Document:

<PAGE>

                                                                   EXHIBIT 10.45

                             THIRTEENTH AMENDMENT TO
                             -----------------------
                           LOAN AND SECURITY AGREEMENT
                           ---------------------------
                  AND AMENDMENT TO CERTAIN OTHER LOAN DOCUMENTS
                  ---------------------------------------------
                               AND LIMITED WAIVER
                               ------------------

     THIS THIRTEENTH AMENDMENT TO LOAN AND SECURITY AGREEMENT AND AMENDMENT TO
CERTAIN OTHER LOAN DOCUMENTS (the "Amendment") is made and entered into on this
                                   ---------
19th day of October, 2001, to be effective (unless otherwise specified herein)
as of October 15, 2001 (the "Effective Date"), by and among FLEET CAPITAL
                             --------------
CORPORATION, a Rhode Island corporation, successor in interest by merger to
FLEET CAPITAL CORPORATION, a Connecticut corporation, formerly known as SHAWMUT
CAPITAL CORPORATION, successor in interest by assignment to BARCLAYS BUSINESS
CREDIT, INC. ("Lender"), LOWRANCE ELECTRONICS, INC., a Delaware corporation
               ------
("Lowrance"), LEI EXTRAS, INC., a Delaware corporation ("LEI"), LOWRANCE
  --------
CONTRACTS, INC., a Delaware corporation ("Lowrance Contracts"), and SEA
                                          ------------------
ELECTRONICS, INC., an Oklahoma corporation ("Sea Electronics") (Lowrance, LEI,
                                             ---------------
Lowrance Contracts and Sea Electronics are herein individually and collectively
called "Borrower").
        --------

                                    RECITALS

     A.      Borrower, Lowrance Australia Pty Limited ("Lowrance Australia") and
                                                        ------------------
Lender have entered into that certain Loan and Security Agreement, dated
December 15, 1993, as amended by (i) that certain First Amendment to Loan and
Security Agreement, dated October 16, 1995, by and among Lender, Borrower and
Lowrance Australia, (ii) that certain Second Amendment to Loan and Security
Agreement, dated November 1, 1996 by and among Lender and Borrower, (iii) that
certain Third Amendment to Loan and Security Agreement, dated December 30, 1996,
by and among Lender and Borrower, (iv) that certain Fourth Amendment to Loan and
Security Agreement, entered into effective as of April 1, 1997, by and among
Lender and Borrower, (v) that certain Fifth Amendment to Loan and Security
Agreement, entered into effective as of August 25, 1997, by and between Lender
and Borrower ("Fifth Amendment"), (vi) that certain Sixth Amendment to Loan and
               ---------------
Security Agreement and Certain Other Loan Documents, entered into effective as
of August 28, 1997, by and between Lender and Borrower, (vii) that certain
Seventh Amendment to Loan and Security Agreement, entered into effective as of
November 1, 1996, by and between Lender and Borrower, (viii) that certain Eighth
Amendment to Loan and Security Agreement, made and entered into as of December
9, 1997, by and between Lender and Borrower, (ix) that certain Ninth Amendment
to Loan and Security Agreement made and entered into as of September 14, 1998,
by and between Lender and Borrower, (x) that certain Tenth Amendment to Loan and
Security Agreement and Amendment to Certain Other Loan Documents, executed in
November of 1998, by Lender and Borrower; (xi) that certain Eleventh Amendment
to Loan and Security Agreement and Amendment to Certain Other Loan Documents,
executed March 14, 2000, by Lender and Borrower, and (xii) that certain Twelfth
Amendment to Loan and Security Agreement and Amendment to Certain Other Loan
Documents, executed October 15, 2000, by Lender and Borrower (as amended, the
"Loan Agreement").
 --------------

                                       1

<PAGE>

     B.      Borrower and Lender desire to amend the Loan Agreement and certain
of the other Loan Documents as hereinafter set forth.

     NOW, THEREFORE, in consideration of the premises herein contained and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties, intending to be legally bound, agree as follows:

                                    ARTICLE I
                                   Definitions
                                   -----------

     1.01    Capitalized terms used in this Amendment are defined in the Loan
Agreement, as amended hereby, unless otherwise stated.

                                   ARTICLE II
                                   Amendments
                                   ----------

     2.01    Amendment to Section 1.1 of the Loan Agreement; Addition of
             -----------------------------------------------------------
Definition of "EBITDA." Effective as of the Effective Date, a new definition,
---------------------
"EBITDA," is hereby added to Section 1.1 of the Loan Agreement to read as
                             -----------
follows:

     "EBITDA - for Borrower for any period means the sum of (i) Adjusted Net
      ------                                         ------
     Earnings From Operations during such period, (ii) Interest Expense during
     such period, (iii) depreciation and amortization during such period (to the
     extent the same were deducted in determining Adjusted Net Earnings From
     Operations for such period and (iv) taxes for such period (to the extent
     the same were deducted in determining Adjusted Net Earnings From Operations
     for such period)."

