Federal Aviation Administration, DOT

Section 21.621

symbol, or other FAA approved manufacturer-s identification;
(f) Have access to design data necessary to determine conformity and
airworthiness for each article produced
under the TSO authorization. The manufacturer 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 request; and
(h) Make available to the FAA information regarding all delegation of authority to suppliers.
Section 21.618 Approval for deviation.
(a) Each manufacturer who requests
approval to deviate from any performance standard of a TSO must show that
factors or design features providing an
equivalent level of safety compensate
for the standards from which a deviation is requested.
(b) The manufacturer must send requests 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 jurisdiction, the manufacturer must send
requests for approval to deviate, together with all pertinent data, through
the civil aviation authority of that
country or jurisdiction to the FAA.

spaschal on DSK3GDR082PROD with CFR

[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]

Section 21.619 Design changes.
(a) Minor changes by the manufacturer
holding a TSO authorization. The manufacturer of an article under an authorization 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 numbers may be used to identify minor
changes) and the manufacturer must
forward to the FAA, any revised data
that are necessary for compliance with
Section 21.603(b).
(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 compliance 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
Section 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 conformance for the article) is eligible for
approval under this part unless the person seeking the approval is a manufacturer and applies under Section 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 airworthiness 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]

Section 21.620

Changes in quality system.

After the issuance of a TSO authorization - 
(a) Each change to the quality system is subject to review by the FAA;
and
(b) The holder of the TSO authorization must immediately notify the FAA,
in writing, of any change that may affect the inspection, conformity, or airworthiness of its article.
Section 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 agreement with the United States for the acceptance 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 standards of the State of Design and any
other performance standards the FAA
may prescribe to provide a level of
safety equivalent to that provided by
the TSO; and

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