Standard:

• ARP987
• Revision: A

Reaffirmed:

• 2003-10-31

Revised:

• 1997-10-01

Revision:

• Historical. Access the latest revision: ARP987B

Issuing:

• Ac-9 Aircraft Environmental Systems Committee

Scope:

The purpose of this document is threefold: (1) to review the problem of 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 adverse effects of moisture.

The problem of moisture in avionics has been brought into focus by the widespread use of air cycle refrigeration in forced-cooled "black-boxes," and by the lack of recognition of the moisture sensitivity of most avionic circuitry.

This document does not relieve the avionics designer of his obligation to meet any other humidity requirements which may be applicable to the avionics. Because the air conditioning system is inoperative when the aircraft is parked or stored, the aircraft and its equipment must withstand the effects of the outdoor environment (e.g., humidity, fog, rain, and surface condensation).

History:

Standard	Published	Revision	Status
ARP987B	2010-06-17	Latest	Revised
ARP987A	1997-10-01	Historical	Reaffirmed
ARP987	1970-03-01	Historical	Issued

AKA:

• SAE ARP 987

Sector:

• Aerospace

Topic:

• Avionics
• Human Factors
• Environmental control systems
• Air conditioning
• Air supply
• Cabin pressurization
• Smoke detection
• Passenger compartments
• Cooling
• Noise
• Safety
• Tests and Testing