Design Day/Year:
APPENDIX B
GLOSSARY
The busy day or planning year selected as the appropriate period for defining a volume of traffic to be used as the basis for determining facility require- ments or noise impact.
Flight Envelopes:
The tubes of airspace, defined by International Civil Aviation Organization documents, within which standard flight procedures can be developed.
Noise Exposure Forecast (NEF):
A descriptor of total noise impact, measured in abstract units, which is a composite of air traffic volumes, aircraft types, flight characteristics, runway utilization, and diurnal patterns of demand on a selected design day.
Operational Busy Hours:
The hours of the design day when the demand for air traffic services is at or near the peak level.
Person Trips:
The number of persons travelling to or from a facility via any mode in a specified time period.
Planning Horizon:
The end date specified as the point in time for which facility requirements are to be determined.
Route Sector:
A segment of a planned route within a system of air routes, usually referring to an origin and destination between which the aircraft operates without stopping.
Standard Busy Rate:
The demand for passenger movements or aircraft operations in the 30th busiest hour of the year.
Vehicle Trips:
The number of vehicles travelling to or from a facility in a specified time period.
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RMP PARSONS OVERSEAS COMPANY • WILBUR SMITH & ASSCHLAZE
• GOLLINS MELVIN WARD PARTNERSHIP • CIVIL AVIATION AUTHORITY (UK)
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