scope:

Use/relationship: The Machinery and Equipment Pre-Installation Airborne Sound Measurements Test Report provides a description of the airborne sound tests and results in order to demonstrate compliance with the requirements of MIL-STD-1474.

a. This Data Item Description (DID) contains the format, content, and preparation instructions for that data generated as specified in MIL-STD-1474 and ANSI/ASA S12.67, Pre-Installation Airborne Sound Measurements and Acceptance Criteria of Shipboard Equipment.

b. This DID shall be applied for each machinery and equipment item with an airborne noise requirement, excluding fans, fan-coil units, fan-coil assemblies, air handling units, and other air moving devices when MIL-STD-1474 and ANSI/ASA S12.67 is invoked in the contract specifications or statement of work.

c. The data reported by this DID may be used to support the analysis and design development described in DI-HFAC-81278, Airborne Noise Analysis and Control Design History Booklet.

d. This DID supersedes DI-HFAC-80272.