Jaba-whoooooooooooo is right on the money there.
Okay, so we're only talking VH experimental aircraft, not RAAus.
Instrument number CASA 15/16: Authorisation of persons to carry out maintenance and issue maint release
Para 2 definitions:
Primary builder (a) is referring to one member of a group (of 2 or more) who has done more than half the aircraft themself.
eg 1. Person 1 has done 60%. Person 2 has done 40%
eg 2. Person 1 has done 51%, person 2 has done 10%, person 3 has done 10%.
Percentages are all subjective. Keep it simple. In the group, who, if anyone, did at least 51%? That is the primary builder. If nobody did (individually) at least 51%, move to the next clause (b).
Primary builder (b) is referring to one member of a group (of 2 or more) who has been nominated as the leader, in effect, because no one person within the group fitted into the previous clause by doing at least 51%, alone.
eg 1. Person 1 and Person 2 do equal amounts, they always work together. Neither has done more than 51% individually. So one person must be nominated as the leader, to issue the maintenance release.
Para 3 describes who 15-16 applies to,
(a) a person (solo, or in a group) who has done more than 51% of the project, or
(b) a person (generally, in a group) who contributed to the project.
Para 4 describes who is authorised to carry out maintenance:
(a) the person in 3(a) - a person who has done more than 51% of the project, and
(b) a person in 3(b) - a person who contributed to the project (ie – the group situations).
Schedule 1 condition 7 describes that a person in 3(b) – the group member(s) may only maintain those parts they built.
Example 1 – Fred solely built the tailplane and elevators, fin and rudder. Barney did everything else. Fred can only maintain those parts he built. Can Barney maintain Fred’s work? No, he’s in the same boat. Fred though, has been nominated as the primary builder to issue the M/R. Could equally have been Barney. % plays no part.
Example 2 – Fred and Barney built everything, together. Both Fred and Barney can maintain everything. But only one of them – the nominated primary builder - gets to issue the maintenance release! This time, Barney has been nominated as the primary builder, to issue the M/R. Could equally have been Fred.
Best solution: Each group member contributes to each part of the project for maintenance purposes (but still only one is nominated to issue the M/R). What if the M/R person leaves the group? Can a new nomination be done before they leave? Don’t see why not, the reg doesn’t say when the nomination must occur. Maintenance may become a problem if one person leaves. Gee it gets complicated doesn't it?
Well that's one topic well and truly hijacked from the starting topic, can you employ someone to build your JetBlaster 5000?
Does it happen? Yes. Does CASA know it happens? Yes. Should it happen? No.
Builders must always be able to provide proof (builders log, in-action photos, inspection visits) to their AP that they themselves built the aircraft. The AP can ask for a stat dec if still not satisfied, and BSing on one of those is serious business. And if still not satisfied, the AP can write it up as "LAME ONLY" maintenance (to protect third parties on the ground who are not involved). If it gets to that stage, you already know you are trying to cheat the system. If you are not trying to cheat the system, you can easily gather the proof of build as you go. It's not rocket surgery.
I hope that this is of some use to folks. I also hope it's accurate! Should be, I been doing this quite a while.
There are always unanswered questions remaining, and some of them are also unanswerable (other than "NFI") There are too many "what ifs" that will fit in one box.