14 C.F.R. § 450.35 – Means of compliance.

(a) Prior to application acceptance, a means of compliance must be accepted by the Administrator for the following:
1. (1) Section 450.115(b)(1) regarding flight safety analyses;
2. (2) Section 450.139(e)(1) regarding toxic hazards for flight;
3. (3) Section 450.145(b) regarding highly-reliable flight safety system;
4. (4) Section 450.163(a)(1) regarding lightning hazard mitigation; and
5. (5) Section 450.187(e)(1) regarding toxic hazards mitigation for ground operations.
(b) A person requesting acceptance of a proposed means of compliance outside a license application must submit the proposed means of compliance to the FAA in a form and manner acceptable to the Administrator.