8900.1 Vol. 5 Ch. 2 Sec. 5

An airman may temporarily deposit an airman certificate voluntarily in the custody of a FSDO (for a maximum of 30 days at a time) while the airman is preparing for a reexamination of competence. ... without the use of American Sign Language or other aid, then the person may be eligible for removal of the: ... I am unable to surrender my airman ... ................
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