They should ALL be marked with the correct part numbers. NZCAA legislation follows. It is the easiest I find to navigate online. EASA legislation is (for me) impossible to navigate online!
21.303 Replacement and modification materials, parts, and
appliances
A replacement or modification material, part, or appliance to be installed
into a type certificated product must—
(1) be authorised by the holder of the type certificate for the product
as complying with the type design; or
(2) be manufactured by a person performing maintenance on the
product and the replacement or modification material, part, or
appliance must be —
(i) certified by the person to conform to an approved type
design including any embodied design change; and
(ii) identified in accordance with Subpart Q, or
And for reference, the relevant part of Subpart Q:
21.813 Identification of replacement and modification
materials, parts, and appliances
(a) Except as provided in paragraph (b), each person who manufactures a
replacement or modification part or appliance under an authorisation
required by Subpart K shall, in addition to the identification information
prescribed in 21.805, permanently and legibly mark the part or appliance
with—
(1) the letters ‘NZTSO’ or ‘NZPMA’ as appropriate; and
(2) the name, trademark, or symbol of the holder of the
authorisation; and
(3) the part number; and
(4) the name and model designation of each product issued with a
type certificate or type acceptance certificate, on which the part
is eligible for installation.
(b) Each person who manufactures a replacement or modification
material, part, or appliance under 21.303(2) shall permanently and legibly
mark the material, part, or appliance in such a manner as to ensure it can
be—
(1) identified separately to those otherwise acceptable materials,
parts, and appliances; and
(2) clearly related to its manufacturing data.
(c) If a material, part, or appliance is too small or it is otherwise
impractical to mark the material, part, or appliance with the information
required by paragraphs (a) or (b), the information shall be recorded on a tag
attached to the material, part, appliance, or its container.
(d) Where the marking required by paragraph (a)(4) is so extensive that
to record it on a tag is impractical, the tag attached to the material, part,
appliance, or the container may refer to a specific readily available manual
or catalogue for the name and model designation of each product issued
with a type certificate or type acceptance certificate, on which the material,
part, or appliance is eligible for installation.
Sorry for the long post!
While this is for Type Certified aircraft, it should be relevant to “experimental” aircraft as well as they parts are being manufactured against a known set of technical data (drawings) and need to be marked as such so that they can be identified on the aircraft.
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