The zoning of large aircraft is specified by the Airline for America (A4A) in the ATA-100 Specification. These large areas or major zones are further divided into sequentially numbered zones and subzones. A zone is identified by one of three indicators, depending upon whether it is a major zone, major sub-zone, or simply a zone. Major zones are identified by three-digit numbers as follows:

Aircraft Major Zones

Major Zones
Major ZoneArea
100Lower half of the fuselage to the rear pressure bulkhead
200Upper half of the fuselage to the rear pressure bulkhead
300Empennage, including fuselage aft of the rear pressure bulkhead
400Power plants and struts or pylons
700Landing gear and landing gear doors
900Reserved for uncommon differences between aircraft types not covered by standard series numbers

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