14 C.F.R. § 61.27 – Voluntary surrender or exchange of certificate.

(a) The holder of a certificate issued under this part may voluntarily surrender it for:
1. (1) Cancellation;
2. (2) Issuance of a lower grade certificate; or
3. (3) Another certificate with specific ratings deleted.
(b) Any request made under paragraph (a) of this section must include the following signed statement or its equivalent: “This request is made for my own reasons, with full knowledge that my (insert name of certificate or rating, as appropriate) may not be reissued to me unless I again pass the tests prescribed for its issuance.”