The test method you are referring to is 2.4.36 Rework Simulation,
Plated-Through Holes for Leaded Components

This is available on the IPC website for free downloading.  The most
recent rev is B.

In the scope of the method it explains that the 5 heating steps are
designed to simulate initial soldering after a preconditioning bake and
two (2) subsequent replacements.

Both MIL-PRF-55110 and IPC-6012 use this method.

Susan Mansilla
Robisan Lab

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