     2.02    Amendment to Section 1.1 of the Loan Agreement; Amendment of
             ------------------------------------------------------------
Definition of "Fixed Charge Ratio." Effective as of the Effective Date, the
---------------------------------
definition of "Fixed Charge Ratio" contained in Section 1.1 of the Loan
                                                -----------
Agreement is hereby amended and restated to read in its entirety as follows:

     "Fixed Charge Ratio" - for Borrower for any period means the ratio of (i)
      ------------------
     (a) EBITDA for such period, minus (b) the sum of (x) Unfinanced Capital
                                 -----
     Expenditures during such period and (y) taxes incurred during such period
     (whether or not paid); to (ii) the sum of (a) Interest Expense during such
                                    ----------
     period, and (b) scheduled principal payments on Borrower's long-term
     Indebtedness (including, without limitation, scheduled principal
     amortization on Capitalized Lease Obligations) during such period."

     2.03    Amendment to Section 1.1 of the Loan Agreement; Amendment of
             ------------------------------------------------------------
Definition of "Temporary Finished Goods Eligible Inventory Increased Amount.".
---------------------------------------------------------------------------
Effective as of the Effective Date, the definition of "Temporary Finished Goods
Eligible

                                       2

<PAGE>

Inventory Increased Amount" contained in Section 1.1 of the Loan Agreement is
                                         -----------
hereby amended and restated to read in its entirety as follows:

          "Temporary Finished Goods Eligible Inventory Increased Amount - the
           ------------------------------------------------------------
     amount indicated below, during the time period indicated below:

<TABLE>
<CAPTION>
     Time Period                                            Maximum Amount
     -----------                                            --------------
     <S>                                                    <C>
     (a)   First Use through the earlier to occur of        (a)    the lesser of (i) $1,500,000 or
           the 68th day after First Use or January                 (ii) 20% of the value of Finished
           18, 2002                                                Goods Eligible Inventory at the
                                                                   relevant calculation date

     (b)   Seven day period beginning on the day            (b)    the lesser of (i) $1,125,000 or
           immediately succeeding the end of the                   (ii) 20% of the value of Finished
           period described in (a) above                           Goods Eligible Inventory at the
                                                                   relevant calculation date

     (c)   Seven day period beginning on the day            (c)    the lesser of (i) $750,000 or
           immediately succeeding the end of the                   (ii) 20% of the value of
           period described in (b) above                           Finished Goods Eligible
                                                                   Inventory at the relevant
                                                                   calculation date

     (d)   Seven day period beginning on the day            (d)    the lesser of (i) $375,000 or
           immediately succeeding the end of the                   (ii) 20% of the value of
           period described in (c) above                           Finished Goods Eligible
                                                                   Inventory at the relevant
                                                                   calculation date

     (e)   Earlier to occur of (i) February 12, 2002        (e)    $0.00"
           or (ii) the day immediately succeeding the
           end of the period described in (d) above,
           and at all times thereafter
</TABLE>

     2.04    Amendment to Section 1.1 of the Loan Agreement; Amendment of
             ------------------------------------------------------------
Definition of "Temporary Finished Goods Eligible Inventory Increased Amount
---------------------------------------------------------------------------
Period." Effective as of the Effective Date, the definition of "Temporary
------
Finished Goods Eligible Inventory Increased Amount Period" contained in
Section 1.1 of the Loan Agreement is hereby amended and restated to read in its
-----------
entirety as follows:

                                       3

<PAGE>

          "Temporary Finished Goods Eligible Inventory Increased Amount Period -
           -------------------------------------------------------------------
     the period of time beginning on (i) the first day after October 15, 2001,
     that the Borrower requests that the Temporary Finished Goods Eligible
     Inventory Increased Amount be included in the calculation of the Borrowing
     Base (the `First Use') and ending on (ii) the earlier to occur of February
                ---------
     12, 2002 or the ninetieth day after the First Use."

     2.05    Acknowledgment of Increase of Applicable Annual Rate to Base Rate
             -----------------------------------------------------------------
plus 1.00%. Borrower hereby agrees and acknowledges that due to the provisions
----------
of the last sentence of Section 3.1(A) of the Loan Agreement, effective as of
                        --------------
October 1, 2001, the Applicable Annual Rate relating to the Term Loans, the
Equipment Loans, and the Revolving Credit Loans was permanently increased to
1.00% above the Base Rate.

     2.06    Increase in Applicable Annual Rate during Temporary Finished Goods
             ------------------------------------------------------------------
Eligible Inventory Increased Amount Period. Effective as of the Effective Date,
------------------------------------------
the parties hereto agree that notwithstanding anything to the contrary in the
Loan Agreement or any other Loan Document, during the Temporary Finished Goods
Eligible Inventory Increased Amount Period, the Applicable Annual Rate relating
to the Term Loans, the Equipment Loans and the Revolving Credit Loans shall be
increased to 2.00% above the Base Rate.

     2.07    Amendments to Section 9.3 of the Loan Agreement. Effective as of
             -----------------------------------------------
the Effective Date, Section 9.3 of the Loan Agreement is amended as follows:
                    -----------

             (a) Section 9.3(C) of the Loan Agreement is amended and restated to
                 --------------
     read in its entirety as follows:

                    "(C) Fixed Charge Ratio. Maintain on a Consolidated basis a
                         ------------------
             Fixed Charge Ratio of not less than 1.1 to 1.0 for the twelve
             calendar month period ending on the last day of each July,
             October, January and April, beginning with July 30, 2002."

