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14 CFR Ch. I (1–1–18 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 

(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 




: Docket No. 5085, 29 FR 14568, Oct. 

24, 1964, unless otherwise noted. 

§ 21.111


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 either apply to the appro-
priate aircraft certification office for 
an STC or apply to amend the original 
type certificate under subpart D of this 

(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 appropriate 
aircraft certification office 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] 

§ 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 


(a) An applicant is entitled to a sup-

plemental type certificate if the FAA 

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