i. A fireproof barrier separating the engine into various temperature zones. The cool zone houses the fuel, oil, hydraulic, and electrical components, along with their associated systems. The zones may be maintained at different pressures to prevent the spread of any fire from the hot zone.
ii. Any transverse partition in the fuselage at a right angle to the longitudinal axis to the body, serving to strengthen, divide, or help give shape to the structure. In the process, it divides the body into two parts.

Aviation dictionary. 2014.

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