Search Results

Standard

Methods of Controlling Distortion of Inlet Airflow During Static Acoustical Tests of Turbofan Engines and Fan Rigs

2020-12-22

CURRENT

AIR1935A

This Aerospace Information Report provides guidelines for hardware design. Guidelines on such items as engine types, test arrangements, and test purposes that would benefit from the use of an inflow control device during static noise testing are outside the scope of this report.

Standard

Methods of Controlling Distortion of Inlet Airflow During Static Acoustical Tests of Turbofan Engines and Fan Rigs

2007-11-07

HISTORICAL

AIR1935

This Aerospace Information Report provides guidelines for hardware design. Guidelines on such items as engine types, test arrangements, and test purposes that would benefit from the use of an inflow control device during static noise testing are outside the scope of this report.

Standard

ACOUSTIC EFFECTS PRODUCED BY A REFLECTING PLANE

1976-01-01

HISTORICAL

AIR1327

Standard

Acoustic Effects Produced by a Reflecting Plane

2012-08-16

CURRENT

AIR1327A

Standard

MEASUREMENT OF ROTORCRAFT INTERIOR SOUND PRESSURE LEVELS

1993-05-01

HISTORICAL

ARP1964

Satisfactory measurements of noise in personnel-occupied rotorcraft cabins may require test techniques different from those prescribed for other types of aircraft (ARP1323) because rotorcraft operate under significantly different flight conditions. Recommendations of this ARP apply to the recording of acoustical data on magnetic tape and the subsequent processing and analysis of the recorded data.

Standard

Measurement of Rotorcraft Interior Sound Pressure Levels

2012-08-16

CURRENT

ARP1964A

Satisfactory measurements of noise in personnel-occupied rotorcraft cabins may require test techniques different from those prescribed for other types of aircraft (ARP1323) because rotorcraft operate under significantly different flight conditions. Recommendations of this ARP apply to the recording of acoustical data on magnetic tape and the subsequent processing and analysis of the recorded data.

Standard

QUANTITIES FOR DESCRIPTION OF THE ACOUSTICAL ENVIRONMENT OF THE INTERIOR OF AIRCRAFT

1991-03-15

HISTORICAL

ARP4245

This Aerospace Recommended Practice (ARP) defines quantities that may be used to describe various attributes of the sound field in the interior of aircraft. For a particular aircraft, or for a specific situation in a particular aircraft, it may not be necessary to utilize all the quantities included here to provide an adequate description of an aircraft's interior acoustical environment.

Standard

Quantities for Description of the Acoustical Environment of the Interior of Aircraft

2012-08-16

CURRENT

ARP4245A

This Aerospace Recommended Practice (ARP) defines quantities that may be used to describe various attributes of the sound field in the interior of aircraft. For a particular aircraft, or for a specific situation in a particular aircraft, it may not be necessary to utilize all the quantities included here to provide an adequate description of an aircraft's interior acoustical environment.

Standard

AIRCRAFT NOISE RESEARCH NEEDS

2002-12-16

CURRENT

AIR1079

Standard

Aircraft Noise Level Reduction Measurement of Building Façades

2021-04-14

CURRENT

ARP6973

This Aerospace Recommended Practice (ARP) provides two methods for measuring the aircraft noise level reduction of building façades. Airports and their consultants can use either of the methods presented in this ARP to determine the eligibility of structures exposed to aircraft noise to participate in an FAA-funded Airport Noise Mitigation Project, to determine the treatments required to meet project objectives, and to verify that such objectives are satisfied.

Standard

TYPE MEASUREMENTS OF AIRCRAFT INTERIOR SOUND PRESSURE LEVELS IN CRUISE

1978-02-01

HISTORICAL

ARP1323

Recommendations of this Aerospace Recommended Practice (ARP) are not intended to satisfy the more detailed and stringent requirements of aircraft design development. Also, they may not be directly applicable to general or private aviation aircraft where special restraints on measurement locations and procedures may exist. However, many of the principles and standards discussed may apply to these aircraft. The recommended procedure for sound pressure level measurements in aircraft involves the recording of data on magnetic tape for subsequent processing and analysis after the flight. Sound level meter/octave-band analyzer measurements, because of inherent inaccuracies associated with manual data readings, are not as precise as those obtained from a tape-recorder/time integrating analyzer system and are, therefore, precluded from this recommended practice.

Standard

Type Measurements of Airplane Interior Sound Pressure Levels During Cruise

2012-08-16

CURRENT

ARP1323B

The primary measurement procedure recommended in this ARP includes the recording of sound pressure signals in the interior of an airplane during steady state cruise conditions with analysis after the flight into octave band (or one-third octave band) sound pressure levels.

Standard

TYPE MEASUREMENTS OF AIRPLANE INTERIOR SOUND PRESSURE LEVELS DURING CRUISE

1990-08-01

HISTORICAL

ARP1323A

The primary measurement procedure recommended in this ARP includes the recording of sound pressure signals in the interior of an airplane during steady state cruise conditions with analysis after the flight into octave band (or one-third octave band) sound pressure levels.

Standard

PRACTICAL METHODS TO OBTAIN FREE-FIELD SOUND PRESSURE LEVELS FROM ACOUSTICAL MEASUREMENTS OVER GROUND SURFACES

1981-03-01

HISTORICAL

AIR1672A

Standard

Practical Methods to Obtain Free-Field Sound Pressure Levels from Acoustical Measurements Over Ground Surfaces

2012-07-12

HISTORICAL

AIR1672B

Standard

Practical Methods to Obtain Free-Field Sound Pressure Levels from Acoustical Measurements Over Ground Surfaces

2020-12-21

CURRENT

AIR1672C

Standard

PRACTICAL METHODS TO OBTAIN FREE-FIELD SOUND PRESSURE LEVELS FROM ACOUSTICAL MEASUREMENTS OVER GROUND SURFACES

1980-09-01

HISTORICAL

AIR1672

Standard

PREDICTION PROCEDURE FOR NEAR-FIELD AND FAR-FIELD PROPELLER NOISE

1977-05-01

HISTORICAL

AIR1407

Standard

Prediction Procedure for Near-Field and Far-Field Propeller Noise

2012-08-16

CURRENT

AIR1407A

Standard

GAS TURBINE COAXIAL EXHAUST FLOW NOISE PREDICTION

1995-09-19

HISTORICAL

AIR1905