[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR36.11]

[Page 785]
 
                     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. 36.11  Acoustical change: Helicopters.

    This section applies to all helicopters in the primary, normal, 
transport, and restricted categories for which an acoustical change 
approval is applied for under Sec. 21.93(b) of this chapter on or after 
March 6, 1986. Compliance with the requirements of this section must be 
demonstrated under appendix H of this part, or, for helicopters having a 
maximum certificated takeoff weight of not more than 6,000 pounds, 
compliance with this section may be demonstrated under appendix J of 
this part.
    (a) General requirements. Except as otherwise provided, for 
helicopters covered by this section, the acoustical change approval 
requirements are as follows:
    (1) In showing compliance with the requirements of appendix H of 
this part, noise levels must be measured, evaluated, and calculated in 
accordance with the applicable procedures and conditions prescribed in 
parts B and C of appendix H of this part. For helicopters having a 
maximum certificated takeoff weight of not more than 6,000 pounds that 
alternatively demonstrate compliance under appendix J of this part, the 
flyover noise level prescribed in appendix J of this part must be 
measured, evaluated, and calculated in accordance with the applicable 
procedures and conditions prescribed in parts B and C of appendix J of 
this part.
    (2) Compliance with the noise limits prescribed in section H36.305 
of appendix H of this part must be shown in accordance with the 
applicable provisions of part D of appendix H of this part. For those 
helicopters that demonstrate compliance with the requirements of 
appendix J of this part, compliance with the noise levels prescribed in 
section J36.305 of appendix J of this part must be shown in accordance 
with the applicable provisions of part D of appendix J of this part.
    (b) Stage 1 helicopters. Except as provided in Sec. 36.805(c), for 
each Stage 1 helicopter prior to a change in type design, the helicopter 
noise levels may not, after a change in type design, exceed the noise 
levels specified in section H36.305(a)(1) of appendix H of this part 
where the demonstration of compliance is under appendix H of this part. 
The tradeoff provisions under section H36.305(b) of appendix H of this 
part may not be used to increase any Stage 1 noise level beyond these 
limits. If an applicant chooses to demonstrate compliance under appendix 
J of this part, for each Stage 1 helicopter prior to a change in type 
design, the helicopter noise levels may not, after a change in type 
design, exceed the Stage 2 noise levels specified in section J36.305(a) 
of appendix J of this part.
    (c) Stage 2 helicopters. For each helicopter that is Stage 2 prior 
to a change in type design, the helicopter must be a Stage 2 helicopter 
after a change in type design.

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