D4S Revised Technica

SUPPLEMENT submitted by DIRECTV Enterprises, LLC

D4S Revised Technical Suppplement

2012-05-08

This document pretains to SAT-MOD-20111102-00211 for Modification on a Satellite Space Stations filing.

IBFS_SATMOD2011110200211_951123

May 8, 2012 BY ELECTRONIC FILING Marlene H. Dortch, Secretary Federal Communications Commission 445 Twelfth Street, S.W. Washington, DC 20554 Re: IBFS File No. SAT-MOD-20111102-00211 Dear Ms. Dortch: On January 5, 2012, DIRECTV Enterprises, LLC (“DIRECTV”) provided supplemental technical information in the above referenced proceeding with respect to the approximate amount of residual helium and xenon gas that cannot be vented at the end of operational life of the DIRECTV 4S spacecraft. Unfortunately, the mass figure provided for the helium tanks was erroneous. In addition, the data previously reported assumed a worst-case scenario under which the XIPS propulsion system did not further deplete the supply of xenon. The chart below provides the correct information for helium and adjusted figures for xenon assuming the XIPS system continues to function through the satellite’s end of life. TANK VOLUME (M3) PRESSURE (KPA) TEMP. (° C) MASS (KG) HE1 0.0427 1671.4 20 0.1149 HE2 0.0427 1671.4 20 0.1150 XE1 0.0327 206 20 0.3900 XE2 0.0327 206 20 0.3900 Should you have any questions, please do not hesitate to contact me. Respectfully submitted, /s/ William M. Wiltshire Counsel for DIRECTV


Document Created: 2012-05-08 09:04:52
Document Modified: 2012-05-08 09:04:52
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