(1) After confirmation of the slippage during the STEP PQM vibration tests, it was decided that STEP follows a PFM approache for

the vibration tests. (a) In order to mitigate the slippage in PFM, some interface bolts were changed to increase the compression

force between the relevant subassemblies. (b) Also, the notching that had been applied for PQM was modified in Z-axis vibration

to mitigate any damage risk to the flight hardware. After all, the vibration tests on STEP PFM were performed

successfully from 25^th to 27^th of May 2016.

(a)

(b)

(2) The thermal cycling tests on STEP PFM were performed successfully from6^th to 13^th of June 2016.

(3) The acceptance EMC tests were performed successfully from 15^th to 23^th of June 2016.