Document:

Exhibit 10.6

 Exhibit 10.6 
 PROMISSORY NOTE 
 September 30, 2010 

1. Principal. Iridium Satellite LLC, a Delaware limited liability company (the “Issuer”), hereby promises to pay
to the order of Motorola, Inc., a Delaware corporation (the “Holder”), the principal amount of Twenty-Three Million and 00/100 Dollars ($23,000,000) (the “Original Principal Amount”) ( together with interest thereon
calculated from the date hereof in accordance with the provisions of this instrument (this “Note”). For purposes of this Note, the term “Principal Balance” shall mean an amount equal to (a) the Original
Principal Amount, plus (b) all accrued and unpaid interest that has been added to the outstanding principal balance of this Note in accordance with Section 2, minus (c) all payments of principal made by the Issuer from
time to time pursuant to the terms of this Note. If not paid in full earlier, the entire Principal Balance and all accrued and unpaid interest shall be due and payable in full on December 31, 2011 (the “Maturity Date”).

 2. Payment of Interest. Except as otherwise expressly provided herein, the Principal Balance of this Note shall bear
interest (computed on the basis of actual days elapsed in any year) at a rate of ten percent (10%) per annum. Interest accruing on the Principal Balance of this Note shall be compounded and added to the outstanding principal balance of this
Note on the last day of each calendar month beginning on October 31, 2010. All accrued and unpaid interest on this Note shall be paid upon the payment in full of the entire outstanding Principal Balance of this Note (whether on the Maturity
Date or as a result of the acceleration of the maturity thereof), or if a prepayment of this Note is made, on the Principal Balance prepaid, and, if payment in full is not paid when due, thereafter on demand. Any accrued interest which for any
reason has not theretofore been paid shall be paid in full on the date on which the final principal payment on this Note is made. During the occurrence and continuance of a Default, the rate of interest payable pursuant to this Section 2 shall
be increased by two percent (2%) per annum. 
 3. Payment. All payments to be made to the Holder under this Note
shall be made to the Holder in lawful money of the United States of America either by wire transfer in same-day funds to an account directed by the Holder in writing or by check to the Holder at such address as the Holder may from time to time
direct in writing. 
 4. Prepayment. The Issuer, at its option, may prepay without premium or penalty all or any portion
of the Principal Balance of this Note at any time, plus accrued and unpaid interest through the date of such payment. 
 5.
Security. The Issuer’s obligations under this Note are secured pursuant to the terms of that certain Security Agreement dated as of the date hereof (the “Security Agreement”) executed by the Issuer in favor of Deutsche
Bank Trust Company Americas, not in its individual capacity, but solely as collateral agent for the Holder (the “Collateral Agent”). 
 6. Guaranty. Each of Iridium Holdings LLC, a Delaware limited liability company (“Iridium Holdings”), and Iridium Communications Inc., a Delaware corporation (“Iridium
Communications”; and together with Iridium Holdings, each a “Guarantor”), has entered into that certain Guaranty dated as of the date hereof in favor of the Holder (the “Guaranty”) pursuant to which the
Guarantors have jointly and severally guaranteed the Issuer’s obligations under the Note Documents (as defined below) to which the Issuer is a party. 
 CONFIDENTIAL TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE
VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION. 

 7. Representations and Warranties. To induce the Holder to accept this Note, the
Issuer warrants that: 
 (a) The Issuer is a limited liability company duly organized, validly existing and in
good standing under the laws of the State of Delaware. The Issuer and each of its subsidiaries is in good standing and is duly qualified to do business in each state where, because of the nature of its activities or properties, such qualification is
required, except where failure to be so qualified could not reasonably be expected to materially and adversely affect (1) the financial condition or operations of the Guarantors, the Issuer and their respective Subsidiaries taken as a whole or
(2) the ability of any Guarantor or the Issuer to perform its respective obligations under any Note Document. 
 (b) The Issuer is duly authorized to execute and deliver this Note, the Security Agreement, the Deposit Account Control Agreement (the “Deposit Account Control Agreement”) dated as of the
date hereof among the Issuer, the Collateral Agent and Bank of America, N.A. (the “Depositary Bank”), the Collateral Agency and Priority Agreement (the “Intercreditor Agreement”) dated as of the date hereof among
the Issuer, the Collateral Agent, the Holder and Société Générale, as agent (the “COFACE Agent”) for the COFACE Creditors and each other document from time to time entered into in connection herewith and
therewith (all such documents, together with the Guaranty, the “Note Documents”) to which it is a party, and the Issuer is and will continue to be duly authorized to perform its obligations under this Note and the other Note
Documents. The execution, delivery and performance by the Issuer of the Note Documents to which it is a party do not and will not require any consent or approval of any governmental agency or authority that has not been or will not be promptly
obtained. 
 (c) The execution, delivery and performance by the Issuer of the Note Documents to which it is a
party do not and will not conflict with (a) any provision of law, (b) the charter documents of the Issuer, (c) any agreement binding upon the Issuer or any of its Subsidiaries, or (d) any court or administrative order or decree
applicable to the Issuer or any of its Subsidiaries, and do not and will not require, or result in, the creation or imposition of any Lien on any asset of the Issuer or any of its subsidiaries (other than Liens granted pursuant to the Security
Agreement and Permitted Liens). 
 (d) Each Note Document to which it is a party is a legal, valid and binding
obligation of the Issuer, enforceable against the Issuer in accordance with its terms, except as enforceability may be limited by bankruptcy, insolvency or other similar laws of general application affecting the enforcement of creditors’ rights
or by general principles of equity limiting the availability of equitable remedies. 
 (e) The Issuer is not in
default under any agreement or instrument to which the Issuer is a party or by which any of its properties or assets is bound or affected, which default could reasonably be expected to materially and adversely affect (1) the

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 
financial condition or operations of the Guarantors, the Issuer and their respective Subsidiaries taken as a whole or (2) the ability of any Guarantor or the Issuer to perform its respective
obligations under any Note Document. No Default has occurred and is continuing. 
 (f) No claims, litigation,
arbitration proceedings or governmental proceedings are pending or threatened against or are affecting the Issuer or any of its subsidiaries, the results of which could reasonably be expected to materially and adversely affect (1) the financial
condition or operations of the Guarantors, the Issuer and their respective Subsidiaries taken as a whole or (2) the ability of any Guarantor or the Issuer to perform its respective obligations under any Note Document. Neither the Issuer nor any
of its Subsidiaries has any contingent liabilities which are material to the Issuer and its Subsidiaries taken as a whole. 
 (g) The Issuer and its Subsidiaries are in material compliance with all statutes and governmental rules and regulations applicable to them. 

