[Code of Federal Regulations]

[Title 14, Volume 1]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR36.11]



[Page 818-819]

 

                     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 7,000 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 7,000 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.



[[Page 819]]



    (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, as amended by Amdt. 36-25, 

69 FR 31234, June 2, 2004]