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Principal Airframe Parts (Helicopter) In general, the airframe structure for helicopters follows the basic principles of airframe structure for airplanes. For this reason, and to maintain simplicity in the descriptions, airframe discussion in the paragraphs that follow is limited to the single-rotor helicopter. Cabin and Tail Cone Sections. A typical single-rotor helicopter is composed of two major sections: the cabin and tail cone. The cabin section contains compartments with space for the crew, passengers, cargo, fuel and oil tanks, controls, and powerplant. However, in multiengine helicopters the power plants may be mounted in separate engine nacelles. The tail cone section and landing gear are attached to the cabin section so that they can be removed, inspected, repaired when necessary, and replaced. The cabin is strong enough at points of attachment to withstand the forces involved in taking off, flying, and landing. The size and arrangement of compartments and the section construction vary with different types and manufacturers of helicopters. Figure 1-9 illustrates the cabin structure of a utility helicopter (UH-1). Notice that the structure is basically semimonocoque with variations to strengthen areas of high stress. The tail cone (boom), shown in Figure 1-10, attaches to the cabin and supports the tail rotor, tail-rotor drive shafting, and stabilizers. Stabilizer. The airfoils attached to the tail cone to increase stability about the longitudinal and lateral axes of the aircraft during flight are stabilizers. Stabilizer construction is also semimonocoque. 
Figure 1-9. Cabin Section (UH-1D).
Figure 1-10. Tail Cone Section (UH-1).
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