             (b) A new Section 9.3(D) is added to the Loan Agreement to read
                       --------------
     as follows:

                    "(D) Minimum EBITDA. Maintain, on a Consolidated basis,
                         --------------
             EBITDA of not less than the amount shown below for the twelve
             calendar month ending on the date corresponding thereto:

                      Date                                      Amount
                      ----                                      ------
             (a)    October 31, 2001                       (a)    $2,832,000
             (b)    January 31, 2002                       (b)    $1,251,000
             (c)    April 30, 2002                         (c)    $2,355,000
             (d)    July 31, 2002                          (d)    $3,174,000"

                                       4

<PAGE>

             (c) A new Section 9.3(E) is added to the Loan Agreement to read as
                 --------------------------------------------------------------
     follows:
     -------

                    "(E) Maximum Inventory. Maintain on a Consolidated basis
                         -----------------
             Inventory with an aggregate value (calculated on the basis of the
             higher of cost or market with cost calculated on a first-in,
             first-out basis) of not more than the amount shown below as of
             the date indicated below:

                      Date                                      Amount
                      ----                                      ------
             (b)    January 31, 2002                       (b)    $21,500,000
             (c)    April 30, 2002                         (c)    $16,750,000
             (d)    July 31, 2002                          (d)    $14,000,000"

     2.08    Deferral of Principal Payments due on November 1, 2001, December 1,
             -------------------------------------------------------------------
2001, and January 1, 2002 on the $4,800,000.02 Term Note. Effective as of the
--------------------------------------------------------
Effective Date, and notwithstanding any provision to the contrary contained in
the $4,800,000.02 Term Note, the Loan Agreement or any other Loan Document, the
parties hereto hereby agree as follows:

             (a) Borrower shall not be required to make on November 1, 2001,
     December 1, 2001, and January 1, 2002, the otherwise regularly scheduled
     monthly principal amortization payments on the $4,800,000.02 Term Note.

             (b) The monthly principal amortization payments scheduled to be
     made on the $4,800,000.02 Term Note on February 1, 2002, March 1, 2002,
     April 1, 2002, May 1, 2002, June 1, 2002, and July 1, 2002, shall be
     increased from $80,000 to $120,000.

             (c) Beginning August 1, 2002, the regularly scheduled monthly
     principal amortization payments on the $4,800,000.02 Term Note shall return
     to $80,000 a month.

     2.09    Deferral of Principal Payments due on November 1, 2001, December 1,
             -------------------------------------------------------------------
2001, and January 1, 2002 on the Term Note. Effective as of the Effective Date,
------------------------------------------
and notwithstanding anything to the contrary in the Term Note, the Loan
Agreement or any other Loan Document, the parties hereto agree as follows:

             (a) Borrower shall not be required to make on November 1, 2001,
     December 1, 2001, and January 1, 2002, the otherwise regularly scheduled
     monthly principal amortization payments on the Term Note.

             (b) The monthly principal amortization payments scheduled to be
     made on the Term Note on February 1, 2002, March 1, 2002, April 1, 2002,

                                       5

<PAGE>

     May 1, 2002, June 1, 2002 and July 1, 2002 shall be increased from $23,167
     to $34,750.50.

             (c) Beginning August 1, 2002, the regularly scheduled monthly
     principal amortization payments on the Term Note shall return to $23,167 a
     month.

     2.10    Amendment to Section 12.4 of the Loan Agreement. Effective as of
             -----------------------------------------------
the Effective Date, Section 12.4 of the Loan Agreement is amended by adding
                    ------------
thereto after the last sentence of Section 12.4 the following sentence to read
                                   ------------
in its entirety as follows:

     "In addition to the foregoing provisions of this Section 12.4, Borrower on
                                                      ------------
     demand shall reimburse Lender for all out-of-pocket expenses and costs
     incurred by Lender in connection with audits, appraisals and examination of
     Borrower or the books and records or Property of Borrower, and shall pay to
     Lender an examination fee in the amount of $750.00 per auditor per day in
     connection with each audit or examination or appraisal of Borrower or the
     books and records or Property of Borrower; provided, however, in the event
                                                --------  -------
     of a conflict between the provisions of this sentence and any other
     sentence or provision in this Agreement, the provisions of this sentence
     shall control."

     2.11    Amendment Fee. In consideration for the agreements of Lender
             -------------
contained herein but subject to Section 3.1(D) of the Loan Agreement, Borrower
                                --------------
agrees to pay Lender a fee of $50,000. Such fee shall be due and payable and
shall be fully earned as of the date of execution of this Amendment.

