He can't even apply for an airworthiness certificate, let alone the repairman. Throwing together already built parts of other aircraft is not sufficient to be seen as the 51% required for an E-AB certificate.
Well, if they were parts from certificated aircraft yuppie duppie:
https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_20-27G.pdf
"Use of Salvaged Assemblies from Type-Certificated Aircraft.
The use of
used or salvaged assemblies
(for example, landing gear, horizontal stabilizer, and
engine mount) from type-certificated aircra
ft is permitted, as long as they are in a
condition for safe operation. However—
(1)
You should contact your local FAA
MIDO or FSDO prior to using a
major assembly or subassembly, such as wings, fuselage, or tail assembly from a
type-certificated aircraft. As an amateur
builder, you should be awar
e that when building
your aircraft, the excessive use of majo
r assemblies or subassemblies from type-
certificated aircraft would most likely
render it ineligible for certification under
§ 21.191(g).
(2)
You will not receive credit for work d
one on, or the use of, salvaged major
assemblies or subassemblies when determining whether your amateur-built aircraft has
met the major portion requirement. This woul
d include any “rebuilding” or “alteration”
activities to return these compone
nts to an airworthy condition.
(3)
All fabrication, installation, and assembly tasks on the Amateur-Built
Aircraft Fabrication and
Assembly Checklist (2009)
that you’ve completed by the use of
used or salvaged assemblies can only be annotated in the “Mfr Kit/Part/Component”
column."
Ifen someone bought parts from previously certificated as having been built by amateurs aircraft - it is perhaps a little grey?
"Buying an Aircraft Built From
a Partially Completed Aircraft Kit.
If
you buy an aircraft built from a partially comp
leted kit, you should get all fabrication and
assembly records, such as receipts for mate
rials, the builder’s log, and aircraft, engine,
propeller logbooks, and any other documentati
on available (see paragraph 7h) from the
previous owner. You should add the construction efforts of the previous amateur builders
to your builder’s log to show the construction
history of the kit. This information will
help us to determine whether your complete
d aircraft is eligib
le for amateur-built
certification"
and
"If you buy a
partially built aircraft built from a plan,
you should get all fabrication and assembly
records, such as receipts for materials,
the builder’s log, and
aircraft, engine, and
propeller logbooks, from the previous owner.
You should add the construction efforts of
the previous amateur builders to
your builder’s log to show th
e construction history of the
aircraft. This information may help us to
determine that your aircraft is eligible for
amateur-built certification (see to para
graph 8b(5) for more information)."
The work can be done by "other amateurs" as long as the work was actually done by amateurs and not just "supervised" by an amateur. And, you would have to list all of the previous "amateurs" on the application for the airworthiness certificate.
"You may receive
commercial educational assistance in the fabric
ation or assembly of specific parts and the
completion of certain tasks or processes invo
lved in the construction of your aircraft.
The FAA may credit commercial educational assistance provided for educational
purposes toward the major portion determina
tion. However, commercial educational
assistance cannot exceed a demonstration on
how to perform the task. You, as the
amateur builder, must still perfor
m the task to receive credit."
For the repairman's certificate the question would, I think depend on of you got a new data plate and airworthiness certificate that is unique and not from one of the donor aircraft.
"The prim
ary builder of your aircraft,
even as the second builder, and can
satisfactorily prove to us that you can determin
e whether the aircraft
is in a condition for
safe operation.
b.
One of the builders of an amateur-built ai
rcraft registered in a corporation’s
name. The applicant should prove through us
e of the builder’s log that they can
determine whether the aircraft is
in a condition for safe operation."
