§29.21 Proof of compliance

Each requirement of t his Subpart m ust be m et at each appropriate combination of weight and centre of gravity within th e ran ge o f lo ading conditions for whi ch cert ification i s requested. This must be shown: (a) By tests upon a rot orcraft of t he t ype for which certification is requested, or by calculations based on, and equal in accuracy to, the results of testing; and (b) By system atic investigation of each required com bination of wei ght and centre of gravity, i f com pliance cannot be reasonably inferred from combinations investigated.