**Exhibit 4.51**

 

**FOIA CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION IN THIS AGREEMENT. THIS INFORMATION HAS BEEN REDACTED AND DENOTED BY ASTERISKS [***].**

 

 

**TWENTY-FOURTH AMENDMENT TO**

**AGREEMENT 319-I**

 

THIS TWENTY-FOURTH AMENDMENT TO AGREEMENT NUMBER 319-I IS ENTERED INTO THIS 8TH DAY OF AUGUST, 2012 (THE “EXECUTION DATE”), BY AND BETWEEN **HUGHES NETWORK SYSTEMS, LLC**, A LIMITED LIABILITY COMPANY ORGANIZED AND EXISTING UNDER THE LAWS OF THE STATE OF DELAWARE WHICH SHALL HEREINAFTER BE REFERED AS THE**“CLIENT”**, SUCCESSOR IN INTEREST TO **HUGHES NETWORK SYSTEMS,** A DIVISION OF **HUGHES ELECTRONICS CORPORATION,** AND AS THE OTHER PARTY **SATELITES MEXICANOS, S.A. DE C.V.**, WHICH SHALL HEREINAFTER BE REFERED AS **“SATMEX”**, A CORPORATION ORGANIZED AND EXISTING UNDER THE LAWS OF MEXICO (TOGETHER REFERRED AS THE “PARTIES”) PURSUANT TO THE FOLLOWING:

 

**W I T N E S S E T H**

 

**WHEREAS**, on January 20, 2000, **SATMEX** and **HUGHES ELECTRONICS CORPORATION**, through the**CLIENT**, executed the agreement number 319-I, hereinafter the “Agreement”;

 

**WHEREAS**, up to the Execution Date, the Parties have executed Twenty Three Amendments to the Agreement in order to modify the terms and conditions of the satellite capacity provided by **SATMEX**to the **CLIENT**.

 

**NOW THEREFORE**, in consideration of the foregoing and mutual covenants contained in this Twenty-Fourth Amendment, the Parties agree as follows:

 

**A G R E E M E N T**

 

**FIRST. **The Parties agree to [***] the satellite capacity of [***] in Satmex 6 satellite, in accordance with the following schedule:

 

a)             From the Execution Date the satellite capacity in transponder [***], considering a monthly fee per MHz of USD$[***]; therefore, the monthly fee for the [***] capacity is the amount of USD$ [***].

 

b)             From [***], the satellite capacity in transponder [***], considering a monthly fee per MHz of USD$[***]; therefore, the monthly fee for the increased capacity is the amount of USD$ [***].

 

Consequently, the total contracted capacity after the [***] considered in this Twenty-Fourth Amendment is [***]**,**with a total monthly payment of **USD$**[***]

 

Therefore, the transponders related to the [***] and [***] are as follow:

 

[***]

 
| ** **    | ** ** | **Band**   | ** ** | ** ** | ** ** | **Bandwith** | ** ** | ** ** |
|---------------|------------|------------|------------|------------|------------|--------------|------------|------------|
| **Satellite** | ** ** | **Region** | ** ** | **Txdr**   | ** ** | **MHz**      | ** ** | **Term**   |
| Satmex 6      |       | [***]      |       | [***]      |       | [***]        |       | [***]      |
| [***]         |       | [***]      |       | [***]      |

 

[***]

 
| ** **    | ** ** | ** ** | ** ** | ** ** | ** ** | **Bandwith** | ** ** | ** ** |
|---------------|------------|------------|------------|------------|------------|--------------|------------|------------|
| **Satellite** | ** ** | **Band**   | ** ** | **Txdr**   | ** ** | **MHz**      | ** ** | **Term**   |
| Satmex 5      | ** ** | [***]      | ** ** | [***]      | ** ** | [***]        | ** ** | [***]      |
| Satmex 6      | ** ** | [***]      | ** ** | [***]      | ** ** | [***]        | ** ** |

 

**SECOND.** The Parties agree that the term of this Twenty-Fourth Amendment commence from the Execution Date and shall terminate in accordance with the terms and conditions set forth in the Seventeenth Amendment.

 

CONFIDENTIAL

 

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**FOIA CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION IN THIS AGREEMENT. THIS INFORMATION HAS BEEN REDACTED AND DENOTED BY ASTERISKS [***].**

 

 

**THIRD.**All notices to be provided under the Amendments and/or the Agreement shall be in accordance with the terms and conditions set forth in the Seventeenth Amendment.

 

**FOURTH****.**This Twenty-Fourth Amendment, the underlying commercial relationship between the Parties, and all collateral matters relating thereto, shall be governed by, and construed in accordance with Section 33 of the Agreement.

 

**FIFTH.**Except as specifically amended hereby, the terms and conditions of the Agreement and its past Amendments, shall remain in full force and effect in accordance with its terms.

 

This Twenty-Fourth Amendment is signed in counterparts, one copy remaining in possession of each Party, as of the Execution Date first written above.

 
| FOR THE**CLIENT**            |       | FOR **SATMEX**                               |
|------------------------------|------------|----------------------------------------------|
| **HUGHES NETWORK SYSTEMS**   |       | **SATÉLITES MEXICANOS, S.A. DE   C.V.** |
| ** **                   | ** ** | ** **                                   |
| ** **                   | ** ** | ** **                                   |
| /s/ Philip K.   O’Brien |       | /s/ Patricio E.   Northland                  |
| **PHILIP K. O’BRIEN**   |       | **PATRICIO E. NORTHLAND**                    |
| **VICE PRESIDENT**           | ** ** | **GENERAL DIRECTOR**                         |

 

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