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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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