                                   ARTICLE III
                              Conditions Precedent
                              --------------------

     3.01    Conditions Precedent. The effectiveness of this Amendment is
             --------------------
subject to the satisfaction of the following conditions precedent, unless
specifically waived in writing by Lender:

             (a) Lender shall have received each of the following, each in form
     and substance satisfactory to Lender: (i) this Amendment, duly executed by
     Borrower; and (ii) such additional documents, instruments and information
     as Lender or its legal counsel may request;

             (b) The representations and warranties contained herein, in the
      Loan Agreement and in the other Loan Documents, as each is amended hereby,
     shall be true and correct as of the date hereof, as if made on the date
     hereof;

                                       6

<PAGE>

             (c) After giving effect to this Amendment, no Default or Event of
     Default shall have occurred and be continuing, unless such Default or Event
     of Default has been specifically waived in writing by Lender;

             (d) All corporate proceedings taken in connection with the
     transactions contemplated by this Amendment and all documents, instruments
     and other legal matters incident thereto shall be satisfactory to Lender
     and its legal counsel; and

             (e) Lender shall have received, in immediately available funds,
     payment of the fee described in Section 2.11 of this Amendment.
                                     ------------

                                   ARTICLE IV
                                 Limited Waiver
                                 --------------

     Upon satisfaction of the conditions and covenants set forth in Section 3.01
                                                                    ------------
of this Amendment, Lender hereby waives any Default or Event of Default which
occurred due to the failure by Borrower to maintain as of July 31, 2001, on a
Consolidated basis a Fixed Charge Ratio (as such term was defined prior to
giving effect to the provisions of this Amendment) of not less than the ratio
specified in Section 9.3(C) of the Loan Agreement (as Section 9.3(C) read prior
             --------------                           --------------
to giving effect to the provisions of this Amendment). Except as otherwise
provided for in this Amendment, nothing contained in this Amendment shall be
construed as a waiver by Lender of any covenant or provision of the Loan
Agreement, the other Loan Documents, this Amendment, or of any other contract or
instrument between Borrower and Lender, and the failure of Lender at any time or
times hereafter to require strict performance by Borrower of any provision
thereof shall not waive, affect or diminish any right of Lender to thereafter
demand strict compliance therewith. Lender hereby reserves all rights granted
under the Loan Agreement, the other Loan Documents, this Amendment and any other
contract or instrument between Borrower and Lender.

                                    ARTICLE V
                  Ratifications, Representations and Warranties
                  ---------------------------------------------

     5.01    Ratifications. The terms and provisions set forth in this Amendment
             -------------
shall modify and supersede all inconsistent terms and provisions set forth in
the Loan Agreement and the other Loan Documents, and, except as expressly
modified and superseded by this Amendment, the terms and provisions of the Loan
Agreement and the other Loan Documents are ratified and confirmed and shall
continue in full force and effect. Borrower and Lender agree that the Loan
Agreement and the other Loan Documents, as amended hereby, shall continue to be
legal, valid, binding and enforceable in accordance with their respective terms.

     5.02    Representations and Warranties. Borrower hereby represents and
             ------------------------------
warrants to Lender that (a) the execution, delivery and performance of this
Amendment and any and all other Loan Documents executed and/or delivered in
connection herewith have been authorized by all requisite corporate action on
the part of Borrower and will not violate the Certificate of Incorporation or
Bylaws of Borrower; (b) the representations and warranties contained in the

                                       7

<PAGE>

Loan Agreement, as amended hereby, and any other Loan Documents are true and
correct on and as of the date hereof and on and as of the date of execution
hereof as though made on and as of each such date; (c) no Default or Event of
Default under the Loan Agreement, as amended hereby, has occurred and is
continuing; (d) Borrower is in full compliance with all covenants and agreements
contained in the Loan Agreement and the other Loan Documents, as amended hereby;
(e) the Borrower's Certificate of Incorporation and Bylaws are in full force and
effect on and as of the date hereof without modification or amendment in any
respect since November 1, 1996; (f) as of the date hereof, (i) Borrower is in
existence and in corporate and tax good standing in the State of its
organization, (ii) the Borrower is qualified to do business as a foreign
corporation and is in corporate and tax good standing in each jurisdiction where
Borrower is doing business and is required to be so qualified, (iii) Borrower
does not owe franchise taxes or other taxes required to maintain its corporate
existence and no franchise tax reports are due, and (iv) no proceedings are
pending for forfeiture of the Borrower's charter or for its dissolution either
voluntarily or involuntarily; and (g) the officer of Borrower executing this
Amendment has been duly elected and is, at present, qualified and acting in the
office indicated below such officer's name and is duly authorized to execute
this Amendment on behalf of Borrower.

                                   ARTICLE VI
                            Miscellaneous Provisions
                            ------------------------

     6.01    Survival of Representations and Warranties. All representations and
             ------------------------------------------
warranties made in the Loan Agreement or any other Loan Document, including,
without limitation, any document furnished in connection with this Amendment,
shall survive the execution and delivery of this Amendment and the other Loan
Documents, and no investigation by Lender or any closing shall affect the
representations and warranties or the right of Lender to rely upon them.

     6.02    Reference to Loan Agreement. Each of the Loan Agreement and the
             ---------------------------
other Loan Documents, and any and all other agreements, documents or instruments
now or hereafter executed and delivered pursuant to the terms hereof or pursuant
to the terms of the Loan Agreement, as amended hereby, are hereby amended so
that any reference in the Loan Agreement and such other Loan Documents to the
Loan Agreement shall mean a reference to the Loan Agreement, as amended hereby.

