8A.1 All mechanical float free arrangements shall
be serviced at intervals of not more than 12 months. Where the mechanical
float free arrangement is a hydrostatic release unit, it shall be
serviced:
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.1 at intervals not exceeding twelve months; however,
in cases where it appears proper and reasonable, the Administration
may extend this period up to a maximum of eighteen months;
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.2 at an approved service station which is competent
to service them, maintains proper servicing facilities and uses only
properly trained personnel.