My timeline:
ITA: Jan 11, 2017
E-APR & AOR: March 5, 2017;
Medical passed: March 27, 2017;
Background check In progress for the first time: March 27, 2017;
Background check changed back to Not Applicable: March 28, 2017;
Schedule A request: March 31, 2017;
Schedule A submitted: April 5, 2017;
Background check changed to In progress again: April 6, 2017;
PPR: April 7, 2017.