Page 38 - test

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

DFH 4 Series Spacecraft Date : 28 Sept 2014
Page 36 of 38

11. SUMMARY AND CONCLUSION

As a summary, although the other documents give confidence on their design and the in orbit follow and on the resulting
mission success this document 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. 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.
The main concerns identified are:

 The qualification status of each unit is questionable.
 The resources allocated to the various programs need to be clarified.
 The testing resources to handle all the programs in parallel need to be clarified.
 How the lessons learned from previous programs (anomalies or success) is taken into consideration for the
ongoing programs.
 The procurement of parts / units subject to export control / ITAR restrictions need to be clarified.
 The development of the Electrical propulsion is challenging Li Ion and some late discoveries of issues are
expected.
For the spacecraft under consideration for this study:
 LAOSAT DFH 4S: should be not too challenging and achievable in the proposed schedule with some challenges
(Li ion battery).
 CHINASAT 9 DFHS 4: should be not too challenging and achievable in the proposed schedule with some effort
to confirm the real qual status
 CHINASAT 16 DFHS 4 S: More than challenging program with Electrical propulsion difficult Ka band mission
and complex antenna. To help an additional peggy back payload. Schedule not credible, lost of confidence in the
presentation. Organization to be précised
 CHINASAT 18 DFE 4E: Specification and requirements not yet defined cannot be assessed with the
information provided, but challenging for the power increase.

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