     6.03    Expenses of Lender. As provided in the Loan Agreement, Borrower
             ------------------
agrees to pay on demand all costs and expenses incurred by Lender in connection
with the preparation, negotiation and execution of this Amendment and the other
Loan Documents executed pursuant hereto and any and all amendments,
modifications, and supplements thereto, including, without limitation, the costs
and fees of Lender's legal counsel, and all costs and expenses incurred by
Lender in connection with the enforcement or preservation of any rights under
the Loan Agreement, as amended hereby, or any other Loan Documents, including,
without, limitation, the costs and fees of Lender's legal counsel.

     6.04    Severability. Any provision of this Amendment held by a court of
             ------------
competent jurisdiction to be invalid or unenforceable shall not impair or
invalidate the remainder of this

                                       8

<PAGE>

Amendment and the effect thereof shall be confined to the provision so held to
be invalid or unenforceable.

     6.05    Successors and Assigns. This Amendment is binding upon and shall
             ----------------------
inure to the benefit of Lender and Borrower and their respective successors and
assigns, except that Borrower may not assign or transfer any of its rights or
obligations hereunder without the prior written consent of Lender.

     6.06    Counterparts. This Amendment may be executed in one or more
             ------------
counterparts, each of which when so executed shall be deemed to be an original,
but all of which when taken together shall constitute one and the same
instrument.

     6.07    Effect of Waiver. No consent or waiver, express or implied, by
             ----------------
Lender to or for any breach of or deviation from any covenant or condition by
Borrower shall be deemed a consent to or waiver of any other breach of the same
or any other covenant, condition or duty.

     6.08    Headings. The headings, captions, and arrangements used in this
             --------
Amendment are for convenience only and shall not affect the interpretation of
this Amendment.

     6.09    Applicable Law. THIS AMENDMENT AND ALL OTHER LOAN DOCUMENTS
             --------------
EXECUTED PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN MADE AND TO BE PERFORMABLE
IN AND SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF TEXAS.

     6.10    Final Agreement. THE LOAN AGREEMENT AND THE OTHER LOAN DOCUMENTS,
             ---------------
EACH AS AMENDED HEREBY, REPRESENT THE ENTIRE EXPRESSION OF THE PARTIES WITH
RESPECT TO THE SUBJECT MATTER HEREOF ON THE DATE THIS AMENDMENT IS EXECUTED. THE
LOAN AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS AMENDED HEREBY, MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS
OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES. NO
MODIFICATION, RESCISSION, WAIVER, RELEASE OR AMENDMENT OF ANY PROVISION OF THIS
AMENDMENT SHALL BE MADE, EXCEPT BY A WRITTEN AGREEMENT SIGNED BY BORROWER AND
LENDER.

     6.11    Release. BORROWER HEREBY ACKNOWLEDGES THAT IT HAS NO DEFENSE,
             -------
COUNTERCLAIM, OFFSET, CROSS-COMPLAINT, CLAIM OR DEMAND OF ANY KIND OR NATURE
WHATSOEVER THAT CAN BE ASSERTED TO REDUCE OR ELIMINATE ALL OR ANY PART OF ITS
LIABILITY TO REPAY THE "OBLIGATIONS" OR TO SEEK AFFIRMATIVE RELIEF OR DAMAGES OF
ANY KIND OR NATURE FROM LENDER. BORROWER HEREBY VOLUNTARILY AND KNOWINGLY
RELEASES AND FOREVER DISCHARGES LENDER, ITS PREDECESSORS, OFFICERS, DIRECTORS,
AGENTS, EMPLOYEES, SUCCESSORS AND ASSIGNS, FROM ALL POSSIBLE CLAIMS, DEMANDS,
ACTIONS, CAUSES OF ACTION, DAMAGES, COSTS,

                                       9

<PAGE>

EXPENSES, AND LIABILITIES WHATSOEVER, KNOWN OR UNKNOWN, ANTICIPATED OR
UNANTICIPATED, SUSPECTED OR UNSUSPECTED, FIXED, CONTINGENT, OR CONDITIONAL, AT
LAW OR IN EQUITY, ORIGINATING IN WHOLE OR IN PART ON OR BEFORE THE DATE THIS
AMENDMENT IS EXECUTED, WHICH THE BORROWER MAY NOW OR HEREAFTER HAVE AGAINST
LENDER, ITS PREDECESSORS, OFFICERS, DIRECTORS, AGENTS, EMPLOYEES, SUCCESSORS AND
ASSIGNS, IF ANY, AND IRRESPECTIVE OF WHETHER ANY SUCH CLAIMS ARISE OUT OF
CONTRACT, TORT, VIOLATION OF LAW OR REGULATIONS, OR OTHERWISE, AND ARISING FROM
ANY "LOANS", INCLUDING, WITHOUT LIMITATION, ANY CONTRACTING FOR, CHARGING,
TAKING, RESERVING, COLLECTING OR RECEIVING INTEREST IN EXCESS OF THE HIGHEST
LAWFUL RATE APPLICABLE, THE EXERCISE OF ANY RIGHTS AND REMEDIES UNDER THE LOAN
AGREEMENT OR OTHER LOAN DOCUMENTS, AND THE NEGOTIATION OF AND EXECUTION OF THIS
AMENDMENT.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       10

<PAGE>

     IN WITNESS WHEREOF, this Amendment has been executed and is effective as of
the date first above-written.

