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F.5.1 Primary Structure

F.5.1.1 The Primary Structure must be constructed from one or a combination of the following:

Steel Tubing and Material F.3.2 F.3.4

Alternative Tubing Materials F.3.2 F.3.5

Composite Material F.4

F.5.1.2 Any chassis design that combines the Tube Frame, Monocoque, tubing and/or composite types must meet all relevant requirements.

For example, a sandwich panel Side Impact Structure in a tube frame chassis