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152 

14 CFR Ch. I (1–1–24 Edition) 

§ 21.111 

regulations in effect on the date of the 
application for the change. 

(e) An application for a change to a 

type certificate for a transport cat-
egory aircraft is effective for 5 years, 
and an application for a change to any 
other type certificate is effective for 3 
years. If the change has not been ap-
proved, or if it is clear that it will not 
be approved under the time limit es-
tablished under this paragraph, the ap-
plicant may do either of the following: 

(1) File a new application for a 

change to the type certificate and com-
ply with all the provisions of paragraph 
(a) of this section applicable to an 
original application for a change. 

(2) File for an extension of the origi-

nal application and comply with the 
provisions of paragraph (a) of this sec-
tion. The applicant must then select a 
new application date. The new applica-
tion date may not precede the date the 
change is approved by more than the 
time period established under this 
paragraph (e). 

(f) For aircraft certificated under 

§§ 21.17(b), 21.24, 21.25, and 21.27 the air-
worthiness requirements applicable to 
the category of the product in effect on 
the date of the application for the 
change include each airworthiness re-
quirement that the FAA finds to be ap-
propriate for the type certification of 
the aircraft in accordance with those 
sections. 

(g) Notwithstanding paragraph (b) of 

this section, for transport category air-
planes, the applicant must show com-
pliance with each applicable provision 
of part 26 of this chapter, unless the ap-
plicant has elected or was required to 
comply with a corresponding amend-
ment to part 25 of this chapter that 
was issued on or after the date of the 
applicable part 26 provision. 

[Doc. No. 28903, 65 FR 36266, June 7, 2000, as 
amended by Amdt. 21–90, 72 FR 63404, Nov. 8, 
2007; Amdt. 21–96, 77 FR 71695, Dec. 4, 2012; 
Doc. No. FAA–2015–1621, Amdt. 21–100, 81 FR 
96689, Dec. 30, 2016] 

Subpart E—Supplemental Type 

Certificates 

S

OURCE

: Docket No. 5085, 29 FR 14568, Oct. 

24, 1964, unless otherwise noted. 

§ 21.111

Applicability. 

This subpart prescribes procedural 

requirements for the issue of supple-
mental type certificates. 

§ 21.113

Requirement for supplemental 

type certificate. 

(a) If a person holds the TC for a 

product and alters that product by in-
troducing a major change in type de-
sign that does not require an applica-
tion for a new TC under § 21.19, that 
person must apply to the FAA either 
for an STC, or to amend the original 
type certificate under subpart D of this 
part. 

(b) If a person does not hold the TC 

for a product and alters that product 
by introducing a major change in type 
design that does not require an applica-
tion for a new TC under § 21.19, that 
person must apply to the FAA for an 
STC. 

(c) The application for an STC must 

be made in the form and manner pre-
scribed by the FAA. 

[Doc. No. FAA–2006–25877, Amdt. 21–92, 74 FR 
53387, Oct. 16, 2009; Doc. No. FAA–2018–0119, 
Amdt. 21–101, 83 FR 9169, Mar. 5, 2018] 

§ 21.115

Applicable requirements. 

(a) Each applicant for a supplemental 

type certificate must show that the al-
tered product meets applicable require-
ments specified in § 21.101 and, in the 
case of an acoustical change described 
in § 21.93(b), show compliance with the 
applicable noise requirements of part 
36 of this chapter and, in the case of an 
emissions change described in § 21.93(c), 
show compliance with the applicable 
fuel venting and exhaust emissions re-
quirements of part 34 of this chapter. 

(b) Each applicant for a supplemental 

type certificate must meet §§ 21.33 and 
21.53 with respect to each change in the 
type design. 

[Amdt. 21–17, 32 FR 14927, Oct. 28, 1967, as 
amended by Amdt. 21–42, 40 FR 1033, Jan. 6, 
1975; Amdt. 21–52A, 45 FR 79009, Nov. 28, 1980; 
Amdt. 21–61, 53 FR 3540, Feb. 5, 1988; Amdt. 
21–68, 55 FR 32860, Aug. 10, 1990; Amdt. 21–71, 
57 FR 42854, Sept. 16, 1992; Amdt. 21–77, 65 FR 
36266, June 7, 2000] 

§ 21.117

Issue of supplemental type 

certificates. 

