46 C.F.R. § 185.728 Testing and servicing of Emergency Position Indicating Radiobeacons (EPIRB).
Title 46 - Shipping
The master of the vessel shall ensure that: (a) Each EPIRB, other than an EPIRB in an inflatable liferaft, must be tested monthly, using the integrated test circuit and output indicator, to determine that it is operative; (b) The EPIRB's battery is replaced after it is used, or before the date required by FCC regulations in 47 CFR part 80, whichever comes sooner; and (c) The EPIRB test required by paragraph (a) shall be logged or otherwise documented, as applicable. [CGD 85–080, 61 FR 1005, Jan. 10, 1996, as amended by CGD 97–057, 62 FR 51050, Sept. 30, 1997]
Title 46: Shipping
PART 185—OPERATIONS
Subpart G—Operational Readiness, Maintenance, and Inspection of Lifesaving Equipment
§ 185.728 Testing and servicing of Emergency Position Indicating Radiobeacons (EPIRB).

