Document:

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                                                                    EXHIBIT 10.1
                                THIRD AMENDMENT
                               TO LOAN AGREEMENT

     THIS THIRD AMENDMENT to LOAN AGREEMENT is entered into as of the 21/st/ day
of September, 2001, by and between ADVANCED ELECTRONIC SUPPORT PRODUCTS, INC., a
Florida corporation (the "Borrower") and COMMERCEBANK, N.A., (the "Bank").

                                   RECITALS:

A.   Borrower and Bank entered into that certain loan agreement (the "Loan
     Agreement") dated September 23, 1999 under the terms of which Bank agreed
     to lend Borrower $3,500,000.

B.   Borrower and Bank executed and delivered that certain First Amendment to
     Loan Agreement (the "First Amendment") dated September 2, 2000 between
     them.  In connection with the First Amendment, Borrower executed and
     delivered to Bank  that certain Renewal Promissory Note dated September 2,
     2000 (the "Renewal Note") in the original principal amount of $3,500,000.

C.   Borrower and Bank executed and delivered that certain Second Amendment to
     Loan Agreement (the "Second Amendment") dated March 16, 2001 between them.
     In connection with the Second Amendment, Borrower executed and delivered to
     Bank  that certain Renewal Promissory Note dated March 16, 2001 (the
     "Second Renewal Note") in the original principal amount of $4,000,000.

D.   Borrower and Bank desire to amend certain terms of the Loan Agreement, as
     amended, pursuant to the terms hereof to among other things increase the
     commitment.

     NOW, THEREFORE, in consideration of the agreements set forth herein and
other good and valuable consideration, the parties hereto hereby agree as
follows:

     Section 1.  Definitions.  All capitalized terms used herein shall have the
same meanings as used in Section 1 of the Loan Agreement, unless otherwise
defined in this Third Amendment.

     Section 2.  Amendments to Loan Agreement.  The Loan Agreement is hereby
amended in the following respects:

             (a)    Financial Information.  The second sentence of Section 4.1
                    ----------------------
     of the Loan Agreement shall be amended and restated as follows:
     "Additionally, the Borrower shall deliver to the Lender, within sixty (60)
     days after the end of each calendar quarter its quarterly 10-Qs."

             (b)    Other Conforming Changes:  Article 1 of the Loan Agreement
                    ------------------------
     is amended as follows:

                    (i)  Definition of Commitment Letter.  The definition of
                         -------------------------------
          Commitment Letter shall be amended to read as follows:

               "Commitment Letter" shall mean collectively, that
               certain letter agreement dated July 16, 1999 among the
               Lender, the Borrower and the Guarantors, that certain
               letter agreement dated September 6, 2000 among the
               Lender, the Borrower and the Guarantors, that certain
<PAGE>

               letter agreement dated January 22, 2001 among the
               Lender, the Borrower and the Guarantors, and that
               certain letter agreement dated September 10, 2001
               among the Lender, the Borrower, the Guarantors.

                    (ii)   Definition of Line of Credit Note.  The definition of
                           ----------------------------------
          Line of Credit Note shall be amended and restated to read as follows:

               "Line of Credit Note" shall mean that certain second
               renewal promissory note, dated September 21, 2001, of
               Borrower to Lender in the aggregate principal amount of
               Four Million Dollars ($4,000,000) which second renewal
               promissory note amended, renewed and updated that
               certain renewal promissory note, dated as of March 16,
               2001, of Borrower to Lender in the aggregate principal
               amount of Four Million Dollars ($4,000,000) which
               renewal promissory note amended, renewed and replaced
               that certain renewal promissory note, dated as of
               September 2, 2000, of Borrower to Lender in the
               aggregate principal amount of Three Million Five
               Hundred Thousand Dollars ($3,500,000), and that certain
               promissory note, dated September 23, 1999, of Borrower
               to Lender in the aggregate principal amount of Three
               Million Five Hundred Thousand Dollars ($3,500,000).

                    (iii)  Definition of Line of Credit Maturity Date.  The
                           ------------------------------------------
          definition of Line of Credit Maturity Date shall be amended and
          restated to lead as follows:

               "Line of Credit Maturity Date" shall mean September 23,
               2002 or such earlier date as payment of the Line of
               Credit shall be due and payable in full, whether by
               mandatory prepayment, acceleration or otherwise.

                    (iv)   Definition of Loan Documents.  The definition of the
                           ----------------------------
          term "Loan Documents" in the Loan Agreement shall include this Third
          Amendment, the Second Amendment, the First Amendment, the Line of
          Credit Note, the Security Agreement, the Commitment Letter and all
          other documents executed and delivered by the parties which evidence,
          secure or otherwise relate to the transaction contemplated by this
          First Amendment.

