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844 

14 CFR Ch. I (1–1–24 Edition) 

Pt. 39 

whichever is greater, above the reference 
track and throughout the 10 dB-down time 
interval. 

K7.9  The tiltrotor altitude must not vary 

during each flyover by more than 

±

30 ft (

±

m) from the reference altitude throughout 
the 10 dB-down time interval. 

K7.10  During the approach procedure, the 

tiltrotor must establish a stabilized constant 
speed approach and fly between approach an-
gles of 5.5 degrees and 6.5 degrees throughout 
the 10 dB-down time interval. 

K7.11  During all test procedures, the 

tiltrotor weight (mass) must not be less than 
90 percent and not more than 105 percent of 
the maximum certificated weight (mass). 
For each of the test procedures, complete at 
least one test at or above this maximum cer-
tificated weight (mass). 

K7.12 A tiltrotor capable of carrying exter-

nal loads or external equipment must be 
noise certificated without such loads or 
equipment fitted 

K7.13  The value of V

CON

used for noise cer-

tification must be included in the approved 
Flight Manual. 

[78 FR 1139, Jan. 8, 2013] 

PART 39—AIRWORTHINESS 

DIRECTIVES 

Sec. 
39.1

Purpose of this regulation. 

39.3

Definition of airworthiness directives. 

39.5

When does FAA issue airworthiness di-

rectives? 

39.7

What is the legal effect of failing to 

comply with an airworthiness directive? 

39.9

What if I operate an aircraft or use a 

product that does not meet the require-
ments of an airworthiness directive? 

39.11

What actions do airworthiness direc-

tives require? 

39.13

Are airworthiness directives part of 

the Code of Federal Regulations? 

39.15

Does an airworthiness directive apply 

if the product has been changed? 

39.17

What must I do if a change in a prod-

uct affects my ability to accomplish the 
actions required in an airworthiness di-
rective? 

39.19

May I address the unsafe condition in 

a way other than that set out in the air-
worthiness directive? 

39.21

Where can I get information about 

FAA-approved alternative methods of 
compliance? 

39.23

May I fly my aircraft to a repair facil-

ity to do the work required by an air-
worthiness directive? 

39.25

How do I get a special flight permit? 

39.27

What do I do if the airworthiness di-

rective conflicts with the service docu-
ment on which it is based? 

A

UTHORITY

: 49 U.S.C. 106(g), 40113, 44701. 

S

OURCE

: Docket No. FAA–2000–8460, 67 FR 

48003, July 22, 2002, unless otherwise noted. 

§ 39.1

Purpose of this regulation. 

The regulations in this part provide a 

legal framework for FAA’s system of 
Airworthiness Directives. 

§ 39.3

Definition of airworthiness di-

rectives. 

FAA’s airworthiness directives are 

legally enforceable rules that apply to 
the following products: aircraft, air-
craft engines, propellers, and appli-
ances. 

§ 39.5

When does FAA issue airworthi-

ness directives? 

FAA issues an airworthiness direc-

tive addressing a product when we find 
that: 

(a) An unsafe condition exists in the 

product; and 

(b) The condition is likely to exist or 

develop in other products of the same 
type design. 

§ 39.7

What is the legal effect of failing 

to comply with an airworthiness di-
rective? 

Anyone who operates a product that 

does not meet the requirements of an 
applicable airworthiness directive is in 
violation of this section. 

§ 39.9

What if I operate an aircraft or 

use a product that does not meet 
the requirements of an airworthi-
ness directive? 

If the requirements of an airworthi-

ness directive have not been met, you 
violate § 39.7 each time you operate the 
aircraft or use the product. 

§ 39.11

What actions do airworthiness 

directives require? 

Airworthiness directives specify in-

spections you must carry out, condi-
tions and limitations you must comply 
with, and any actions you must take to 
resolve an unsafe condition. 

§ 39.13

Are airworthiness directives 

part of the Code of Federal Regula-
tions? 