(h) The Pledged Account (as defined below) maintained at the Depositary Bank is the Issuer’s primary collection
account for Accounts Receivable (as defined below) and is the Issuer’s primary operating account. Not less than 90% of the aggregate dollar amount of all payments received from the Issuer’s customers are deposited into the Pledged Account.

 8. Covenants. So long as any of the obligations of the Issuer under this Note are outstanding and unpaid: 

(a) The Issuer shall not change its name, identity, corporate structure, organizational identification number, if any, or
jurisdiction of organization (within the meaning of Section 9-102 of any applicable enactment of the Code) unless it shall have: (i) given the Holder at least thirty (30) days’ prior written notice thereof and (ii) the
Holder shall have received all financing statements, instruments and other documents reasonably requested by the Holder in connection with such change in order to preserve the perfection and priority of the security interest granted pursuant to the
Security Agreement. 
 (b) The Issuer shall at all times defend its title to the Collateral and the Collateral
Agent’s Liens therein against all Persons, claims and demands whatsoever, other than Permitted Liens. The Issuer shall not, directly or indirectly, create, incur or permit to exist any Lien of any kind on or with respect to all or any portion
of the Collateral other than (i) Liens in favor of the Collateral Agent for the benefit of the Holder and (ii) Permitted Liens. 
 (c) The Issuer shall maintain deposit account number 0039-2131-3284 at the Depositary Bank, which deposit account shall be referred to herein as the “Pledged Account”. The Deposit Account
Control Agreement shall establish the Collateral Agent’s control over and Lien in the Pledged Account. Subject to the terms of the Intercreditor Agreement, the Collateral Agent’s rights under the Deposit Account Control

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 
Agreement may be exercised by the Collateral Agent following the occurrence of any Default, requiring prompt deposit of all remittances received in any lockbox administered by the Depositary Bank
(collectively, the “Lockbox”) to the Pledged Account, and waiving offset rights of such servicer or bank, except for customary charges agreed to by the Holder therein. Following the occurrence of a Default, the Collateral Agent will
apply the proceeds of the Collateral in accordance with the terms of the Intercreditor Agreement. The Holder assumes no responsibility to the Issuer for any lockbox arrangement or the Pledged Account, including any claim of accord and satisfaction
or release with respect to any payment items accepted by any lockbox servicer (if any) or the Depositary Bank. 

(d) The Issuer shall establish and maintain in favor of the Collateral Agent for the benefit of the Holder a valid and
perfected first priority security interest in the Collateral free and clear of any Liens other than (i) Liens in favor of the Collateral Agent for the benefit of the Holder and (ii) Permitted Liens (including, without limitation, by filing
all financing statements or other similar instruments or documents necessary under the Code (or any comparable law) of all appropriate jurisdictions to perfect the Collateral Agent’s interest in the Collateral and taking such other action to
perfect, protect or more fully evidence the interest of the Collateral Agent, as the Holder may reasonably request). 
 (e) The Issuer shall cause (1) all proceeds from the Lockbox to be directly deposited into the Pledged Account and (2) the Lockbox and Pledged Account to be subject at all times to the Deposit
Account Control Agreement that is in full force and effect unless the Collateral Agent acting on behalf of the Intercreditor Parties has terminated such agreement. Except as otherwise set forth in the last sentence of this Section 8(e), in the
event any payments relating to Accounts Receivable are remitted to any account other than the Pledged Account or directly to the Issuer or any affiliate of the Issuer, the Issuer will remit (or will cause all such payments to be remitted) directly
to the Depositary Bank and deposited into the Pledged Account within two (2) business days following receipt thereof, and, at all times prior to such remittance, the Issuer will itself hold or, if applicable, will cause such payments to be held
in trust for the exclusive benefit of the Collateral Agent for the benefit of the Holder. The Issuer will maintain exclusive ownership, dominion and control (subject to the terms of the Note Documents) of the Lockbox and the Pledged Account and
shall not grant the right to take dominion and control of the Lockbox or the Pledged Account at a future time or upon the occurrence of a future event to any Person, except to the Collateral Agent as contemplated by the Note Documents. At all times,
the Issuer shall cause not less than 90% of the aggregate dollar amount of all payments in respect of Accounts Receivable to be made directly to the Pledged Account (or the Lockbox). 

(f) The Issuer shall not close the Pledged Account, terminate or replace the Depositary Bank, or make any change in the
instructions to Account Debtors regarding payments to be made to the Lockbox or the Pledged Account, unless the Holder shall have received, at least ten (10) days before the proposed effective date therefor, (i) written notice of such
closure, termination, replacement or change and (ii) with respect to the closure, termination or replacement of any depositary bank, collection 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 
account or lock-box in respect of any Accounts Receivable, an executed account control agreement (in form and substance satisfactory to the Holder) with respect to such replacement depositary
bank, collection account or lock-box relating to Accounts Receivable. 
 (g) From and after September 1,
2011 to but excluding October 15 2011, the Issuer shall maintain at all times a minimum aggregate balance in the Pledged Account of not less than $10,000,000. From and after October 15, 2011 to but excluding November 30, 2011, the
Issuer shall maintain at all times a minimum aggregate balance in the Pledged Account of not less than $15,000,000. From and after November 30, 2011, the Issuer shall maintain at all times a minimum aggregate balance in the Pledged Account of
not less than one hundred-three percent (103%) of the total outstanding amount of principal and accrued and unpaid interest due on this Note. 
 (h) The Issuer will comply with all laws, rules, regulations and orders of any governmental authority applicable to it or its property except where the failure to so comply could not reasonably be
expected to materially and adversely affect (1) the financial condition or operations of the Guarantors, the Issuer and their respective Subsidiaries taken as a whole or (2) the ability of any Guarantor or the Issuer to perform its
respective obligations under any Note Document. 
 (i) The Issuer will preserve and maintain its existence,
rights, franchises and privileges in the jurisdiction of its formation, and qualify and remain qualified in good standing as a foreign limited liability company in each jurisdiction where its business is conducted, except where the failure to so
preserve and maintain or qualify could not reasonably be expected to materially and adversely affect (1) the financial condition or operations of the Guarantors, the Issuer and their respective Subsidiaries taken as a whole or (2) the
ability of any Guarantor or the Issuer to perform its respective obligations under any Note Document. 
 9. Financial
Reporting Covenants. (a) So long as any of the obligations of the Issuer under this Note are outstanding and unpaid, the Issuer will furnish or cause to be furnished to the Holder at its office: 

