Federal Aviation Regulations
Sec. 21.473 — Airworthiness certificates other than experimental.
For each amendment made to a standard airworthiness certificate under this subpart, the DAS shall follow the procedure manual prescribed in §21.441 and shall, before making that amendment—(a) Complete each flight test necessary to meet the applicable airworthiness requirements of this chapter;
(b) Find that each applicable airworthiness requirement of this chapter is met; and
(c) Find that the aircraft is in condition for safe operation.
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