(a) The owner or operator may use a new maintenance record, without
previous operating history, for an aircraft engine rebuilt by the
manufacturer or by an agency approved by the manufacturer.
(b) Each manufacturer or agency that grants zero time to an engine
rebuilt by it shall enter in the new record --
(1) A signed statement of the date the engine was rebuilt;
(2) Each change made as required by airworthiness directives; and
(3) Each change made in compliance with manufacturer's service
bulletins, if the entry is specifically requested in that bulletin.
(c) For the purposes of this section, a rebuilt engine is a used engine
that has been completely disassembled, inspected, repaired as necessary,
reassembled, tested, and approved in the same manner and to the same
tolerances and limits as a new engine with either new or used parts.
However, all parts used in it must conform to the production drawing
tolerances and limits for new parts or be of approved oversized or
undersized dimensions for a new engine.