(i) within one hundred twenty (120) days after the end of each fiscal year of Iridium Communications, the audited
balance sheet of Iridium Communications as at the end of such year, and the related audited statements of income and retained earnings and related audited statements of cash flows for such year, all of which shall be on a consolidated basis with
Iridium Communications’ subsidiaries, which financial statements (A) shall set forth in comparative form such figures as at the end of and for the previous year, and (B) shall be accompanied by an opinion of independent certified
public accountants of recognized standing reasonably satisfactory to the Holder, stating that such financial statements are prepared without deviation from generally accepted account principles (“GAAP”) (provided that delivery of
Iridium Communications’ Form 10-K containing the information required to be contained therein pursuant to the rules and regulations of the Securities and Exchange Commission, including financial statements reported on by independent public
accountants, shall be deemed to satisfy the 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 
foregoing delivery requirements), together with statement of the Chief Financial Officer of Iridium Communications certifying that all such financial statements present fairly in accordance with
GAAP the financial position, results of operations and statements of cash flows of Iridium Communications and its subsidiaries on a consolidated basis, as at the end of such fiscal year and for the period then ended, and that there was no Default in
existence as of such time or, if a Default has occurred and is continuing, describing the nature thereof and all efforts undertaken to cure such Default; 
 (ii) within forty-five (45) days after the last day of each fiscal quarter in each fiscal year of Iridium Communications, (i) the balance sheet of Iridium Communications as at the end of such
fiscal quarter, and the related statement of income and retained earnings and related statement of cash flows for such fiscal quarter and for the elapsed portion of the year ended with the last day of such fiscal quarter, and (ii) the balance
sheet of Iridium Communications as at the end of such fiscal quarter, and the related statement of income and retained earnings and related statement of cash flows for such fiscal quarter and for the elapsed portion of the year ended with the last
day of such quarter, which financial statements shall set forth in comparative form such figures as at the end of such fiscal quarter during the previous fiscal year and for such fiscal quarter during the previous fiscal year, all of which shall be
on a consolidated with Iridium Communications’ subsidiaries, and in each case shall be certified by an authorized signatory to, in his or her opinion, present fairly in accordance with GAAP the financial position of Iridium Communications, as
at the end of such period and the results of operations for such period, and for the elapsed portion of the fiscal year ended with the last day of such period, subject only to normal year-end adjustments, the absence of footnotes (provided that
delivery of Iridium Communications’ Form 10-Q containing the information required to be contained therein pursuant to the rules and regulations of the Securities and Exchange Commission, including financial statements reported on by independent
public accountants, shall be deemed to satisfy the foregoing delivery requirements), together with statement of the Chief Financial Officer of Iridium Communications certifying that all such financial statements present fairly in accordance with
GAAP the financial position, results of operations and statements of cash flows of Iridium Communications and its subsidiaries on a consolidated basis, as at the end of such fiscal quarter and for the period then ended, and that there was no Default
in existence as of such time or, if a Default has occurred and is continuing, describing the nature thereof and all efforts undertaken to cure such Default; and 
 (iii) as soon as available but in any event within twenty (20) days of the end of each calendar month and at such other times as may be requested by the Holder, as of the period then ended, delivered
electronically in a text formatted file acceptable to the Holder an aging report of the Issuer’s Accounts Receivable in the form of Exhibit A attached hereto; and 

(iv)(a) promptly upon request by the Holder, copies of all account statements received from the Depositary Bank with
respect to the Pledged Account, and (b) commencing with September 1, 2011, copies of daily screen shots of the current balance in the Pledged Account. 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 (b) The Issuer shall notify the Holder in writing of any of the following
promptly upon learning of the occurrence thereof, describing the same and, if applicable, the steps being taken with respect thereto: 
 (i)(A) the entry of any judgment or decree against any Guarantor, the Issuer or any of its subsidiaries if the aggregate amount of all judgments and decrees then outstanding against the Guarantors, the
Issuer and its subsidiaries exceeds $5,000,000 (after deducting the amount with respect to which any such Guarantor, the Issuer or any such subsidiary is insured and with respect to which the insurer has not denied responsibility) and (B) the
institution of any litigation, arbitration proceeding or governmental proceeding against any Guarantor, the Issuer or any of its subsidiaries which, individually or in the aggregate, could reasonably be expected to materially and adversely affect
(1) the financial condition or operations of any Guarantor, the Issuer and their respective Subsidiaries taken as a whole or (2) the ability of any Guarantor or the Issuer to perform its respective obligations under any Note Document;

 (ii) the occurrence of any event or condition that has had or could reasonably be expected to have a material
adverse affect on (1) the financial condition or operations of the Guarantors, the Issuer and their respective Subsidiaries taken as a whole or (2) the ability of the Guarantors or the Issuer to perform their obligations under any Note
Document; 
 (iii) the occurrence of a default or an event of default under any Indebtedness pursuant to which
any Guarantor or the Issuer is a debtor or an obligor, the aggregate outstanding principal amount of which exceeds $1,000,000. 

10. Default. If one or more of the following events shall occur and be continuing (each, a “Default”):

 (a) the Issuer defaults in the payment of any principal or interest on this Note when the same becomes due and
payable; or 
 (b) any representation, warranty or other written statement of any Guarantor or the Issuer made in
connection with any Note Documents or transactions contemplated thereby is incorrect or misleading in any material respect when given; or 
 (c) any Guarantor or the Issuer breaches or fails to perform any covenant contained in this Note or any other Note Document to which it is party (other than those specified in clause (a) above) and
such breach or failure continues for a period of ten (10) business days after (i) the Issuer knew or should have known of such breach or failure or (ii) receipt by the Issuer of written notice from the Holder of such breach or
failure; provided, however, that such opportunity to cure shall not apply if the breach or failure to perform is not capable of being cured within such ten-day period or is a willful breach by such Guarantor or the Issuer; or

 (d) any breach or default of any Guarantor or the Issuer occurs under any document, instrument or agreement to
which it is a party or by which it or any of its properties is bound, relating to any Indebtedness (other than the Indebtedness evidenced by this Note) in excess of $1,000,000; 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 (f) any judgment or order for the payment of money is entered against any
Guarantor or the Issuer in an amount that exceeds, individually or cumulatively with all unsatisfied judgments or orders against the Guarantors and the Issuer, $5,000,000 (net of any insurance coverage therefor acknowledged in writing by the
insurer), and such Guarantor or the Issuer, as applicable, shall not discharge the same in accordance with its terms, or procure a stay of execution thereof, within thirty (30) days after the date of entry thereof and, within said period of
thirty (30) days, or such longer period during which the execution of such judgment shall have been stayed, appeal therefrom and cause the execution thereof to be stayed during such appeal; or 