(a) An applicant is entitled to a sup-

plemental type certificate if the FAA 

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153 

Federal Aviation Administration, DOT 

§ 21.123 

finds that the applicant meets the re-
quirements of §§ 21.113 and 21.115. 

(b) A supplemental type certificate 

consists of— 

(1) The approval by the FAA of a 

change in the type design of the prod-
uct; and 

(2) The type certificate previously 

issued for the product. 

[Doc. No. 5085, 29 FR 14568, Oct. 24, 1964, as 
amended by Amdt. 21–92, 74 FR 53387, Oct. 16, 
2009] 

§ 21.119

Privileges. 

The holder of a supplemental type 

certificate may— 

(a) In the case of aircraft, obtain air-

worthiness certificates; 

(b) In the case of other products, ob-

tain approval for installation on cer-
tificated aircraft; and 

(c) Obtain a production certificate in 

accordance with the requirements of 
subpart G of this part for the change in 
the type design approved by the supple-
mental type certificate. 

[Doc. No. 5085, 29 FR 14568, Oct. 24, 1964, as 
amended by Amdt. 21–92, 74 FR 53387, Oct. 16, 
2009] 

§ 21.120

Responsibility of supple-

mental type certificate holders to 
provide written permission for al-
terations. 

A supplemental type certificate hold-

er who allows a person to use the sup-
plemental type certificate to alter an 
aircraft, aircraft engine, or propeller 
must provide that person with written 
permission acceptable to the FAA. 

[Doc. No. FAA–2003–14825, 71 FR 52258, Sept. 
1, 2006] 

Subpart F—Production Under Type 

Certificate 

S

OURCE

: Docket No. 5085, 29 FR 14568, Oct. 

24, 1964, unless otherwise noted. 

§ 21.121

Applicability. 

This subpart prescribes rules for pro-

duction under a type certificate. 

§ 21.122

Location of or change to man-

ufacturing facilities. 

(a) A type certificate holder may uti-

lize manufacturing facilities located 
outside of the United States if the FAA 

finds no undue burden in administering 
the applicable requirements of Title 49 
U.S.C. and this subchapter. 

(b) The type certificate holder must 

obtain FAA approval before making 
any changes to the location of any of 
its manufacturing facilities. 

(c) The type certificate holder must 

immediately notify the FAA, in writ-
ing, of any change to the manufac-
turing facilities that may affect the in-
spection, conformity, or airworthiness 
of its product or article. 

[Doc. No. FAA–2006–25877, Amdt. 21–92, 74 FR 
53387, Oct. 16, 2009; Amdt. 21–92A, 75 FR 9095, 
Mar. 1, 2010] 

§ 21.123

Production under type certifi-

cate. 

Each manufacturer of a product 

being manufactured under a type cer-
tificate must— 

(a) Maintain at the place of manufac-

ture all information and data specified 
in §§ 21.31 and 21.41; 

(b) Make each product and article 

thereof available for inspection by the 
FAA; 

(c) Maintain records of the comple-

tion of all inspections and tests re-
quired by §§ 21.127, 21.128, and 21.129 for 
at least 5 years for the products and ar-
ticles thereof manufactured under the 
approval and at least 10 years for crit-
ical components identified under 
§ 45.15(c) of this chapter; 

(d) Allow the FAA to make any in-

spection or test, including any inspec-
tion or test at a supplier facility, nec-
essary to determine compliance with 
this subchapter; 

(e) Mark the product in accordance 

with part 45 of this chapter, including 
any critical parts; 

(f) Identify any portion of that prod-

uct (

e.g.,  sub-assemblies, component 

parts, or replacement articles) that 
leave the manufacturer’s facility as 
FAA approved with the manufacturer’s 
part number and name, trademark, 
symbol, or other FAA-approved manu-
facturer’s identification; and 

(g) Except as otherwise authorized by 

the FAA, obtain a production certifi-
cate for that product in accordance 
with subpart G of this part within 6 

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