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SAE ARP987 Revision B, June 1, 2010
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(R) The Control of Excess Humidity in Avionics Cooling
Includes all amendments and changes through Reaffirmation Notice , October 2015
Page Count:21
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AIA/NAS Aerospace Standards
This Aerospace Recommended Practice (ARP) outlines the causes and impacts of moisture and/or condensation in avionics equipment and provides recommendations for corrective and preventative action. 


The purpose of this document is threefold: (1) to review the issues associated with moisture in avionics equipment, (2) to outline methods for correcting conditions of excess moisture in existing avionics installations, and (3) to recommend design practices for new avionics cooling system installations which will minimize the occurrences of excess moisture in avionics.

This document does not address all moisture-related requirements which may be applicable to the avionics installation. For instance, when the air conditioning system is inoperative when the aircraft is parked or stored, or if an avionics ground cooling fan is employed, the aircraft and its equipment will be exposed to and must withstand the effects of the outdoor environment (e.g., high humidity, fog, rain, and surface condensation).

Field of Application

This document is intended to apply to design of airborne avionics equipment cooling systems.