(g) an involuntary proceeding shall be commenced or an involuntary petition shall be filed seeking (i) liquidation,
reorganization or other relief in respect of any Guarantor or the Issuer or its debts, or of a substantial part of its assets, under any Federal, state or foreign bankruptcy, insolvency, receivership or similar law now or hereafter in effect or
(ii) the appointment of a receiver, trustee, custodian, sequestrator, conservator or similar official for any Guarantor or the Issuer or for a substantial part of its assets, and, in any such case, such proceeding or petition shall continue
undismissed for thirty (30) days or an order or decree approving or ordering any of the foregoing shall be entered; or 
 (h) any Guarantor or the Issuer shall (i) voluntarily commence any proceeding or file any petition seeking liquidation, reorganization or other relief under any Federal, state or foreign bankruptcy,
insolvency, receivership or similar law now or hereafter in effect, (ii) consent to the institution of, or fail to contest in a timely and appropriate manner, any proceeding or petition described in clause (h) of this Section,
(iii) apply for or consent to the appointment of a receiver, trustee, custodian, sequestrator, conservator or similar official for such Guarantor or the Issuer or for a substantial part of its assets, (iv) file an answer admitting the
material allegations of a petition filed against it in any such proceeding, (v) make a general assignment for the benefit of creditors or (vi) take any action for the purpose of effecting any of the foregoing; if a decree or order of a
court having jurisdiction in the premises for the appointment of a receiver or liquidator or trustee or assignee in bankruptcy or insolvency of such Guarantor or the Issuer, or for the winding up or liquidation of its affairs, shall have been
entered, and such decree or order shall have remained in force undischarged and unstayed for a period of thirty (30) days; or 
 (i)(a) any person or group of persons (within the meaning of the Securities Exchange Act of 1934) shall have acquired beneficial ownership (within the meaning of Rule 13d-3 promulgated by the
Securities and Exchange Commission under the Securities Exchange Act of 1934) of thirty-five percent (35%) or more of the issued and outstanding shares of capital stock of Iridium Communications having the right to vote for the election of
directors of Iridium Communications under ordinary circumstances; (b) during any period of twelve consecutive calendar months, individuals 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 
who at the beginning of such period constituted the board of directors of Iridium Communications (together with any new directors whose election by the board of directors of Iridium
Communications or whose nomination for election by the stockholders of Iridium Communications was approved by a vote of at least two-thirds of the directors then still in office who either were directors at the beginning of such period or whose
election or nomination for election was previously so approved) cease for any reason other than death or disability to constitute a majority of the directors then in office; or (c) Iridium Communications ceases to own and control, directly or
indirectly, all of the economic and voting rights associated with all of the outstanding capital stock of the Issuer. 
 then, and in each such
case, the Holder by notice to the Issuer and at any time and from time to time, may (i) declare all or part of the principal of and interest on this Note immediately payable, and thereupon the same shall become immediately payable,
(ii) exercise and enforce, or cause the Collateral Agent to exercise and enforce, any and all rights and remedies available upon default to a secured party under the Code, including the right to take possession of the Collateral, or any
evidence thereof, proceeding without judicial process or by judicial process (without a prior hearing or notice thereof, which the Issuer hereby expressly waives) and the right to sell, lease or otherwise dispose of any or all of the Collateral
(with or without giving any warranties as to the Collateral, title to the Collateral or similar warranties), and, in connection therewith, the Issuer will on demand assemble the Collateral and make it available to the Collateral Agent at a place to
be designated by the Collateral Agent acting on behalf of the Holder and (iii) exercise any other rights and remedies available to it by law or agreement. Notwithstanding the foregoing, the Collateral Agent’s exercise of any of its rights
and remedies against the Collateral shall be subject to the terms of the Intercreditor Agreement. 
 11. Payment of Legal
Fees and Expenses. The Issuer shall pay all fees, costs and expenses (including the reasonable fees and expenses of its counsel) incurred by the Holder or the Collateral Agent in connection with the negotiation, preparation and filing and/or
recordation of the Note Documents and incurred in connection with (i) any amendment, modification or waiver of, or consent with respect to, or termination of, any of the Note Documents and (ii) any attempt to enforce any remedies of the
Holder or the Collateral Agent against the Issuer or any Guarantor, including, as to each of clauses (i) and (i) above, all reasonable attorneys’ and other professional and service providers’ fees arising from such services and
other advice, assistance or other representation, including those in connection with any appellate proceedings, and all expenses, costs, charges and other fees incurred by such counsel and others in connection with or relating to any of the events
or actions described in this Section 11. 
 12. Confession of Judgment. Upon execution of this Note, and as
additional security for the Issuer paying the entire Principal Balance and all accrued and unpaid interest, the Issuer shall tender to the Holder a fully executed and notarized Confession of Judgment and Power of Attorney (the “Confession of
Judgment”) for whatever amount of the Principal Balance and accrued and unpaid interest has not been paid by the close of business on December 31, 2011, in a form that is identical to the document attached hereto as Exhibit B, which is
herein incorporated by reference. As set forth in Exhibit B, in the event that the Issuer fails to pay the Principal Balance and all accrued and unpaid interest in accordance with the terms of this Note,

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 
the Issuer hereby authorizes and empowers the Clerk of the Cook County Circuit Court to enter a confession of judgment against the Issuer, in favor of the Holder, for all amounts outstanding and
owing by the Issuer to the Holder under this Note, which amounts include, without limitation, the Principal Balance, plus all accrued and unpaid interest, plus the reasonable costs of suit and attorneys’ fees for entering and enforcing that
judgment. For purposes of this Note and/or any Confession of Judgment, the Issuer represents that the Note was executed in Cook County, Illinois. In the event that the Issuer pays the Principal Balance, plus all accrued and unpaid
interest, plus the reasonable costs of suit and attorneys’ fees in accordance with the terms of this Note, the Holder shall return the original Confession of Judgment within five (5) business days after receipt of such payments to the
Issuer. In the event that the Issuer fails to pay the Principal Balance and all accrued and unpaid interest by the close of business on December 31, 2011, the Holder may sue to enforce without contest the Confession of Judgment. 

