Section 131.585 - Periodic servicing of hydrostatic-release units(a) Except a disposable hydrostatic-release unit with an expiration date, each hydrostatic-release unit must be serviced-(1) Within 12 months of its manufacture and within 12 months of each subsequent servicing, except when a servicing due after 12 months is delayed not more than 5 months until the next scheduled inspection of the vessel; and(2) In compliance with subpart 160.062 of this chapter.(b) The springs of each spring-tensioned gripe used with a hydrostatic-release unit must be renewed when the unit is serviced and tested.