This paragraph is only intended to apply to the main structure
of the craft. Appendages such as air propellers, air ducts to propellers,
transmission shafts, rudders and other control surfaces, struts, spars,
flexible skirts, etc., are not intended to be of fire restricting
or non-combustible material, therefore 7.4.1.3 should not apply to
them.
Figure 7.3-1
Figure 7.3-2
Figure 7.3-3