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Ref : CM-DFH4-2014-1
BEAZLEY Issue : 1

DFH 4 Series Spacecraft Date : 28 Sept 2014
Page 35 of 38

 DFH 4 includes the new Pyro valves and the modified SADA. It seems that it includes IMUX from Cast with a
dielectric technology. On TKsat it seems that they include for the payload a mix of TAS Rx and CAST ones as
well as a mix for LCTWTA!

10.2 SUMMARY OF THE IN ORBIT ANOMALIES AND DFH EVOLUTION

As a summary, although the other documents give confidence on their design and the in orbit follow and on the resulting
mission success these documents above raises the doubt, and demonstrate that perhaps the presentation documents are
biased and are not giving the full story and as such induce doubts for the writer of this document. It should be highly
desirable to have a better understanding on the design and qualification of all the units in order to be able to track the
modifications they have introduced in the design for each of them, the reasons for the modifications and the resulting
necessary delta qualification that they should have performed. For the new equipment what they have done to qualify
them (battery, SADA, IMUX, TWT AOCS SW etc ...). Each issue in orbit should be addressed even the ones which have
leaded to a loss of the satellite.

The qualification status and the categorization of the units (A to D), is still questionable. Often they state is qualified in
orbit by reference to a different satellite (i.e. LEO). Without knowing all the evolutions on a piece of hardware, a small
change can invalidate a qualification, just to say that the qualification by similarity can lead to wrong conclusions.

It is not clear how the cross fertilization between programs and lesson leaned are implemented at CAST.

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