Method and apparatus for impeller retention during assembly of a turbine engine

A retaining finger assembly for a retention ring of an assembly fixture, the retaining finger assembly comprising:

• a retaining finger slidably engaged at a top surface of the retention ring for radial translation between an extended position and a retracted position, with respect to a center of the retention ring;
• and
• a translation-limiting member comprising a coupling feature and a first surface disposed substantially perpendicular to the top surface of the retention ring, wherein:
• the coupling feature is configured to couple the translation-limiting member to the retention ring at a location corresponding to the retaining finger;
• and
• the first surface is configured to directly abut a second surface of the retaining finger in the extended position and block the radial translation of the retaining finger.

A retention ring of an assembly fixture for a gas turbine engine, the retention ring comprising:

• a top surface having an inner perimeter and an outer perimeter;
• a plurality of retaining fingers disposed circumferentially around the top surface and at least partially between the inner perimeter and the outer perimeter, wherein each of the plurality of retaining fingers is slidably engaged with the top surface for radial translation, with respect to a center of the retention ring, between an extended position and a retracted position;
• and
• at least one translation-limiting member comprising a coupling feature and a first surface disposed substantially perpendicular to the top surface, wherein:
• the coupling feature is configured to couple the translation-limiting member to the retention ring at a location corresponding to a respective retaining finger of the plurality of retaining fingers;
• and
• the first surface is configured to directly abut a second surface of the respective retaining finger in the extended position and block the radial translation of the respective retaining finger.