scope:

This European Standard specifies requirements and determination methods for newly certificated commercial civil passenger aircraft programmes regarding integrated air quality parameters and cabin air pressure.

This European Standard is intended to apply to newly certificated commercial civil passenger aircraft programmes. It may also apply to current production aircraft if it does not carry significant burden, i.e. if it can be shown to be technically feasible and economically justifiable.

This European Standard covers the period for each flight when the first crewmember enters the aircraft until the disembarkation of the last crewmember.

NOTE 1 During embarkation and disembarkation, reduced temperatures in the cabin may be desirable due to increased metabolic activity of the occupants. In some ground cases, the aircraft environmental control system (ECS) may not be able to compensate for the external conditions influencing the cabin comfort conditions, such as open doors, extreme hot/cold ground/air temperatures or radiant heat. In this case, external air-conditioning systems, for example conditioned low-pressure ground air or high-pressure supply, may be used to supplement the aircraft ECS. If the temperature range stated in this European Standard is regularly exceeded (either above or below the stated range), changes to airline and/or airport procedures and/or aircraft design should be introduced.

NOTE 2 During ground operations, the external air quality may adversely influence the air quality within the aircraft cabin. Contamination produced as a result of servicing activities or ground operations may enter the aircraft directly, for example via open doors, and the ECS may not be able to effectively control contaminant levels in the cabin. Airline and airport operational procedures should be organised so as to avoid direct contamination of the cabin from these pollutant sources. If the contaminant ranges stated in this European Standard are regularly exceeded, changes to airline and/or airport procedures and/or aircraft design should be introduced.

Outside air quality levels would usually be regulated by national authorities.

Individual predisposition may influence the proposed values and limits.

prEN 4666 is a self-standing standard, independent from EN 4618 or any other similar subject documents.

This European Standard covers data for:

- Pressure Conditions (air pressure rate of change, absolute cabin air pressure)

- Thermal Conditions (air temperature, surface temperature, draught)

- Humidity Conditions - Noise and Vibration

- Combined Effects

as newly developed by the European study "ICE - Ideal Cabin Environment" (European Contract No. AST4- CT-2005-516131) and its related findings.