13. Miscellaneous. 
 (a) The provisions under this Note shall (i) be binding upon the Issuer and its respective successors and assigns and (ii) inure to the benefit of the Holder and its respective successor and
assigns. The Issuer may not transfer any of its rights or obligations hereunder without the prior written consent of the Holder (and any attempted assignment or transfer by the Issuer without such consent shall be null and void). This Note and the
Holder’s rights hereunder and interest herein shall be assignable by the Holder and its successors and assigns without the consent of the Issuer; provided that the Holder and its successors and assigns shall not assign any of its rights and
obligations under this Note to any Person listed on Schedule I attached hereto without the prior written consent of the Issuer (which consent shall not be unreasonably withheld or delayed). 

(b) If any provision hereof shall be held invalid or unenforceable by any court of competent jurisdiction or as a result
of future legislative action, such holding or action shall be strictly construed and shall not affect the validity or effect of any other provision hereof. 
 (c) This Note shall be governed by and construed in accordance with the laws of the State of Illinois, without regard to or application of conflict of law rules or principles. Any dispute or claim arising
out of or in connection with this Note shall be adjudicated in a State or Federal Court located in Cook County, Illinois and each of the Holder (by its acceptance hereof) and the Issuer irrevocably consents to the exclusive jurisdiction and venue of
any such court. 
 (d) No amendment, modification, or termination or waiver of any provision of this Note shall
be effective unless the same shall be in writing and signed by the Issuer and the Holder. Each amendment, modification, termination or waiver of this Note shall be effective only in the specific instance and for the specific purpose for which it was
given. 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 (e) All notices, requests, demands and other communications under this Note
shall be in writing and delivered in person or sent by courier service or certified mail, postage prepaid, and properly addressed as follows: 
 to the Holder: 
 Motorola, Inc. 

1303 East Algonquin Road 
 Schaumburg, Illinois 60196 
 Attn: General Counsel 

with copies (which copies shall not constitute notice hereunder) to: 

Winston & Strawn LLP 
 35 W. Wacker Drive 
 Chicago, Illinois 60601 

Attn: Oscar A. David 
   Jai S. Khanna 
 to the Issuer: 

Iridium Satellite LLC 
 1750 Tysons Boulevard 
 Suite 1400 

McLean, Virginia 22102 
 Attn: John Brunette, General Counsel 
 with copies (which copies shall not
constitute notice hereunder) to: 
 Sidley Austin LLP 
 1 South Dearborn Street 
 Chicago, Illinois 60603 

Attn: Jeffrey S. Rothstein 

All notices and other communications required or permitted under this Note which are addressed as provided in this Section 13(e), if delivered
personally or by courier service, shall be effective upon delivery, and, if delivered by certified mail, shall be effective three (3) days after deposit in the United States mail, postage prepaid. Any party may from time to time change its
address for the purposes of notices to that party by a similar notice specifying a new address, but no such change shall be deemed to have been given until it is actually received by the party sought to be charged with the contents thereof.

 14. Definitions; Rules of Interpretation. (a) In addition to the terms defined elsewhere in this Note, the
following terms shall have the following meanings indicated for purposes of this Note (such meanings to be equally applicable to both the singular and the plural forms of the terms defined): 

“Accounts Receivable” means all accounts (as such term is defined in the Code), including, without limitation,
all rights to payment created by or arising from the sale of goods, lease of goods or the rendition of services no matter how evidenced whether or not earned by performance. 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 “Code” has the meaning set forth in the Security Agreement. 

“COFACE Creditors” has the meaning set forth in the Intercreditor Agreement. 

“Collateral” has the meaning set forth in the Security Agreement. 

“Indebtedness” of any Person as of any date means (a) all indebtedness of such Person for borrowed money or
for the deferred purchase price of property or services (other than trade liabilities incurred in the ordinary course of business and payable in accordance with customary practices), (b) any other indebtedness of such Person which is evidenced
by a note, bond, debenture or similar instrument, (c) all obligations of such Person under any leases of property that are required by GAAP to be capitalized on the balance sheet of such Person, (d) all obligations of such Person in
respect of bankers’ acceptances issued or created for the account of such Person, (e) all obligations of such Person in respect of interest rate protection agreements, interest rate futures, interest rate options, interest rate caps and
any other interest rate hedge arrangements, (f) all preferred stock issued by such Person which, pursuant to its terms, is subject to mandatory redemption, retirement or acquisition by such Person on or prior to the Maturity Date and
(g) all indebtedness or obligations of the types referred to in the preceding clauses (a) through (f) secured by any Lien on any property owned by such Person even though such Person has not assumed or otherwise become liable for the
payment thereof. 
 “Intercreditor Parties” shall mean the Holder and the COFACE Creditors. 

“Lien” has the meaning set forth in the Security Agreement. 

“Permitted Liens” means”: 
 (i) Liens in favor of the Collateral Agent for the benefit of the COFACE Creditors which Liens shall be junior and subordinate to the Liens of the Collateral Agent for the benefit of the Holder as set
forth in the Intercreditor Agreement; 
 (ii) rights of the Depositary Bank under the Deposit Account Control
Agreement; 
 (iii) Liens imposed by law for taxes that are not yet due or are being contested in good faith by
appropriate proceedings, provided that (A) adequate reserves with respect to such contested taxes are maintained on the books of the Issuer in accordance with GAAP; (B) such contest is maintained and prosecuted continuously and with
diligence and operates to suspend collection or enforcement of such taxes; (C) none of the Collateral becomes subject to forfeiture or loss as a result of such contest; (D) the Issuer promptly pays or discharges such contested taxes and
all additional charges, interest, penalties and expenses, if any, and delivers to the Holder evidence reasonably acceptable to the 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 
Holder of such compliance, payment or discharge, if such contest is terminated or discontinued adversely to the Issuer or the conditions set forth in this clause (iii) are no longer met; and
(E) the Holder has not advised the Issuer in writing that the Holder reasonably believes that nonpayment or nondischarge of such contested taxes could reasonably be expected to materially and adversely affect (1) the financial condition or
operations of the Guarantors, the Issuer and their respective Subsidiaries taken as a whole or (2) the ability of any Guarantor or the Issuer to perform its respective obligations under any Note Document; and 

(iv) Liens in respect of judgments that do not constitute a Default under clause (f) of Section 10. 

“Person” has the meaning set forth in the Security Agreement. 

