Engine type-change in factory built aircraft?

[Philster2001]

If an aircraft manufacturer offers a range of different engine types with their aircraft from the factory, is it permissible under the regulations to change the engine to a different type after the aircraft is registered (24 rego), as long as the new engine is one of those which can be delivered from new by the factory?

 

 

[facthunter]

I would imagine all the installation details would have to comply so that it was identical to the factory supplied item. ( Just an opinion) .Nev

 

 

[Dafydd Llewellyn]

The normal situation in GA is that the organisation doing the job would need to assemble a package of "Approved data" (See CAR 2A) that fully covered the job - AND the aircraft Flight Manual would also need to cover the alternative engine version. You do come across this situation with some Cessnas; the TCDS sometimes lists alternative engines. Then you have to go to the Parts Catalog and make sure every part of the engine installation plus any relevant placards, is correct for the new engine. The change may or may not warrant re-weighing. Unless all this is covered, it is necessary to get an approval. In the past, lots of changes of this sort were approved under CAR 35; the extent to which they can be approved under CASR 21M will depend on whether or not the mod. is considered "Major" - but if it's listed in the TCDS, I would not expect it to be considered "major" - but I'm not current on CASA policy in this regard.