     Section 3.  No Event of Default.  Borrower hereby certifies to Bank that
(a) it has kept, observed, performed and fulfilled each and every covenant,
provision and condition of the Loan Agreement and the other Loan Documents on
its part to be performed, (b) that all representations and warranties of the
Borrower made in the Loan Agreement are true and correct as of the date hereof
except for those representations and warranties which are made as of a
------ ---
particular date, which such representations and warranties are true and correct
as of such date,  and (c) that no Event of Default or event which, with the
passage of time or the giving of notice or both, would constitute an Event of
Default has occurred and is continuing under the Loan Agreement, both before and
after giving effect to the amendment contemplated hereby.
<PAGE>

     Section 4.  Loan Agreement Confirmed.  The Loan Agreement, as amended
hereby, is reaffirmed and restated herein by Borrower and Bank, and said Loan
Agreement is hereby incorporated herein by reference as fully as if set forth in
its entirety in this Third Amendment.

     Section 5.  Conditions Precedent to Bank's Obligations.  Banks obligations
under this Third Amendment shall be subject to the satisfaction of each of the
following conditions precedent:

             (a)    Borrower shall have executed and deliver this Third
Amendment, the Second Renewal Note and all other documents requested by Bank and
all Loan Documents shall be in full force and effect.

             (b)    Bank shall have received (i) a certificate of the secretary
of Borrower certifying that attached thereto are true and correct copies of (A)
the bylaws of Borrower, as amended through the date of such certification and
(B) resolutions duly adopted by Borrower's board of directors authorizing the
execution, delivery and performance of the Loan Documents to which Borrower is a
party, which resolutions have not been altered or amended in any respect and
remain in full force and effect, (ii) the names of each of the officers of
Borrower authorized to execute and deliver the Loan Documents; (iii) a
certificate of the applicable State authority, dated as of a recent date, as to
the good standing of Borrower; and (iv) a certificate of the Florida Department
of State, dated as of a recent date, certifying that attached are true and
correct copies of the articles of incorporation of the Borrower filed with such
agency.

             (c)    Borrower shall cause to be delivered to Bank such other
documents, certificates or affidavits as may be reasonably requested by Bank in
connection with consummating the transaction evidenced by this Third Amendment.

             (d)    An opinion of counsel from counsel to Borrower in a form
reasonably satisfactory to Lender.

     Section 6.  Miscellaneous.

             (a)    Invalidity. In the event that any one or more of the
provisions contained in this Third Amendment shall, for any reason, be held
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provision of this Third Amendment.

             (b)    Counterparts. This Third Amendment may be executed in
several counterparts, and it shall not be necessary that the signatures of all
parties hereto be contained on any one counterpart hereof; each counterpart
shall be deemed an original, but all of which together shall constitute one and
the same instrument.

             (c)    Reference.  From and after the effective date hereof, all
references to the Loan Agreement shall be deemed to be references to the Loan
Agreement as amended by this Third Amendment.

             (d)    GOVERNING LAW. THIS THIRD AMENDMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF FLORIDA
WITHOUT GIVING EFFECT TO ITS CONFLICT OF LAW PRINCIPLES.

             (e)    Governing Document. In the event of a conflict between the
terms and conditions of this Third Amendment and the Commitment Letter, the
terms and conditions of this Third Amendment shall control in all respects.
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Third Amendment to
Loan Agreement to be duly executed and delivered by their respective
representatives thereunto duly authorized as of the date first above written.

                                   Borrower:

                                   ADVANCED ELECTRONIC SUPPORT PRODUCTS, INC.

                                   By: /s/ Slav Stein
                                      ---------------
                                   Name: Slav Stein
                                   Its:  President

                                   Bank:

                                   COMMERCEBANK, N.A.

                                   By: /s/ David S. Sauers
                                      --------------------
                                   Name: David F. Sauers
                                   Its:  Senior Vice President<PAGE>

                                                                   Exhibit 10.17

                                                                  Execution Copy
                                                                  --------------

                              TRANSMONTAIGNE INC.
                      TRANSMONTAIGNE PRODUCT SERVICES INC.
                          TRANSMONTAIGNE PIPELINE INC.
                        TRANSMONTAIGNE TERMINALING INC.
                              2750 Republic Plaza
                             370 Seventeenth Street
                            Denver, Colorado  80202

                               AMENDMENT NO. 3 OF
                  FOURTH AMENDED AND RESTATED CREDIT AGREEMENT

                                                    As of June 29, 2001

FLEET NATIONAL BANK
 (formerly known as BankBoston, N.A.),
 as Agent under the Credit Agreement
 defined herein
100 Federal Street
Boston, Massachusetts 02110

Ladies and Gentlemen:

    Each of TransMontaigne Inc. (the "Company") and TransMontaigne Product
                                      -------
Services Inc., each a Delaware corporation, and TransMontaigne Pipeline Inc. and
TransMontaigne Terminaling Inc., each an Arkansas corporation, hereby agrees
with you as follows:

1.  Reference to Credit Agreement and Definitions.  Reference is made to the
    ---------------------------------------------
Fourth Amended and Restated Credit Agreement dated as of February 11, 2000, as
amended by Amendment No. 1 thereto dated as of July 31, 2000 and as further
amended by Amendment No. 2 thereto dated as of March 30, 2001 (as so amended,
the "Credit Agreement"), among the Company, the Guarantors named therein, Fleet
     ----------------
National Bank (formerly known as BankBoston, N.A.), for itself and as Agent,
Bank of America, N.A., for itself and as Documentation Agent, First Union
National Bank, for itself and as Syndication Agent, and the other Lenders from
time to time party thereto.  Terms defined in the Credit Agreement and not
otherwise defined herein are used herein with the meanings so defined.

