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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, 

§ 21.119


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, 

§ 21.120

Responsibility of supple-

mental type certificate holders to 
provide written permission for al-

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 




: Docket No. 5085, 29 FR 14568, Oct. 

24, 1964, unless otherwise noted. 

§ 21.121


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-


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 

(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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