Hydrostatic release units, other than disposable hydrostatic
release units, shall be serviced:
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.1 at intervals not exceeding 12 months, provided
where in any case this is impracticable, the Administration may extend
this period to 17 months;footnote and
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.2 at a servicing station which is competent to
service them, maintains proper servicing facilities and uses only
properly trained personnel.