“Subsidiary” means, with respect to any Person, a corporation, partnership, limited liability company or other
entity of which shares of stock or other ownership interests having ordinary voting power (other than stock or such other ownership interests having such power only by reason of the happening of a contingency) to elect a majority of the board of
directors or other managers of such corporation, partnership, limited liability company or other entity are at the time owned, or the management of which is otherwise controlled, directly or indirectly through one or more intermediaries, or both, by
such Person. 
 (b) Whenever the context requires, the gender of all words used in this Note includes the masculine, feminine and neuter, and
the singular includes the plural and vice-versa. All references to Sections refer to sections of this Note, and all references to Exhibits are to exhibits attached to this Note, each of which is made a part of this Note for all purposes. The term
“including” means “including, without limitation.” Any accounting term not otherwise defined has the meaning assigned to it in accordance with GAAP. Any reference to a Person shall be deemed to include such Person’s
successors and permitted assigns. 
 [signature page follows] 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 IN WITNESS WHEREOF, the Issuer has caused this Note to be executed and delivered by a duly
authorized officer as of the date first written above. 
  

	
	IRIDIUM SATELLITE LLC
	
	By: /s/ John S. Brunette
	Name: John S. Brunette
	Title: Chief Legal and Administrative Officer

 [Signature page to Promissory Note] 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 SCHEDULE I 
 Each of the following entities, together with their respective affiliates: 
  

	 	•	 	 [***] 

  

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	 	•	 	 [***] 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 EXHIBIT A 
 Form of Aging Report 
 See attached. 

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 

 

 EXHIBIT B 
 CONFESSION OF JUDGMENT AND POWER OF ATTORNEY 
 Iridium Satellite
LLC, (the “Issuer”), by its authorized agent, does hereby irrevocably consent to this Confession of Judgment and Power of Attorney (the “Confession of Judgment”) as follows: 

1. The Issuer confesses and authorizes the entry of an Order of Judgment in favor of Motorola, Inc. (the “Holder”) against the
Issuer for all amounts outstanding and owing by the Issuer to the Holder under the Promissory Note (the “Note”) issued by the Issuer to the Holder on September 30, 2010, which amounts include, without limitation, the Principal Balance
(as defined in the Note), plus all accrued and unpaid interest, plus the reasonable costs of suit and attorneys’ fees (all such amounts are collectively referred to herein as the “Total Sum Due”). 

2. This Confession of Judgment is to be held in escrow by the Holder’s counsel unless the Issuer defaults on paying the Principal
Balance of the Notes and accrued and unpaid interest thereon. If, after written notice of default of the Note, the Issuer fails to pay (or cause to be paid) the Principal Balance of the Note and all accrued and unpaid interest thereon, the Holder is
then authorized to immediately ask the Court to enter an Order of Judgment as described in paragraph 1 above. 
 3. This
Confession of Judgment is for a debt justly due, and arises from the following facts. The Holder and the Issuer entered into a settlement agreement on or around September 30, 2010, pursuant to which the Holder agreed to dismiss its claims in a
lawsuit in the Circuit Court of Cook County – Chancery Division. In the settlement agreement, the Issuer agreed, inter alia, to pay the Holder a total of $46,000,000, such payment consisting of a one-time payment of $23,000,000 to be
paid on the effective date of the settlement agreement, with the remaining $23,000,000 to be paid pursuant to the terms of the Note, which is attached to the settlement agreement as Exhibit D. Pursuant to the terms of the Note, to which this
Confession of Judgment is attached as Exhibit B, the Issuer further agreed that if any amount of the Principal Balance and accrued and unpaid interest remained unpaid by December 31, 2011, the Holder could execute on this Confession of Judgment
for the Total Sum Due. The Issuer’s obligations under the Note also are secured pursuant to the terms of a Security Agreement, dated September 30, 2010, executed by the Issuer in favor of the Collateral Agent for the benefit of the Holder.

 4. This Confession of Judgment is for the purpose of securing the Holder against the contingency that the Issuer may fail to
pay the Total Sum Due. However, the Holder and the Issuer agree that nothing in this Confession of Judgment prevents the Holder from first seeking to enforce the terms of the Note and Security Agreement. 

5. In furtherance of this Confession of Judgment, the Issuer hereby authorizes, makes and constitutes the Holder or any of its attorneys
to act as its true and lawful attorney in fact, and solely with regard to obligations arising out of this Confession of Judgment, in the Issuer’s name, place, and stead to: (a) appear on the Issuer’s behalf in the Circuit Court of
Cook County, which the Issuer agrees has exclusive jurisdiction over the Confession of Judgment; (b) waive a jury trial or any other trial or any other right which the Issuer may have; (c) waive

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 
service of process and confess judgment against the Issuer with written notice and in favor of the Holder for the Total Sum Due; (d) consent to an immediate entry of judgment and the
issuance of an execution thereon; and (e) waive all rights or errors that may intervene in the entering of the judgment or the issuing of the enforcement of the judgment. The power of attorney granted in this Confession of Judgment is expressly
limited to those actions enumerated in this paragraph. The Issuer further agrees that it waives its right to appeal from the judgment. 
 6. Within five (5) business days after receipt of the Total Sum Due, the Holder shall return this Confession of Judgment to the Issuer’s attorneys at Sidley Austin LLP, 1 South Dearborn Street,
Chicago, Illinois 60603. 
 IN WITNESS WHEREOF, an authorized agent of the Issuer hereto has executed and caused to be
notarized this Confession of Judgment on this      day of September, 2010. 
  

			
	IRIDIUM SATELLITE LLC
		
	By:	 	
 

			
	Name:	 	John S. Brunette

			
	Title:	 	Chief Legal and Administrative Officer

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION. 

 NOTARY PUBLIC CERTIFICATE 
 On this      day of September, 2010, John S. Brunette, who is personally known to me appeared before me in his/her capacity as the Chief Legal and Administrative Office of
Iridium Satellite LLC (“Issuer”) and executed on behalf of Issuer the Confession of Judgment and Power of Attorney in favor of Motorola, Inc. to which this Certificate is attached. 

