[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR36.7]

[Page 807-808]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 36--NOISE STANDARDS: AIRCRAFT TYPE AND AIRWORTHINESS CERTIFICATION--Table 
of Contents
 
                           Subpart A--General
 
Sec. 36.7  Acoustical change: Transport category large airplanes and jet airplanes.

    (a) Applicability. This section applies to all transport category 
large airplanes and jet airplanes for which an acoustical change 
approval is applied for under Sec. 21.93(b) of this chapter.
    (b) General requirements. Except as otherwise specifically provided, 
for each airplane covered by this section, the acoustical change 
approval requirements are as follows:
    (1) In showing compliance, noise levels must be measured and 
evaluated in accordance with the applicable procedures and conditions 
prescribed in Appendix A of this part.
    (2) Compliance with the noise limits prescribed in section B36.5 of 
appendix B must be shown in accordance with the applicable provisions of 
sections B36.7 and B36.8 of appendix B of this part.
    (c) Stage 1 airplanes. For each Stage 1 airplane prior to the change 
in type design, in addition to the provisions of paragraph (b) of this 
section, the following apply:
    (1) If an airplane is a Stage 1 airplane prior to the change in type 
design, it may not, after the change in type design, exceed the noise 
levels created prior to the change in type design. The tradeoff 
provisions of section B36.6 of

[[Page 808]]

appendix B of this part may not be used to increase the Stage 1 noise 
levels, unless the aircraft qualifies as a Stage 2 airplane.
    (2) In addition, for an airplane for which application is made after 
September 17, 1971--
    (i) There may be no reduction in power or thrust below the highest 
airworthiness approved power or thrust, during the tests conducted 
before and after the change in type design; and
    (ii) During the flyover and lateral noise tests conducted before the 
change in type design, the quietest airworthiness approved configuration 
available for the highest approved takeoff weight must be used.
    (d) Stage 2 airplanes. If an airplane is a Stage 2 airplane prior to 
the change in type design, the following apply, in addition to the 
provisions of paragraph (b) of this section:
    (1) Airplanes with high bypass ratio jet engines. For an airplane 
that has jet engines with a bypass ratio of 2 or more before a change in 
type design--
    (i) The airplane, after the change in type design, may not exceed 
either (A) each Stage 3 noise limit by more than 3 EPNdB, or (B) each 
Stage 2 noise limit, whichever is lower:
    (ii) The tradeoff provisions of section B36.6 of appendix B of this 
part may be used in determining compliance under this paragraph with 
respect to the Stage 2 noise limit or to the Stage 3 plus 3 EPNdB noise 
limits, as applicable; and
    (iii) During the flyover and lateral noise test conducted before the 
change in type design, the quietest airworthiness approved configuration 
available for the highest approved takeoff weight must be used.
    (2) Airplanes that do not have high bypass ratio jet engines. For an 
airplane that does not have jet engines with a bypass ratio of 2 or more 
before a change in type design--
    (i) The airplane may not be a Stage 1 airplane after the change in 
type design; and
    (ii) During the flyover and lateral noise tests conducted before the 
change in type design, the quietest airworthiness approved configuration 
available for the highest approved takeoff weight must be used.
    (e) Stage 3 airplanes. If an airplane is a Stage 3 airplane prior to 
the change in type design, the following apply, in addition to the 
provisions of paragraph (b) of this section:
    (1) If compliance with Stage 3 noise levels is not required before 
the change in type design, the airplane must--
    (i) Be a Stage 2 airplane after the change in type design and 
compliance must be shown under the provisions of paragraph (d)(1) or 
(d)(2) of this section, as appropriate; or
    (ii) Remain a Stage 3 airplane after the change in type design. 
Compliance must be shown under the provisions of paragraph (e)(2) of 
this section.
    (2) If compliance with Stage 3 noise levels is required before the 
change in type design, the airplane must be a Stage 3 airplane after the 
change in type design.
    (3) Applications on or after [August 14, 1989.] The airplane must 
remain a Stage 3 airplane after the change in type design.

[Amdt. 36-7, 42 FR 12371, Mar. 3, 1977; Amdt. 36-8, 43 FR 8730, Mar. 2, 
1978; Amdt. 36-10, 43 FR 28420, June 29, 1978; Amdt. 36-12, 46 FR 33464, 
June 29, 1981; Amdt. 36-15, 53 FR 16366, May 6, 1988; 53 FR 18950, May 
25, 1988; Amdt. 36-17, 54 FR 21042, May 15, 1989; Amdt. 36-54, 67 FR 
45212, July 8, 2002]