off as he has in most cases potentially a vested interest in overhauling the engine.

But I suppose this is the regulation and we will have to abide by it...

Regards