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

DFH 4 Series Spacecraft Date : 28 Sept 2014
Page 33 of 38

10. REVIEW OF THE IN ORBIT DATA AND FINDINGS

You will find in this paragraph a quick review of the in orbit data and assessment already performed on the satellites
series DFH x, from various programs. Since most of the documents have been already reviewed by other persons, the
added value of this paragraph is questionable, nevertheless it should be considered as a tentative assessment.

Document or Observation / Event Comment /Assessment
program
 ST O2 Power BCR failure on Chinasat 11  No explanation on the reasons as well as on the induced
modification if any
 BE01: Payload TWT Helix current  No explanation. It may impact all the Ku TWT. As you
may have seen there was also an issue on the Anode
Voltage abnormal behaviour in 2012. But what was the
conclusion on these abnormal behaviour and their
impacts.
Fleet renewal
 Br06 Power  Is it really a single event? What could be the
component failure?
 TAS recommend to work with PMB is fine for this
satellite. But does TAS have investigated more deeply
 AT 02: STR issue not clear. the issue.
 Is the division by zero is considered as a software bug or
triggered by an event (SEU or other event)
Chinasat 11 In  To consider the BCR failure/issue as being a random
orbit anomaly  Power, ETCA PCU , BCR anomaly event is quite a quick answer from TAS. I presume that
TAS has looked more deeply this problem. What is the
ETCA PCU resulting modification on the new units? How they have
failure been qualified?
VENASAT
(Report de
salud  Very good document, the Venasat behaviour Just one point which should be better explained is linked
trimestrial seems good. with the remarks on the SADA offset angle
Mar-May
2014)

Sinosat 6
Health report Helium leakage during LEOP (see par 1-2-2). I believe that
Everything seems Ok this has already been taken in the following satellite design.
(APR 2013-
We can expect that what has been proposed is all right.
Apr 2014)

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