174
14 CFR Ch. I (1–1–24 Edition)
§ 21.618
as FAA approved with the manufactur-
er’s part number and name, trademark,
symbol, or other FAA approved manu-
facturer’s identification;
(f) Have access to design data nec-
essary to determine conformity and
airworthiness for each article produced
under the TSO authorization. The man-
ufacturer must retain this data until it
no longer manufactures the article. At
that time, copies of the data must be
sent to the FAA;
(g) Retain its TSO authorization and
make it available to the FAA upon re-
quest; and
(h) Make available to the FAA infor-
mation regarding all delegation of au-
thority to suppliers.
§ 21.618
Approval for deviation.
(a) Each manufacturer who requests
approval to deviate from any perform-
ance standard of a TSO must show that
factors or design features providing an
equivalent level of safety compensate
for the standards from which a devi-
ation is requested.
(b) The manufacturer must send re-
quests for approval to deviate, together
with all pertinent data, to the FAA. If
the article is manufactured under the
authority of a foreign country or juris-
diction, the manufacturer must send
requests for approval to deviate, to-
gether with all pertinent data, through
the civil aviation authority of that
country or jurisdiction to the FAA.
[Docket No. FAA–2006–25877, Amdt. 21–92, 74
FR 53392, Oct. 16, 2009, as amended by Doc.
No. FAA–2018–0119, Amdt. 21–101, 83 FR 9169,
Mar. 5, 2018]
§ 21.619
Design changes.
(a)
Minor changes by the manufacturer
holding a TSO authorization. The manu-
facturer of an article under an author-
ization issued under this part may
make minor design changes (any
change other than a major change)
without further approval by the FAA.
In this case, the changed article keeps
the original model number (part num-
bers may be used to identify minor
changes) and the manufacturer must
forward to the FAA, any revised data
that are necessary for compliance with
§ 21.603(a).
(b)
Major changes by the manufacturer
holding a TSO authorization. Any design
change by the manufacturer extensive
enough to require a substantially com-
plete investigation to determine com-
pliance with a TSO is a major change.
Before making a major change, the
manufacturer must assign a new type
or model designation to the article and
apply for an authorization under
§ 21.603.
(c)
Changes by persons other than the
manufacturer. No design change by any
person (other than the manufacturer
who provided the statement of con-
formance for the article) is eligible for
approval under this part unless the per-
son seeking the approval is a manufac-
turer and applies under § 21.603(a) for a
separate TSO authorization. Persons
other than a manufacturer may obtain
approval for design changes under part
43 or under the applicable airworthi-
ness regulations of this chapter.
[Docket No. FAA–2006–25877, Amdt. 21–92, 74
FR 53392, Oct. 16, 2009, as amended by Doc.
No. FAA–2018–0119, Amdt. 21–101, 83 FR 9169,
Mar. 5, 2018; Doc. No. FAA–2022–1355, Amdt.
21–106, 87 FR 75710, Dec. 9, 2022]
§ 21.620
Changes in quality system.
After the issuance of a TSO author-
ization—
(a) Each change to the quality sys-
tem is subject to review by the FAA;
and
(b) The holder of the TSO authoriza-
tion must immediately notify the FAA,
in writing, of any change that may af-
fect the inspection, conformity, or air-
worthiness of its article.
§ 21.621
Issue of letters of TSO design
approval: Import articles.
(a) The FAA may issue a letter of
TSO design approval for an article—
(1) Designed and manufactured in a
foreign country or jurisdiction subject
to the export provisions of an agree-
ment with the United States for the ac-
ceptance of these articles for import;
and
(2) For import into the United States
if—
(i) The State of Design certifies that
the article has been examined, tested,
and found to meet the applicable TSO
or the applicable performance stand-
ards of the State of Design and any
other performance standards the FAA
may prescribe to provide a level of
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