 

	
	  

	Notary Public

  
 CONFIDENTIAL
TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS EXHIBIT. THE COPY FILED HEREWITH OMITS THE INFORMATION SUBJECT TO A CONFIDENTIALITY REQUEST. OMISSIONS ARE DESIGNATED [***]. A COMPLETE VERSION OF THIS EXHIBIT HAS BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION.Exhibit 10.8

 Exhibit 10.8 
 Execution Version 
 GUARANTY 

GUARANTY dated as of September 30, 2010 (this “Guaranty”) made by Iridium Holdings LLC, a Delaware limited
liability company (“Iridium Holdings”), and Iridium Communications Inc., a Delaware corporation (“Iridium Communications”, and together with Holdings, the “Guarantors”), in favor of Motorola, Inc., a Delaware
corporation (“Holder”). 
 WITNESSETH: 
 WHEREAS, Holder, Iridium Satellite LLC, a Delaware limited liability company (“Issuer”), and the other parties thereto are entering into that certain Settlement Agreement and Mutual
Release dated as of the date hereof (including all exhibits thereto, as from time to time amended, restated, supplemented or otherwise modified, the “Settlement Agreement”); 

WHEREAS, in connection with the Settlement Agreement, Issuer is executing in favor of Holder that certain Promissory Note dated as
of the date hereof (as from time to time amended, restated, supplemented or otherwise modified, the “Promissory Note”), and Issuer is executing in favor of Deutsche Bank Trust Company Americas, as collateral agent for the benefit of
Holder, that certain Security Agreement dated as of the date hereof (as from time to time amended, restated, supplemented or otherwise modified, the “Security Agreement”); and 

WHEREAS, in order to induce Holder to enter into the Settlement Agreement and to accept the Promissory Note, the Guarantors have
agreed to execute and deliver this Guaranty whereby each Guarantor shall guarantee the payment when due of all Liabilities (as defined below) and the performance by the Issuer of its obligations under the Promissory Note. 

NOW THEREFORE, in order to induce Holder to enter into the Settlement Agreement and to accept the Promissory Note, each Guarantor
agrees as follows: 
 Section 1. Guaranty of Payment. Each Guarantor jointly and severally unconditionally
and irrevocably guarantees to Holder the punctual payment and performance of all obligations of the Issuer under the Promissory Note, the Security Agreement and any other Note Document (as defined in the Promissory Note) (collectively, the
“Liabilities”). The Liabilities include, without limitation, interest accruing after the commencement of a proceeding under bankruptcy, insolvency or similar laws of any jurisdiction at the rate or rates provided in the Promissory Note.
Upon the failure by Issuer to pay or perform punctually any Liability, each Guarantor agrees that it shall forthwith pay to Holder the amount not so paid at the place and in the manner specified in the Promissory Note or perform the obligations of
the Issuer under the Note Documents. This Guaranty is a guarantee of payment and performance and not of collection only. Holder shall not be required to exhaust any right or remedy or take any action against Issuer or any other person or entity or
any collateral. Each Guarantor agrees that, as between each Guarantor and Holder, the Liabilities may be declared to be due and payable for the purposes of this Guaranty notwithstanding any stay, injunction or other prohibition which may prevent,
delay or vitiate any declaration as regards Issuer and that in the event of a declaration or attempted declaration, the Liabilities shall immediately become due and payable by the Guarantors for the purposes of this Guaranty. 

 Section 2. Guaranty Absolute. Each Guarantor guarantees jointly and
severally that the Liabilities shall be paid or performed strictly in accordance with the terms of the Note Documents. The liability of each Guarantor under this Guaranty is absolute and unconditional irrespective of: (a) any change in the
time, manner or place of payment of, or in any other term of, the Note Documents or Liabilities, or any other amendment or waiver of or any consent to departure from any of the terms of the Note Documents or Liabilities, including any increase or
decrease in the rate of interest thereon; (b) any release or amendment or waiver of, or consent to departure from, any other guarantee or support document, or any exchange, release or non perfection of any collateral, for the Note Documents or
Liabilities; (c) any present or future law, regulation or order of any jurisdiction (whether of right or in fact) or of any agency thereof purporting to reduce, amend, restructure or otherwise affect any term of the Promissory Note or
Liability; (d) without being limited by the foregoing, any lack of validity or enforceability of the Note Documents or Liabilities; and (e) any other setoff, defense or counterclaim whatsoever (in any case, whether based on contract, tort
or any other theory) with respect to the Note Documents or the transactions contemplated thereby which might constitute a legal or equitable defense available to, or discharge of, Issuer or any Guarantor. 

Section 3. Guaranty Irrevocable. This Guaranty is a continuing guarantee of the payment and performance of all
Liabilities now or hereafter existing under the Note Documents and shall remain in full force and effect until payment in full of all Liabilities and other amounts payable under this Guaranty and until the Promissory Note is no longer in effect.

 Section 4. Reinstatement. This Guaranty shall continue to be effective or be reinstated, as the case may
be, if at any time any payment of any of the Liabilities is rescinded or must otherwise be returned by Holder on the insolvency, bankruptcy or reorganization of Issuer or otherwise, all as though the payment had not been made. 

Section 5. Subrogation. Each Guarantor shall not exercise any rights which it may acquire by way of subrogation, by
any payment made under this Guaranty or otherwise, until all the Liabilities have been paid in full and the Promissory Note is no longer in effect. If any amount is paid to any Guarantor on account of subrogation rights under this Guaranty at any
time when all the Liabilities have not been paid in full, the amount shall be held in trust by such Guarantor for the benefit of Holder and shall be promptly paid to Holder to be credited and applied to the Liabilities, whether matured or unmatured
or absolute or contingent, in accordance with the terms hereof and of the Promissory Note. If any Guarantor makes payment to Holder of all or any part of the Liabilities and all the Liabilities are paid in full and the Promissory Note is no longer
in effect, Holder shall, at such Guarantor’s request, execute and deliver to such Guarantor appropriate documents, without recourse and without representation or warranty, necessary to evidence the transfer by subrogation to such Guarantor of
an interest in the Liabilities resulting from the payment. 
 Section 6. Subordination. Without limiting
Holder’s rights under any other agreement, any liabilities owed by Issuer to the Guarantors in connection with any extension of credit or financial accommodation by the Guarantors to or for the account of Issuer, including but not limited to
interest accruing at the agreed contract rate after the commencement of a bankruptcy or similar proceeding, are hereby subordinated to the Liabilities. Upon the occurrence and during the continuation of any Default under the Promissory Note, the
liabilities 

