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This document considers the cooling of equipment installed in equipment centers, which usually consist of rack-mounted equipment and panel mounted equipment in the flight deck. Instances where these two locations result in different requirements are identified. This document generally refers to the cooled equipment as E/E equipment, denoting that both electrical and electronic equipment is considered, or as an E/E equipment line-replaceable-unit (LRU). The majority of cooled equipment takes the form of LRUs. The primary focus of this document is E/E equipment which uses forced air cooling to keep the equipment within acceptable environmental limits. These limits ensure the equipment operates reliably and within acceptable tolerances. Cooling may be supplied internally or externally to the E/E equipment case. Some E/E equipment is cooled solely by natural convection, conduction, and radiation to the surrounding environment.

This Aerospace Recommended Practice (ARP) defines tests to be performed on hydraulically, electrically, pneumatically, and mechanically actuated air valves. They may be further defined as those valves that function in response to externally applied forces or in response to variations in upstream and/or downstream duct air conditions in order to maintain a calibrated duct air condition (e.g., air flow, air pressure, air temperature, air pressure ratio, or air shutoff).

These recommendations apply to the user's manual for any computer program pertaining to aircraft ECS. This includes computer programs for: a Cabin air conditioning and pressurization performance. b Avionics equipment cooling system performance. c Engine bleed air system performance. d Compartment and equipment thermal analysis. e Environmental protection system performance. These recommendations apply to user's manuals for generalized computer programs as well as those for a specific component or system.

These recommendations are written to cover the general requirements of helicopter air conditioning and are sub-divided as follows: (1) Air Conditioning System - Dealing with the general design aspects. (2) Air Conditioning Equipment - Design requirements for satisfactory system function and performance. (3) Air Conditioning System Design Requirements -General information for use of those concerned in meeting requirements contained herein.

This publication formalizes the applicable design concepts considered acceptable for "draw-through" cooling of electronic (avionic) equipment installed in subsonic and supersonic commercial jet transports. Methods other than draw-through cooling are covered in AIR 728A for high Mach number aircraft.

Recommendations of this ARP refer specifically to the application of closed cycle vapor cycle refrigeration systems as a source of cooling in an aircraft air conditioning system. General recommendations for an air conditioning system which may include a vapor cycle system as a cooling source are included in ARP 85, Air Conditioning Equipment, General Requirements for Subsonic Airplanes, ARP 292, Air Conditioning, Helicopters, General Requirements For, and AIR 806, Air Conditioning Design Information for Cargo and High Density Passenger Transport Airplanes, and are not included herein.

Air Conditioning System - General - Dealing with Design Features

These recommendations cover the general field of airplane cabin pressurization equipment and are subdivided as follows: GENERAL REQUIREMENTS FOR PRESSURIZED AIRPLANES CABIN AIR COMPRESSORS CABIN PRESSURE REGULATING EQUIPMENT ENGINE BLEED AIR DUCT SYSTEMS CABIN PRESSURE DUCTING SYSTEM

These recommendations cover the general field of airplane cabin pressurization equipment and are subdivided as follows: GENERAL REQUIREMENTS FOR PRESSURIZED AIRPLANES CABIN AIR COMPRESSORS CABIN PRESSURE REGULATING EQUIPMENT ENGINE BLEED AIR DUCT SYSTEMS CABIN PRESSURE DUCTING SYSTEM

These recommendations are written to cover automatic cabin temperature controls under three classifications, namely: