Attachment EngineeringStatement

This document pretains to SAT-MOD-20160816-00084 for Modification on a Satellite Space Stations filing.

IBFS_SATMOD2016081600084_1146436

Orbital Debris Mitigation Plan
Intelsat is proactive in ensuring safe operation and disposal of this and all spacecraft under its
control. The four elements of debris mitigation are addressed below.

1.1 Spacecraft Hardware Design
Intelsat 902 is designed such that no debris will be released during normal operations. Intelsat
has assessed the probability of collision with meteoroids and other small debris (<1 cm diameter)
and has taken the following steps to limit the effects of such collisions: (1) critical spacecraft
components are located inside the protective body of the spacecraft and properly shielded; and
(2) all spacecraft subsystems have redundant components to ensure no single-point failures. The
spacecraft does not use any subsystems for end-of-life disposal that are not used for normal
operations.

1.2 Minimizing Accidental Explosions
Intelsat has assessed the probability of accidental explosions during and after completion of
mission operations. The spacecraft is designed in a manner to minimize the potential for such
explosions. Propellant tanks and thrusters are isolated using redundant valves and electrical
power systems are shielded in accordance with standard industry practices. At the completion of
the mission and upon disposal of the spacecraft, Intelsat will ensure the removal of all stored
energy on the spacecraft by depleting all propellant tanks, venting all pressurized systems, and
by leaving the batteries in a permanent discharge state.

1.3 Safe Flight Profiles
Intelsat has assessed and limited the probability of the space station becoming a source of debris
as a result of collisions with large debris or other operational space stations. Intelsat 902 will not
be located at an orbital location that has an overlapping station-keeping volume with another
satellite. Intelsat is not aware of any other FCC licensed system, or any other system applied for
and under consideration by the FCC, that will have an overlapping station-keeping volume with
Intelsat 902. Intelsat is also not aware of any system with an overlapping station-keeping volume
with Intelsat 902 that is the subject of an ITU filing and that is either in orbit or progressing
towards launch.
1.4 Post Mission Disposal
At the end of the mission, Intelsat intends to dispose of the spacecraft by moving it to an altitude
of at least 150 kilometers above the geostationary arc. Intelsat has reserved 52.5 kilograms of
fuel for this purpose. In its Second Report and Order in IB Docket 02-54, Mitigation of Orbital
Debris,1 the FCC declared that satellites launched prior to March 18, 2002, such as the Intelsat


1
    Mitigation of Orbital Debris, Second Report and Order, 19 FCC Rcd 11567 (2004).


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902 satellite, would be designated as grandfathered satellites not subject to a specific disposal
altitude. Therefore, the planned disposal orbit for Intelsat 902, complies with the FCC’s rules.

The reserved fuel figure was determined by the spacecraft manufacturer and provided for in the
propellant budget. This figure takes into account the expected mass of the satellite at the end of
life and the required delta-velocity to achieve the desired orbit. The fuel gauging uncertainty has
been taken into account in these calculations.


Certification Statement

I hereby certify that I am a technically qualified person and am familiar with Part 25 of the
Commission’s rules. The contents of this engineering statement were prepared by me or under
my direct supervision and to the best of my knowledge are complete and accurate.



          /s/ Richard O. Evans                                August 16, 2016

          Richard O. Evans                                           Date
               Intelsat
     Senior Principal Regulatory
   Engineer, Spectrum Engineering




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Document Created: 2016-08-16 16:29:53
Document Modified: 2016-08-16 16:29:53

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