2.  Recital.  The Company has advised the Lenders that it desires certain
    -------
amendments to the Credit Agreement in order to prepay principal with respect to
certain outstanding indebtedness under the Master Shelf Agreement along with
accrued interest and applicable make-whole amounts.  The Required Lenders have
agreed to amend the relevant provisions of the Credit Agreement.
<PAGE>

3.   Amendments.  Subject to the accuracy of the representations and warranties
     ----------
set forth in Section 4 hereof and satisfaction of the conditions set forth in
Section 5 hereof, the Credit Agreement is hereby amended, effective as of the
date hereof, as follows:

     3.1. Section 6.10 of the Credit Agreement is amended by adding thereto a
new Section 6.10.4 reading in its entirety as follows:

          6.10.4.  So long as immediately before and after giving effect thereto
     no Default exists, the Company may make a prepayment of principal with
     respect to the Indebtedness under the Master Shelf Agreement in an amount
     not to exceed $25,000,000 (inclusive of any principal with respect to the
     Indebtedness under the Master Shelf Agreement prepaid pursuant to Section
     4.2.3 on or before July 6, 2001).

     3.2.  Section 6.10 of the Credit Agreement is further amended by amending
the last paragraph thereof to read in its entirety as follows:

           Notwithstanding Section 6.10.3, cash Distributions are not permitted
     under Section 6.10.3 unless, after giving effect to any such Distribution,
     the ratio (expressed as a percentage) of the Consolidated EBITDA of the
     Company and its Subsidiaries to Consolidated Fixed Charges of the Company
     and its Subsidiaries, in each case for the fiscal quarter in which such
     Distribution is proposed to occur, equals or exceeds 125%, as demonstrated
     in a certificate of the Company signed by a Financial Officer delivered to
     the Lenders prior to any such Distribution.

4.   Representations and Warranties.  In order to induce you to enter into this
     ------------------------------
Amendment, each of the Obligors hereby represents and warrants that each of the
representations and warranties contained in Section 7 of the Credit Agreement is
true and correct on the date hereof.

5.   Conditions to Effectiveness of Amendment.  Acceptance of the foregoing
     ----------------------------------------
amendments by the Required Lenders shall be subject, without limitation, to the
conditions that (a) no Default or Event of Default under the Credit Agreement
shall have occurred and be continuing, (b) Prudential and each other holder of
Indebtedness issued under the Master Shelf Agreement shall have consented to the
modifications of the Credit Agreement effected hereby upon terms satisfactory to
the Agent, and (c) the Company shall have paid in full the outstanding Term Loan
and Prudential and each other holder of Indebtedness issued under the Master
Shelf Agreement shall have consented thereto.  By their consent to this
Amendment, the Required Lenders also consent to any amendment of the Master
Shelf Agreement required to effect the foregoing.

6.   Required Lenders.  The Agent represents and warrants that it has received
     ----------------
consents to the foregoing amendments executed by the Required Lenders, in
satisfaction of the requirements of Section 12.6 of the Credit Agreement.

7.   Miscellaneous.  This Amendment may be executed in any number of
     -------------
counterparts, which together shall constitute one instrument, shall be a Credit
Document, shall be governed by and construed in accordance with the laws of The
Commonwealth of Massachusetts (without giving effect to the conflict of laws
rules of any jurisdiction) and shall bind and inure to the benefit of the
parties hereto and their respective successors and assigns, including as such
successors and assigns all holders of any Credit Obligation.

                                      -2-
<PAGE>

     If the foregoing corresponds with your understanding of our agreement,
please sign this letter and the accompanying copies thereof in the appropriate
space below and return the same to the undersigned.  This letter shall become a
binding agreement among each of the Lenders and the Agent when both the Company
and the Agent shall have one or more copies hereof executed by each of the
Company and the Agent on behalf of the Required Lenders.

                            Very truly yours,

                            TRANSMONTAIGNE INC.

                            By /s/ Donald H. Anderson
                               ---------------------------------------------
                               Donald H. Anderson, President

                            TRANSMONTAIGNE PRODUCT SERVICES INC.
                            TRANSMONTAIGNE PIPELINE INC.
                            TRANSMONTAIGNE TERMINALING INC.

                            By /s/ Donald H. Anderson
                               ---------------------------------------------
                               Donald H. Anderson, Chief Executive Officer
                               of each of the foregoing corporations

                                      -3-
<PAGE>

The foregoing Amendment is hereby agreed to:

FLEET NATIONAL BANK, as Agent under the Credit
 Agreement, on behalf of the Required Lenders

By: /s/  Terrence Ronan
   ------------------------------------
  Terrence Ronan, Managing Director

                                      -4-

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