STEP PFM
(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 25th to 27th of May 2016.
(a)
(b)
(2) The thermal cycling tests on STEP PFM were performed successfully from6th to 13th of June 2016.
(3) The acceptance EMC tests were performed successfully from 15th to 23th of June 2016.