  
 2 

 
of Issuer to the Guarantors shall be collected, enforced and received by the Guarantors as trustee for Holder and shall be paid over to Holder on account of the Liabilities but without reducing
or affecting in any manner the liability of the Guarantors under the other provisions of this Guaranty. 
 Section 7.
Payments Generally. All payments by the Guarantors hereunder shall be made in the manner, at the place and in the currency required by the Promissory Note. 
 Section 8. Certain Taxes. Each Guarantor further agrees that all payments to be made hereunder shall be made without setoff or counterclaim and free and clear of, and without deduction
for, any taxes, levies, imposts, duties, charges, fees, deductions, withholdings or restrictions or conditions of any nature whatsoever now or hereafter imposed, levied, collected, withheld or assessed by any country or by any political subdivision
or taxing authority thereof or therein (“Taxes”). If any Taxes are required to be withheld from any amounts payable to Holder hereunder, the amounts so payable to Holder shall be increased to the extent necessary to yield to Holder (after
payment of all Taxes) the amounts payable hereunder in the full amounts so to be paid. Whenever any such Tax is withheld and paid by any Guarantor, as promptly as possible thereafter, such Guarantor shall send Holder an official receipt (if
available) showing payment thereof, together with such additional documentary evidence as may be reasonably required from time to time by Holder. 
 Section 9. Representations and Warranties. Each Guarantor represents and warrants that: (a) the execution, delivery and performance of this Guaranty by such Guarantor (i) are
within such Guarantor’s corporate or other organizational powers and have been duly authorized by all necessary corporate or limited liability company and, if required, stockholder or similar action on the part of such Guarantor; (ii) will
not violate any material agreement, material instrument, law, regulation or order applicable to such Guarantor; and (iii) do not require the consent or approval of any person or entity, including but not limited to any governmental authority,
or any filing or registration of any kind except such as have been obtained or made and which are in full force and effect; (b) this Guaranty has been duly executed and delivered by such Guarantor and is the legal, valid and binding obligation
of such Guarantor enforceable against such Guarantor in accordance with its terms, except to the extent that enforcement may be limited by applicable bankruptcy, insolvency and other similar laws affecting creditors’ rights generally or by
general principles of equity; and (c) in executing and delivering this Guaranty, such Guarantor has (i) without reliance on Holder or any information received from Holder and based upon such documents and information it deems appropriate,
made an independent investigation of the transactions contemplated hereby and Issuer, Issuer’s business, assets, operations, prospects and condition, financial or otherwise, and any circumstances which may bear upon such transactions, Issuer or
the obligations and risks undertaken herein with respect to the Liabilities; (ii) adequate means to obtain from Issuer on a continuing basis information concerning Issuer; (iii) has reviewed copies of the Promissory Note and the other Note
Documents; and (iv) not relied and will not rely upon any representations or warranties of Holder not embodied herein or any acts heretofore or hereafter taken by Holder (including but not limited to any review by Holder of the affairs of
Issuer). Each Guarantor agrees that the foregoing representations and warranties shall be deemed to have been made by such Guarantor on the date of this Guaranty. 

  
 3 

 Section 10. Remedies Generally. The remedies provided in this Guaranty
are cumulative and not exclusive of any remedies provided by law. 
 Section 11. Setoff. Each Guarantor
agrees that, in addition to (and without limitation of) any right of setoff, banker’s lien or counterclaim Holder may otherwise have, Holder shall be entitled, at its option, to offset balances (general or special, time or demand, provisional
or final) held by it for the account of such Guarantor at its offices, in lawful money of the United States of America or in any other currency, against any amount payable by such Guarantor under this Guaranty which is not paid when due (regardless
of whether such balances are then due to such Guarantor), in which case it shall promptly notify such Guarantor thereof; provided that Holder’s failure to give such notice shall not affect the validity thereof. 

Section 12. Formalities. Each Guarantor waives presentment, notice of dishonor, protest, notice of acceptance of this
Guaranty or incurrence of any Liability and any other formality with respect to any of the Liabilities or this Guaranty. 

Section 13. Amendments and Waivers. No amendment of any provision of this Guaranty shall be effective unless it is in
writing and signed by Holder and each Guarantor. No waiver of any provision of this Guaranty, nor consent to any departure by any Guarantor therefrom, shall be effective unless it is in writing and signed by Holder, and then the waiver or consent
shall be effective only in the specific instance and for the specific purpose for which given. No failure on the part of Holder to exercise, and no delay in exercising, any right under this Guaranty shall operate as a waiver or preclude any other or
further exercise thereof or the exercise of any other right. 
 Section 14. Expenses. Each Guarantor shall
reimburse Holder on demand for all costs, expenses and charges (including without limitation fees and charges of external legal counsel and costs allocated by internal legal counsel) incurred by Holder in connection with the enforcement of this
Guaranty. The obligations of each Guarantor under this Section shall survive the termination of this Guaranty. 

Section 15. Assignment. This Guaranty shall be binding on, and shall inure to the benefit of, each Guarantor, Holder
and their respective successors and assigns; provided that no Guarantor may assign or transfer its rights or obligations under this Guaranty. Without limiting the generality of the foregoing, Holder may assign, sell participations in or otherwise
transfer its rights under the Promissory Note in accordance with the terms thereof to any other person or entity, and the other person or entity shall then become vested with all the rights granted to Holder in this Guaranty or otherwise.

 Section 16. Captions. The headings and captions in this Guaranty are for convenience only and shall not
affect the interpretation or construction of this Guaranty. 
 Section 17. Governing Law, Etc. This Guaranty
shall be governed by and construed in accordance with the laws of the State of Illinois, without regard to or application of conflict of law rules or principles. Any dispute or claim arising out of or in connection with this Guaranty shall be
adjudicated in a State or Federal Court located in Cook County, Illinois and each of Holder (by its acceptance hereof) and Issuer irrevocably consents to the exclusive jurisdiction and venue of any such court. 

  
 4 

 Section 18. Integration; Effectiveness. This Guaranty alone sets forth
the entire understanding of the Guarantors and Holder relating to the guarantee of the Liabilities and constitutes the entire contract between the parties relating to the subject matter hereof and supersedes any and all previous agreements and
understandings, oral or written, relating to the subject matter hereof. This Guaranty shall become effective when it shall have been executed and delivered by each Guarantor to Holder. Delivery of an executed signature page of this Guaranty by
telecopy shall be effective as delivery of a manually executed signature page of this Guaranty. 
 Section 19.
Counterparts. This Guaranty may be executed in any number of separate counterparts, each of which shall collectively and separately constitute one agreement. 
 Section 20. Notices. All communications and notices hereunder shall be in writing and given as provided in Section 13(e) of the Promissory Note. 

Section 21. Definitions. Capitalized terms used but not defined in this Guaranty shall have the meanings set forth in
the Promissory Note or the Security Agreement, as applicable. 
 [signature page follows] 

  
 5 

 IN WITNESS WHEREOF, the Guarantors have caused this Guaranty to be duly executed and
delivered by their authorized officer as of the date first above written. 
  

			
	IRIDIUM HOLDINGS LLC
		
	By:	 	 /s/ John S. Brunette

	Name:	 	John S. Brunette
	Title:	 	Chief Legal and Administrative Officer
	
	IRIDIUM COMMUNICATIONS INC.
		
	By:	 	 /s/ John S. Brunette

	Name:	 	John S. Brunette
	Title:	 	Chief Legal and Administrative Officer

[Signature Page to Guaranty]

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