Yes, airworthiness directives are part 

of the Code of Federal Regulations, but 

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845 

Federal Aviation Administration, DOT 

§ 39.25 

they are not codified in the annual edi-
tion. FAA publishes airworthiness di-
rectives in full in the F

EDERAL

R

EG

-

ISTER

as amendments to § 39.13. 

E

DITORIAL

N

OTE

: For a complete list of ci-

tations to airworthiness directives published 
in the F

EDERAL

R

EGISTER

, consult the fol-

lowing publications: For airworthiness direc-
tives published in the F

EDERAL

R

EGISTER

 

since 2001, see the entries for 14 CFR 39.13 in 
the List of CFR Sections Affected, which ap-
pears in the ‘‘Finding Aids’’ section of the 
printed volume and at 

www.govinfo.gov.  For 

citations to prior amendments, see the en-
tries for 14 CFR 39.13 in the separate publica-
tions List of CFR Sections Affected, 1973– 
1985, List of CFR Sections Affected, 1964–1972, 
and List of CFR Sections Affected, 1986–2000, 
and the entries for 14 CFR 507.10 in the List 
of Sections Affected, 1949–1963. See also the 
annual editions of the Federal Register Index 
for subject matter references and citations 
to FAA airworthiness directives. 

§ 39.15

Does an airworthiness directive 

apply if the product has been 
changed? 

Yes, an airworthiness directive ap-

plies to each product identified in the 
airworthiness directive, even if an indi-
vidual product has been changed by 
modifying, altering, or repairing it in 
the area addressed by the airworthi-
ness directive. 

§ 39.17

What must I do if a change in a 

product affects my ability to accom-
plish the actions required in an air-
worthiness directive? 

If a change in a product affects your 

ability to accomplish the actions re-
quired by the airworthiness directive 
in any way, you must request FAA ap-
proval of an alternative method of 
compliance. Unless you can show the 
change eliminated the unsafe condi-
tion, your request should include the 
specific actions that you propose to ad-
dress the unsafe condition. Submit 
your request in the manner described 
in § 39.19. 

§ 39.19

May I address the unsafe condi-

tion in a way other than that set 
out in the airworthiness directive? 

Yes, anyone may propose to FAA an 

alternative method of compliance or a 
change in the compliance time, if the 
proposal provides an acceptable level of 
safety. Unless FAA authorizes other-
wise, send your proposal to your prin-

cipal inspector. Include the specific ac-
tions you are proposing to address the 
unsafe condition. The principal inspec-
tor may add comments and will send 
your request to the manager of the of-
fice identified in the airworthiness di-
rective (manager). You may send a 
copy to the manager at the same time 
you send it to the principal inspector. 
If you do not have a principal inspector 
send your proposal directly to the man-
ager. You may use the alternative you 
propose only if the manager approves 
it. 

§ 39.21

Where can I get information 

about FAA-approved alternative 
methods of compliance? 

Each airworthiness directive identi-

fies the office responsible for approving 
alternative methods of compliance. 
That office can provide information 
about alternatives it has already ap-
proved. 

§ 39.23

May I fly my aircraft to a re-

pair facility to do the work re-
quired by an airworthiness direc-
tive? 

Yes, the operations specifications 

giving some operators authority to op-
erate include a provision that allow 
them to fly their aircraft to a repair fa-
cility to do the work required by an 
airworthiness directive. If you do not 
have this authority, the local Flight 
Standards District Office of FAA may 
issue you a special flight permit unless 
the airworthiness directive states oth-
erwise. To ensure aviation safety, FAA 
may add special requirements for oper-
ating your aircraft to a place where the 
repairs or modifications can be accom-
plished. FAA may also decline to issue 
a special flight permit in particular 
cases if we determine you cannot move 
the aircraft safely. 

§ 39.25

How do I get a special flight 

permit? 

Apply to FAA for a special flight per-

mit following the procedures in 14 CFR 
21.199. 

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