1 HISTORY
2 INTRODUCTION
   2.1 PURPOSE AND SCOPE
   2.2 SOUND PRESSURE AND SOUND POWER
   2.3 TEST METHOD
   2.4 ACCURACY OF TEST RESULTS
   2.5 PRESENTATION OF RESULTS
   2.6 APPLICATION OF SOUND POWER LEVELS
3 SYMBOLS AND DEFINITIONS
   3.1 SYMBOLS
   3.2 DEFINITIONS
        3.2.1 Blade Passage Frequency
        3.2.2. Chamber
        3.2.3 Decibel
        3.2.4 Ducted Fan
        3.2.5 End Reflection
        3.2.6 Frequency
        3.2.7 Nonducted Fan
        3.2.8 Octave Band
        3.2.9 Reverberant Room
        3.2.10 Shall and Should
        3.2.11 Sound Power Level (Lw
        3.2.12 Sound Pressure Level (Lp)
        3.2.13 Wavelength
4 INSTRUMENTS AND EQUIPMENT
   4.1 SOUND LEVEL METER
   4.2 MICROPHONE AND ASSOCIATED CABLE
   4.3 FREQUENCY ANALYZER AND WEIGHTING SYSTEM
   4.4 DATA RECORDING EQUIPMENT
   4.5 REFERENCE SOUND SOURCE (RSS)
5 TEST SETUPS
   5.1 SETUP CATEGORIES
   5.2 AERODYNAMIC PERFORMANCE
   5.3 MOUNTING METHODS
   5.4 DUCT LENGTH
   5.5 MICROPHONE TRAVEL
   5.6 CALIBRATION OF SYSTEM
   5.7 EQUATIONS
6 OBSERVATIONS AND CALCULATIONS
   6.1 OBSERVATIONS
        6.1.1 Point of Operation
        6.1.2 Sound Pressure Levels
        6.1.2.1 Sound Pressure Levels, Background (Lpb)
        6.1.2.2 Sound Pressure Levels, RSS (Lpqm)
        6.1.2.3 Sound Pressure Levels, Fan (Lp)
        6.1.3 Test Conditions
   6.2 CALCULATIONS
        6.2.1 Background Corrections
        6.2.2 Sound Power LEVEL
7 INFORMATION TO BE RECORDED
   7.1 FAN UNDER TEST
   7.2 TEST ENVIRONMENT
   7.3 LABORATORY AND INSTRUMENTATION
   7.4 ACOUSTIC DATA
8 MINIMUM INFORMATION TO BE REPORTED
   8.1 FAN UNDER TEST
   8.2 LABORATORY AND INSTRUMENTATION
   8.3 ACOUSTIC DATA
APPENDIX A. ROOM QUALIFICATION: FULL OCTAVE/ONE-THIRD
            OCTAVE
APPENDIX B. ROOM QUALIFICATION: PURE TONES/NARROW BAND
APPENDIX C. UNCERTAINTIES ANALYSIS
APPENDIX D. ALTERNATIVE PROCEDURE FOR RSS CALIBRATION
APPENDIX E. DUCT END CORRECTION
APPENDIX F. FILTER WEIGHTED MEASUREMENTS
APPENDIX G. RADIATION OF SOUND BY FAN CASING
APPENDIX H. TOTAL FAN SOUND TESTING WITH ATTACHED DUCTS
APPENDIX J. REFERENCES