91.611 Inspection planning latitude
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(a) Unless expressly prohibited by these rules, an airworthiness directive,
or a manufacturer's mandatory inspection requirement, the inspection
intervals required by rule 91.605 may be extended by up to 10% to allow
for maintenance planning purposes.
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(b) If the extension provisions of paragraph (a) are applied to an
aircraft--
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(1) the new extended date, or aircraft operating hours or cycles,
whichever is applicable, for the inspection must be recorded in
the appropriate maintenance logbook or technical log; and
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(2) the next required inspection interval must start from the
beginning of the extension period to ensure that any extension
that is applied to an inspection interval is not cumulative.