170
14 CFR Ch. I (1–1–14 Edition)
§ 21.619
§ 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 appropriate aircraft cer-
tification office, any revised data that
are necessary for compliance with
§ 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 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.
§ 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
safety equivalent to that provided by
the TSO; and
(ii) The manufacturer has provided to
the FAA one copy of the technical data
required in the applicable performance
standard through its State of Design.
(b) The FAA issues the letter of TSO
design approval that lists any devi-
ation granted under § 21.618.
[Doc. No. FAA–2006–25877, Amdt. 21–92, 74 FR
53392, Oct. 16, 2009, as amended by Amdt. 21–
92A, 75 FR 9095, Mar. 1, 2010]
Subpart P—Special Federal
Aviation Regulations
S
OURCE
: Docket No. FAA–2011–0186, Amdt.
21–92, 76 FR 12555, Mar. 8, 2011, unless other-
wise noted.
§ 21.700
SFAR No. 111—Lavatory Oxy-
gen Systems.
The requirements of § 121.1500 of this
chapter also apply to this part.
PART 23—AIRWORTHINESS STAND-
ARDS: NORMAL, UTILITY, ACRO-
BATIC, AND COMMUTER CAT-
EGORY AIRPLANES
S
PECIAL
F
EDERAL
A
VIATION
R
EGULATION
N
O
.
23
Subpart A—General
Sec.
23.1
Applicability.
23.2
Special retroactive requirements.
23.3
Airplane categories.
Subpart B—Flight
G
ENERAL
23.21
Proof of compliance.
23.23
Load distribution limits.
23.25
Weight limits.
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