                                "LENDER"

                                FLEET CAPITAL CORPORATION

                                By:
                                    --------------------------------------------
                                Name:
                                      ------------------------------------------
                                Title:
                                       -----------------------------------------

                                "BORROWER"

                                LOWRANCE ELECTRONICS, INC.

                                By:
                                    --------------------------------------------
                                Name:
                                      ------------------------------------------
                                Title:
                                       -----------------------------------------

                                LEI EXTRAS, INC.

                                By:
                                    --------------------------------------------
                                Name:
                                      ------------------------------------------
                                Title:
                                       -----------------------------------------

                                LOWRANCE CONTRACTS, INC.

                                By:
                                    --------------------------------------------
                                Name:
                                      ------------------------------------------
                                Title:
                                       -----------------------------------------

                                SEA ELECTRONICS, INC.

                                By:
                                    --------------------------------------------
                                Name:
                                      ------------------------------------------
                                Title:
                                       -----------------------------------------<PAGE>

                                                                     Exhibit 4.2

                            AVIATION SALES COMPANY,

                                    Issuer,

                    THE SUBSIDIARY GUARANTORS NAMED HEREIN

                                      and

                                 SUNTRUST BANK
       (FORMERLY, SUNTRUST BANK, CENTRAL FLORIDA, NATIONAL ASSOCIATION),

                                    Trustee

                            SUPPLEMENTAL INDENTURE

                           Dated as of [_______,] 2001

                              Up to $250,000,000

                   8-1/8% SENIOR SUBORDINATED NOTES DUE 2008

Supplementing the Indenture dated as of February 17, 1998 among AVIATION SALES
COMPANY and AVIATION SALES DISTRIBUTION SERVICES COMPANY f/k/a AVIATION SALES
OPERATING COMPANY, AVIATION SALES LEASING COMPANY, AVIATION SALES FINANCE
COMPANY, AVS/M-1, INC. f/k/a AVIATION SALES MANUFACTURING COMPANY, AVS/M-2, INC.
f/k/a AVS/KRATZ-WILDE MACHINE COMPANY, AEROCELL STRUCTURES, INC., AVS/M-3, INC.
f/k/a APEX MANUFACTURING, INC., AVIATION SALES MAINTENANCE, REPAIR & OVERHAUL
COMPANY, AVIATION SALES PROPERTY MANAGEMENT COMPANY, TIMCO ENGINE CENTER, INC.,
WHITEHALL CORPORATION, TRIAD INTERNATIONAL MAINTENANCE CORPORATION, AVS/CAI,
INC. f/k/a CARIBE AVIATION, INC., AIRCRAFT INTERIOR DESIGN, INC., AERO HUSHKIT
CORPORATION, HYDOSCIENCE, INC., TIMCO ENGINEERED SYSTEMS, INC., AVSRE, L.P., and
AVIATION SALES SPS I, INC., as Guarantors, and SunTrust Bank (formerly, SunTrust
Bank, Central Florida, National Association), as Trustee, as such Indenture was
supplemented before the date hereof.
<PAGE>

     THIS SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of
                                        ----------------------
[__________], 2001, among Aviation Sales Company, a Delaware corporation (the
"Company"), Aviation Sales Distribution Services Company f/k/a/Aviation Sales
 -------
Operating Company, Aviation Sales Leasing Company, Aviation Sales Finance
Company, AVS/M-1, Inc. f/k/a Aviation Sales Manufacturing Company, AVS/M-2, Inc.
f/k/a/ AVS/Kratz Wilde Machine Company, Aerocell Structures, Inc., AVS/M-3, Inc.
f/k/a Apex Manufacturing, Inc., Aviation Sales Maintenance, Repair & Overhaul
Company, Aviation Sales Property Management Company, TIMCO Engine Center, Inc.,
Whitehall Corporation, Triad International Maintenance Corporation, AVS/CAI,
Inc. f/k/a Caribe Aviation, Inc., Aircraft Interior Design, Inc., Aero Hushkit
Corporation, Hydoscience, Inc., TIMCO Engineered Systems, Inc., AVSRE, L.P., and
Aviation Sales SPS I, Inc. (collectively, the "Subsidiary Guarantors") and
                                               ---------------------
SunTrust Bank (formerly, SunTrust Bank, Central Florida, National Association),
a Georgia banking corporation, as Trustee (the "Trustee"), under the Indenture
                                                -------
dated as of February 17, 1998, among the Company, certain of the Subsidiary
Guarantors and the Trustee, as such Indenture was supplemented by Supplemental
Indentures dated as of March 6, 1998, August 3, 1998, September 11, 1998, March
10, 1999, November 22, 1999, and June 5, 1998 (as supplemented before the date
hereof, the "Indenture"). Capitalized terms used herein and not otherwise
             ---------
defined herein shall have the respective meanings assigned to them in the
Indenture.

