14 CFR §47.13

1. (a)Each person signing an Aircraft Registration Application, AC Form 8050-1, or a document submitted as supporting evidence under this part, must sign in ink or by other means acceptable to the FAA. If signed in ink, the Aircraft Registration Application must also have the typed or legibly printed name of each signer in the signature block.
2. (b)When one or more persons doing business under a trade name submits an Aircraft Registration Application, a document submitted as supporting evidence under this part, or a request for cancellation of a Certificate of Aircraft Registration, the application, document, or request must be signed by, or on behalf of, each person who shares title to the aircraft.
3. (c)When an agent submits an Aircraft Registration Application, a document submitted as supporting evidence under this part, or a request for cancellation of a Certificate of Aircraft Registration, on behalf of the owner, that agent must—
   1. (1)State the name of the owner on the application, document, or request;
   2. (2)Sign as agent or attorney-in-fact on the application, document, or request; and
   3. (3)Submit a signed power of attorney, or a true copy thereof certified under § 49.21 of this chapter, with the application, document, or request.
4. (d)When a corporation submits an Aircraft Registration Application, a document submitted as supporting evidence under this part, or a request for cancellation of a Certificate of Aircraft Registration, it must—
   1. (1)Have an authorized person sign, by means acceptable to the FAA, the application, document, or request;
   2. (2)Show the title of the signer's office on the application, document, or request; and
   3. (3)Submit a copy of the authorization from the board of directors to sign for the corporation, certified as true under § 49.21 of this chapter by a corporate officer or other person in a managerial position therein, with the application, document, or request, unless—
      1. (i)The signer of the application, document, or request is a corporate officer or other person in a managerial position in the corporation and the title of his office is stated in connection with his signature; or
      2. (ii)A valid authorization to sign is on file at the Registry.
   4. (4)The provisions of paragraph (d)(3) of this section do not apply to an irrevocable deregistration and export request authorization when an irrevocable deregistration and export request authorization under the Cape Town Treaty is signed by a corporate officer and is filed with the Registry.
5. (e)When a partnership submits an Aircraft Registration Application, a document submitted as supporting evidence under this part, or a request for cancellation of a Certificate of Aircraft Registration, it must—
   1. (1)State the full name of the partnership on the application, document, or request;
   2. (2)State the name of each general partner on the application, document, or request; and
   3. (3)Have a general partner sign the application, document, or request.
6. (f)When co-owners, who are not engaged in business as partners, submit an Aircraft Registration Application, a document submitted as supporting evidence under this part, or a request for cancellation of a Certificate of Aircraft Registration, each person who shares title to the aircraft under the arrangement must sign the application, document, or request.
7. (g)A power of attorney or other evidence of a person's authority to sign for another, submitted under this part, is valid for the purposes of this section, unless sooner revoked, until—
   1. (1)Its expiration date stated therein; or
   2. (2)If an expiration date is not stated therein, for not more than 3 years after the date—
      1. (i)It is signed; or
      2. (ii)The grantor (a corporate officer or other person in a managerial position therein, where the grantor is a corporation) certifies in writing that the authority to sign shown by the power of attorney or other evidence is still in effect.