776 

14 CFR Ch. I (1–1–24 Edition) 

§ 36.801 

Subpart G 

[

Reserved

] 

Subpart H—Helicopters 

S

OURCE

: Amdt. 36–14, 53 FR 3540, Feb. 5, 

1988; 53 FR 7728, Mar. 10, 1988, unless other-
wise noted. 

§ 36.801

Noise measurement. 

For primary, normal, transport, or 

restricted category helicopters for 
which certification is sought under ap-
pendix H of this part, the noise gen-
erated by the helicopter must be meas-
ured at the noise measuring points and 
under the test conditions prescribed in 
part B of appendix H of this part, or 
under an FAA-approved equivalent pro-
cedure. For those primary, normal, 
transport, and restricted category heli-
copters having a maximum certificated 
takeoff weight of not more than 7,000 
pounds for which compliance with ap-
pendix J of this part is demonstrated, 
the noise generated by the helicopter 
must be measured at the noise meas-
uring point and under the test condi-
tions prescribed in part B of appendix J 
of this part, or an FAA-approved equiv-
alent procedure. 

[Doc. No. 26910, 57 FR 42854, Sept. 16, 1992, as 
amended by Amdt. 36–25, 69 FR 31234, June 2, 
2004] 

§ 36.803

Noise evaluation and calcula-

tion. 

The noise measurement data required 

under § 36.801 and obtained under ap-
pendix H of this part must be corrected 
to the reference conditions contained 
in part A of appendix H of this part, 
and evaluated under the procedures of 
part C of appendix H of this part, or an 
FAA-approved equivalent procedure. 
The noise measurement data required 
under § 36.801 and obtained under ap-
pendix J of this part must be corrected 
to the reference conditions contained 
in part A of appendix J of this part, and 
evaluated under the procedures of part 
C of appendix J of this part, or an FAA- 
approved equivalent procedure. 

[Doc. No. 26910, 57 FR 42854, Sept. 16, 1992] 

§ 36.805

Noise limits. 

(a) Compliance with the noise levels 

prescribed under part D of appendix H 
of this part, or under part D of appen-

dix J of this part, must be shown for 
helicopters for which application for 
issuance of a type certificate in the 
primary, normal, transport, or re-
stricted category is made on or after 
March 6, 1986. 

(b) For helicopters covered by this 

section, except as provided in para-
graph (c) or (d)(2) of this section, it 
must be shown either: 

(1) When an application for issuance 

of a type certificate in the primary, 
normal, transport, or restricted cat-
egory is made on and after March 6, 
1986 and before May 5, 2014, that the 
noise levels of the helicopter are no 
greater than the Stage 2 noise limits 
prescribed in either section H36.305 of 
appendix H of this part or section 
J36.305 of appendix J of this part, as ap-
plicable; or 

(2) When an application for issuance 

of a type certificate in the primary, 
normal, transport, or restricted cat-
egory is made on or after May 5, 2014, 
that the noise levels of the helicopter 
are no greater than the Stage 3 noise 
limits prescribed in either section 
H36.305 of appendix H of this part, or 
section J36.305 of appendix J of this 
part, as applicable. 

(c) For helicopters for which applica-

tion for issuance of an original type 
certificate in the primary, normal, 
transport, or restricted category is 
made on or after March 6, 1986, and 
which the FAA finds to be the first 
civil version of a helicopter that was 
designed and constructed for, and ac-
cepted for operational use by, an 
Armed Force of the United States or 
the U.S. Coast Guard on or before 
March 6, 1986, it must be shown that 
the noise levels of the helicopter are no 
greater than the noise limits for a 
change in type design as specified in 
section H36.305(a)(1)(ii) of appendix H of 
this part for compliance demonstrated 
under appendix H of this part, or as 
specified in section J36.305 of appendix 
J of this part for compliance dem-
onstrated under appendix J of this 
part. Subsequent civil versions of any 
such helicopter must meet the Stage 2 
requirements. 

(d) Helicopters in the primary cat-

egory: 

(1) Except as provided in paragraph 

(d)(2) of this section, for a helicopter 

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Federal Aviation Administration, DOT 

§ 36.1581 

for which application for a type certifi-
cate in the primary category is made, 
and that was not previously certifi-
cated under appendix H of this part, 
compliance with appendix H of this 
part must be shown. 

(2) For a helicopter that: 
(i) Has a normal or transport type 

certificate issued under this chapter, 

(ii) Has a standard airworthiness cer-

tificate issued under this chapter, 

(iii) Has not undergone an acoustical 

change from its type design, 

(iv) Has not previously been certifi-

cated under appendix H of this part, 
and 

(v) For which application for conver-

sion to the primary category is made, 
no further showing of compliance with 
this part is required. 

[Doc. No. 26910, 57 FR 42855, Sept. 16, 1992, as 
amended by Amdt. 36–30, 79 FR 12045, Mar. 4, 
2014] 

Subparts I–J 

[

Reserved

] 

Subpart K—Tiltrotors 

S

OURCE

: 78 FR 1139, Jan. 8, 2013, unless oth-

erwise noted. 

§ 36.1101

Noise measurement and eval-

uation. 

For tiltrotors, the noise generated 

must be measured and evaluated under 
Appendix K of this part, or under an 
approved equivalent procedure. 

§ 36.1103

Noise limits. 

(a) Compliance with the maximum 

noise levels prescribed in Appendix K 
of this part must be shown for a 
tiltrotor for which the application for 
the issuance of a type certificate is 
made on or after March 11, 2013. 

(b) To demonstrate compliance with 

this part, noise levels may not exceed 
the noise limits listed in Appendix K, 
Section K4, Noise Limits of this part. 
Appendix K of this part (or an approved 
equivalent procedure) must also be 
used to evaluate and demonstrate com-
pliance with the approved test proce-
dures, and at the applicable noise 
measurement points. 

Subparts L–N 

[

Reserved

] 

Subpart O—Documentation, Op-

erating Limitations and Infor-
mation 

§ 36.1501

Procedures, noise levels and 

other information. 

(a) All procedures, weights, configu-

rations, and other information or data 
employed for obtaining the certified 
noise levels prescribed by this part, in-
cluding equivalent procedures used for 
flight, testing, and analysis, must be 
developed and approved. Noise levels 
achieved during type certification 
must be included in the approved air-
plane (rotorcraft) flight manual. 

(b) Where supplemental test data are 

approved for modification or extension 
of an existing flight data base, such as 
acoustic data from engine static tests 
used in the certification of acoustical 
changes, the test procedures, physical 
configuration, and other information 
and procedures that are employed for 
obtaining the supplemental data must 
be developed and approved. 

[Amdt. 36–15, 53 FR 16366, May 6, 1988] 

§ 36.1581

Manuals, markings, and plac-

ards. 

(a) If an Airplane Flight Manual or 

Rotorcraft Flight Manual is approved, 
the approved portion of the Airplane 
Flight Manual or Rotorcraft Flight 
Manual must contain the following in-
formation, in addition to that specified 
under § 36.1583 of this part. If an Air-
plane Flight Manual or Rotorcraft 
Flight Manual is not approved, the pro-
cedures and information must be fur-
nished in any combination of approved 
manual material, markings, and plac-
ards. 

(1) For transport category large air-

planes and jet airplanes, the noise level 
information must be one value for each 
flyover, lateral, and approach as de-
fined and required by appendix B of 
this part, along with the maximum 
takeoff weight, maximum landing 
weight, and configuration. 

(2) For propeller driven small air-

planes, the noise level information 
must be one value for takeoff as de-
fined and required by appendix G of 
this part, along with the maximum 
takeoff weight and configuration. 

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