                             W I T N E S S E T H:
                             -------------------

     WHEREAS, the Company has issued its 8-1/8% Senior Subordinated Notes due
2008 (the "Notes") pursuant to the Indenture;
           -----

     WHEREAS, the Company has made an offer to Holders of the Notes (the
"Exchange Offer") to exchange the Notes for certain cash and securities, as more
 --------------
particularly described in the Company's Registration Statement on Form S-4 (File
No. 333-69464);

     WHEREAS, in connection with the Exchange Offer, the Company has requested
that Holders of the Notes deliver their consents with respect to amendments of
certain provisions of the Indenture;

     WHEREAS, Section 9.02 of the Indenture provides that, subject to certain
restrictions, with the consent of the Holders of at least a majority in
principal amount of the Notes then outstanding voting as a single class, the
Company, when authorized by a resolution of its Board of Directors, the
Subsidiary Guarantors and the Trustee may, from time to time and at any time,
enter into an indenture or indentures supplemental to the Indenture for the
purpose of adding any provisions to or changing in any manner or eliminating any
of the provisions of the Indenture or of any supplemental indenture or of
modifying in any manner the rights of the Holders of the Notes;

     WHEREAS, the Holders of not less than a majority in principal amount of the
Notes outstanding have duly consented to the proposed modifications set forth in
this Supplemental Indenture in accordance with Section 9.02 of the Indenture;
<PAGE>

     WHEREAS, in accordance with Section 9.02 of the Indenture, the Company has
heretofore delivered or is delivering contemporaneously herewith to the Trustee
(i) a copy of resolutions of the Board of Directors of the Company, certified by
the Secretary or an Assistant Secretary of the Company, authorizing the
execution, delivery and performance of this Supplemental Indenture, and (ii)
evidence of the written consent of the Holders referenced in the immediately
preceding paragraph;

     WHEREAS, all conditions necessary to authorize the execution and delivery
of this Supplemental Indenture and to make this Supplemental Indenture valid and
binding have been complied with or have been done or performed; and

     NOW, THEREFORE, in consideration of the foregoing and notwithstanding any
provision of the Indenture which, absent this Supplemental Indenture, might
operate to limit such action, the parties hereto, intending to be legally bound
hereby, agree as follows.

                                  ARTICLE ONE
                                  AMENDMENTS

     SECTION 1.01.

          (a)  Deleted Sections and Article. Subject to Section 3.01 hereof, the
     Indenture is hereby amended by deleting in their entireties the current
     texts of the provisions of Sections 3.09, 4.04, 4.05, 4.06, 4.07, 4.08,
     4.09, 4.10, 4.11, 4.12, 4.13, 4.14, 4.15, 4.16, 4.17, 4.18, 6.01 (c), (d),
     (e), (f), (g), (h) and (i), 6.03 and Article 5, and substituting for the
     texts of each of those provisions the words "This provision is
     intentionally omitted." Effective as of the date hereof, none of the
     Company, the Subsidiary Guarantors, the Trustee or other parties to or
     beneficiaries of the Indenture shall have any rights, obligations or
     liabilities under such deleted Sections or Article and such Sections and
     Article shall not be considered in determining whether a Default or Event
     of Default has occurred or whether the Company or any of the Subsidiary
     Guarantors has observed, performed or complied with the provisions of the
     Indenture.

          (b)  Amended Definitions and Sections. Subject to Section 3.01 hereof,
     the following provisions of the Indenture are hereby amended as follows:

               (i)  The following definitions in Section 1.01 of the Indenture
     are hereby amended to read in their entirety, respectively, as follows:

                    a.  "Designated Senior Debt" means (i) any Indebtedness
     outstanding under the Credit Facility; (ii) any amounts due under the TROL
     Financing (whether or not deemed Indebtedness) and (iii) any other Senior
     Debt permitted under this Indenture the principal amount of which is $25
     million or more and that has been designated by the Company as "Designated
     Senior Debt."

                                       2
<PAGE>

                     b.  "Obligations" means any principal, interest, penalties,
     fees, indemnifications, reimbursements, damages and other liabilities
     payable under the documentation governing any Indebtedness or under the
     TROL Financing (whether or not deemed Indebtedness).

                     c.  "Senior Debt" means (i) all Indebtedness outstanding
     under the Credit Facility, the Existing Indebtedness, the TROL Financing
     (whether or not deemed Indebtedness), all Hedging Obligations with respect
     to any of the foregoing, and, after a default has occurred and is
     continuing under the Credit Facility, all other Indebtedness arising from
     intercompany loans and advances owing by the Company or any of the
     Guarantors which constitutes part of the collateral security for the Credit
     Facility and such Hedging Obligations, including, without limitation,
     indebtedness evidenced by intercompany notes pledged or assigned in
     connection with the Credit Facility, (ii) any other Indebtedness permitted
     to be incurred by the Company or a Guarantor under the terms of this
     Indenture, unless the instrument under which such Indebtedness is incurred
     expressly provides that it is on a parity with or subordinated in right of
     payment to the Notes and (iii) all Indebtedness outstanding under the 8%
     Senior Subordinated Convertible PIK Notes due 2006 of the Company and (iv)
     all Obligations with respect to the foregoing. Notwithstanding anything to
     the contrary in the foregoing, Senior Debt will not include (v) the 8 1/8%
     Senior Subordinated Notes due 2008 of the Company, (w) any liability for
     federal, state, local or other taxes owed or owing by the Company or a
     Guarantor, (x) any Indebtedness between or among the Company, any of its
     Subsidiaries or any of its other Affiliates, except to the extent such
     Indebtedness is within the scope of clause (i) above, (y) any trade
     payables or (z) any Indebtedness that is incurred in violation of this
     Indenture.

