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Aircraft Structure Zoning System

Major Zone

100 Lower half of the fuselage to the rear pressure bulkhead (below the main cabin deck).

200 Upper half of the fuselage to the rear pressure bulkhead.

300 Empennage, including fuselage aft of the rear pressure bulkhead.

400 Power plants and struts or pylons.

500 Left wing.

600 Right wing.

700 Landing gear and landing gear doors.

800 Doors.

900 Reserved for uncommon differences between aircraft types not covered by standard series numbers.

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