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14 CFR Ch. I (1–1–18 Edition) 

§ 36.1 

flight time before January 1, 1980, must 
show compliance with the applicable 
provisions of this part. 

(f) For the purpose of showing com-

pliance with this part for transport 
category large airplanes and jet air-
planes regardless of category, the fol-
lowing terms have the following mean-
ings: 

(1) A ‘‘Stage 1 noise level’’ means a 

flyover, lateral or approach noise level 
greater than the Stage 2 noise limits 
prescribed in section B36.5(b) of appen-
dix B of this part. 

(2) A ‘‘Stage 1 airplane’’ means an 

airplane that has not been shown under 
this part to comply with the flyover, 
lateral, and approach noise levels re-
quired for Stage 2 or Stage 3 airplanes. 

(3) A ‘‘Stage 2 noise level’’ means a 

noise level at or below the Stage 2 
noise limits prescribed in section 
B36.5(b) of appendix B of this part but 
higher than the Stage 3 noise limits 
prescribed in section B36.5(c) of appen-
dix B of this part. 

(4) A ‘‘Stage 2 airplane’’ means an 

airplane that has been shown under 
this part to comply with Stage 2 noise 
levels prescribed in section B36.5(b) of 
appendix B of this part (including use 
of the applicable tradeoff provisions 
specified in section B36.6) and that does 
not comply with the requirements for a 
Stage 3 airplane. 

(5) A ‘‘Stage 3 noise level’’ means a 

noise level at or below the Stage 3 
noise limits prescribed in section 
B36.5(c) of appendix B of this part. 

(6) A ‘‘Stage 3 airplane’’ means an 

airplane that has been shown under 
this part to comply with Stage 3 noise 
levels prescribed in section B36.5(c) of 
appendix B of this part (including use 
of the applicable tradeoff provisions 
specified in section B36.6). 

(7) A ‘‘subsonic airplane’’ means an 

airplane for which the maximum oper-
ating limit speed, M

mo

, does not exceed 

a Mach number of 1. 

(8) A ‘‘supersonic airplane’’ means an 

airplane for which the maximum oper-
ating limit speed, M

mo

, exceeds a Mach 

number of 1. 

(9) A ‘‘Stage 4 noise level’’ means a 

noise level at or below the Stage 4 
noise limit prescribed in section 
B36.5(d) of appendix B of this part. 

(10) A ‘‘Stage 4 airplane’’ means an 

airplane that has been shown under 
this part not to exceed the Stage 4 
noise limit prescribed in section 
B36.5(d) of appendix B of this part. 

(11) A ‘‘Chapter 4 noise level’’ means 

a noise level at or below the maximum 
noise level prescribed in Chapter 4, 
Paragraph 4.4, Maximum Noise Levels, 
of the International Civil Aviation Or-
ganization (ICAO) Annex 16, Volume I, 
Amendment 7, effective March 21, 2002. 
[Incorporated by reference, see § 36.6]. 

(12) A ‘‘Stage 5 noise level’’ means a 

noise level at or below the Stage 5 
noise limit prescribed in section 
B36.5(e) of appendix B to this part. 

(13) A ‘‘Stage 5 airplane’’ means an 

airplane that has been shown under 
this part not to exceed the Stage 5 
noise limit prescribed in section 
B36.5(e) of appendix B to this part. 

(14) A ‘‘Chapter 14 noise level’’ means 

a noise level at or below the Chapter 14 
maximum noise level prescribed in 
Chapter 14 of the ICAO Annex 16, Vol-
ume 1, Seventh Edition, Amendment 
11–B (Incorporated by reference, see 
§ 36.6). 

(g) For the purpose of showing com-

pliance with this part for transport 
category large airplanes and jet air-
planes regardless of category, each air-
plane may not be identified as com-
plying with more than one stage or 
configuration simultaneously. 

(h) For the purpose of showing com-

pliance with this part, for helicopters 
in the primary, normal, transport, and 
restricted categories, the following 
terms have the specified meanings: 

(1) Stage 1 noise level means a takeoff, 

flyover, or approach noise level greater 
than the Stage 2 noise limits pre-
scribed in section H36.305 of appendix H 
of this part, or a flyover noise level 
greater than the Stage 2 noise limits 
prescribed in section J36.305 of appen-
dix J of this part. 

(2)  Stage 1 helicopter means a heli-

copter that has not been shown under 
this part to comply with the takeoff, 
flyover, and approach noise levels re-
quired for Stage 2 helicopters as pre-
scribed in section H36.305 of appendix H 
of this part, or a helicopter that has 

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