FAR code for factor of safety
25.303
FAR code for strength and deformation
25.305
FAR code for proof of structure
25.307
FAR code for limit and ultimate loads
23.2230
FAR code for structural strength
23.2235
FAR code for structural durability
23.2240
FAR code for loads
25.301
FAR code for leveling means
25.871
FAR code for engines
25.903
FAR code chapter for normal category rotorcraft
27
behind numbers are the same
FAR code chapter number for transport category rotorcraft
29
behind numbers are the same
FAR code for fabrication methods
25.605
FAR code for fasteners
25.607