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Circular 365. Edition 1
Last modified:1/1/2026
Interim Noise Measurement Guidelines for Smaller Emerging Technology Aircraft
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Circular 365Interim Noise Measurement Guidelines for Smaller Emerging Technology AircraftApproved by and published under the authority of the Secretary GeneralINTERNATIONAL CIVIL AVIATION ORGANIZATION
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Annex 16. Vol 1. Edition 8. Environmental Protection. Volume I. Aircraft NoiseDoc 9501. Vol 2. Edition 4. Environmental Technical Manual. Volume II. Procedures for the Emissions Certification of Aircraft EnginesВСЕ ДОКУМЕНТЫ
Table Of Contents
Cover Page
FOREWORD
CONTENTS
1.2 NOISE EVALUATION METRIC
1.4 MAXIMUM NOISE LEVELS
1.3 NOISE MEASUREMENT REFERENCE POINTS
Chapter 1
1.1 APPLICABILITY
1.5.1 General conditions
1.5 REFERENCE PROCEDURES
1.5.2 Level-flight reference procedure
1.6 TEST PROCEDURES
1.5.3 Hover reference procedure
1.6.8 For the hover procedure:
2.2.1 General test conditions
Appendix A
2.1 General
2.2 Test environment
2.2.2 Atmospheric conditions
2.2.4 Instrumentation accuracy
2.2.3 Location of atmospheric measurements
2.3 Flight path measurement
3.3 A-frequency weighting
3.1 A-weighted sound exposure level
3.2 A-weighted equivalent continuous sound pressure level
4.2 Sensing, recording and reproducing equipment
4.1 Measurement system
4.3 Noise measurement procedures
5.1 General
5.3 Adjustments for duration correction
5.2 Adjustments for distance
5.4 Adjustments for airspeed
5.5 Adjustments for atmospheric absorption
6.1 Data reporting
6.2 Reporting of reference conditions
6.3 Validity of results
Appendix B
3.1 Test height and speed
3.2 Allowable height and lateral/vertical deviations
3.3 Number of test runs
4.2 Digital photographic scaling
3.4 Noisiest configuration
4.1 DGNSS-based time-space-position information tracking system
4.2.1 General
4.2.2 Digital camera
4.2.3 Height determination
4.2.4 Lateral distance determination
4.2.5 Ground speed determination for the level-flight procedure
4.2.6 Calibration
4.2.7 Camera shutter sound
4.2.8 Video camera