scope:

This standard establishes requirements for thermal design and cooling analyses, thermal design verification tests, and preproduction qualification tests for airborne electronic equipment. These thermal design requirements are provided to ensure that the equipment will operate satisfactorily without manual adjustment under any mode of operation in the aircraft. It also establishes guidelines for test methods for verification testing of the thermal and cooling design and preproduction qualification temperature and humidity tests to ensure that the equipment meets its performance requirements and reliability criteria. This document defines a thermal design process establishing and validating the following:

a. Equipment cooling methods and coolant flow requirements.

b. Allowable component temperature and component power, based on derating requirements to achieve lowest component temperatures consistent with reliability and life cycle cost (LCC) requirements.

c. A thermal design analysis which defines the temperatures, heat sources, heat paths and heat sinks of all temperature critical components for worst-case power, environmental temperature-altitude and coolant flow (where applicable) conditions.

d. Thermal design, verification and preproduction qualification tests.

Application of this document is via tailoring. Department of Defense (DOD) policy is to selectively apply and tailor standardization documents to ensure their cost-effective use in the acquisition process. Individual requirements (sections, paragraphs or sentences) shall be evaluated to determine the extent to which they are most suitable for a specific acquisition and the modification of these requirements to ensure that each achieves an optimal balance between needs and cost. Tailoring of data requirements consists only of the exclusion of those sections, paragraphs or sentences in an approved document's information requirement or Data Item Description (DID). Each program office should carefully consider within DOD and Service guidelines, the benefits and costs of imposing this standard on each specific acquisition. Contractors may propose specific application and tailoring of this document and related information requirements (DIDs, etc.) as specified in 6.1.

Data associated with compliance to this standard shall be in accordance with 4.5 and 6.2.

intended Use: