Aircraft zoning makes identification easier during maintenance and repair of aircraft.

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.

Aircraft Major Zones

Aircraft Major Zones

Major zones are identified by three-digit numbers as follows:

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

9 Major Zones Explained

Aircraft are divided into major zones for ease of identification, maintenance, and repair. These zones are standardized across the industry, with each zone having a specific code assigned to it.

  • 100 – Nose: This zone encompasses the forward fuselage section, including the radome (which houses the radar antenna), cockpit, and avionics bay.
  • 200 – Fuselage: This zone includes the passenger cabin, the galley, and the lavatories. It is further divided into subzones, such as the forward fuselage, the mid-fuselage, and the aft fuselage.
  • 300 – Empennage: This zone includes the tail section of the fuselage. This zone includes the horizontal and vertical stabilizers, as well as the rudder and elevators.
  • 400 – Powerplant: This zone includes the engines, as well as the nacelles and pylons.
  • 500 – Left Wing: This zone includes the left wing, the left aileron, and the left flap.
  • 600 – Right Wing: This zone includes the right wing, the right aileron, and the right flap.
  • 700 – Landing Gear: This zone includes the landing gear, the landing gear doors, and the wheels.
  • 800 – Doors: This zone includes all of the passenger doors, cargo doors, and service doors.
  • 900 – Reserved: This zone is reserved for uncommon differences between aircraft types that are not covered by standard zones.
Major Zones

Benefits of Aircraft Zoning

  • Common zoning systems facilitate clear and concise communication between the various stakeholders involved in aircraft maintenance and repair.
  • Zoning helps in pinpointing the location of problems and components during maintenance, saving time and effort.
  • These zones help in the maintenance and repair of the aircraft. They allow technicians to locate and identify parts of the aircraft more easily.
  • By understanding the location and function of different zones, maintenance personnel can work more safely and effectively.

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