The period of accreditation shall not exceed three years. Applications for renewal of accreditation shall be made on the same form as described in §1919.3. No accreditation shall expire until action on an application for renewal shall have been finally determined, provided that such application has been properly executed in accordance with §1919.3 and filed with and received by the Assistant Secretary not less than 15 nor more than 60 days prior to the expiration date. A final determination means either the approval or initial denial of the application for renewal. The procedure specified in §1919.4 shall be applicable to all applications for renewal.