               (ii)  The following definition is hereby added to Section 1.01,
     between the definitions therein of "Trading Day" and Trustee":

     "TROL Financing" means that certain Lease Agreement between the Company and
     First Security Bank, N.A., as Owner Trustee, dated December 17, 1998, the
     guarantees thereof by its Subsidiaries and related operative agreements,
     each as amended and modified from time to time.

               (iii) Section 4.02 is amended to delete the first paragraph
     thereof, and to change the first sentence of the second paragraph thereof
     to read in its entirety as follows: "The Company shall from time to time
     designate, and may from time to time change its designation of, one or more
     offices or agencies where the Notes may be presented or surrendered for
     registration of transfer or for exchange and where notices and demands to
     or upon the Company in respect of the Notes and this Indenture may be
     served. The Company shall give prompt written notice to the Trustee of the
     location, and any change in the location, of each such office or agency."

               (iv)  Section 6.01(a) is amended to change "30 days" to "90
     days."

                                       3
<PAGE>

          SECTION 1.02.  Deleted Definitions. Subject to Section 3.01 hereof,
the Indenture is hereby amended by deleting any definitions from the Indenture
with respect to which references would be eliminated as a result of the
amendment of the Indenture pursuant to Section 1.01 hereof.

                                  ARTICLE TWO
                                    WAIVERS

          SECTION 2.01.  Waiver of Defaults.  Subject to Section 6.04 of the
Indenture, effective as of the date hereof, any and all existing defaults,
including but not limited to any resulting from the consummation of the Exchange
Offer, are hereby waived.

                                 ARTICLE THREE
                                 MISCELLANEOUS

          SECTION 3.01.  Terms to Remain in Effect. Except as waived or amended
hereby, all of the terms of the Indenture shall remain and continue in full
force and effect and are hereby confirmed in all respects.  From and after the
date of this Supplemental Indenture, all references to the Indenture (whether in
the Indenture or in any other agreements, documents or instruments) shall be
deemed to be references to the Indenture as amended and supplemented by this
Supplemental Indenture.  On the date the tenders of Notes pursuant to the
Exchange Offer are accepted for payment this Supplemental Indenture will become
operative as of the date hereof.

          SECTION 3.02.  Governing Law. THE INTERNAL LAW OF THE STATE OF NEW
YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS INDENTURE, THE NOTES AND THE
SUBSIDIARY GUARANTEES WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF
CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER
JURISDICTION WOULD BE REQUIRED THEREBY.

          SECTION 3.03.  Execution in Counterparts.  This Supplemental Indenture
may be executed in any number of counterparts, each of which shall be an
original; but such counterparts shall constitute but one and the same
instrument.

          SECTION 3.04.  Trustee Not Liable. The recitals contained herein shall
be taken as the statement of the Company, and the Trustee assumes no
responsibility whatsoever for their correctness nor for the validity or
sufficiency of this Supplemental Indenture or for the due execution hereof by
the Company.

          SECTION 3.05.  Trustee Entitled to Benefits. Subject to Article One
hereof, in entering into this Supplemental Indenture, the Trustee shall be
entitled to the benefit of every provision of the Indenture relating to the
conduct or affecting the liability of or affording protection to the Trustee,
whether or not elsewhere herein so provided.

                                       4
<PAGE>

                           (signature pages follow)

                                       5
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed all as of the date first written above.

                              AVIATION SALES COMPANY

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVIATION SALES DISTRIBUTION SERVICES COMPANY f/k/a
                              AVIATION SALES OPERATING COMPANY

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVIATION SALES LEASING COMPANY

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVIATION SALES FINANCE COMPANY

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVS/M-1, INC. f/k/a AVIATION SALES MANUFACTURING
                              COMPANY

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVS/M-2, INC. f/k/a AVS/KRATZ-WILDE MACHINE
                              COMPANY

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                                       6
<PAGE>

                              AEROCELL STRUCTURES, INC.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVS/M-3, INC. f/k/a APEX MANUFACTURING, INC.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVIATION SALES MAINTENANCE, REPAIR & OVERHAUL
                              COMPANY

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVIATION SALES PROPERTY MANAGEMENT COMPANY

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              TIMCO ENGINE CENTER, INC.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              WHITEHALL CORPORATION

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              TRIAD INTERNATIONAL MAINTENANCE CORPORATION

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                                       7
<PAGE>

                              AVS/CAI, INC. f/k/a CARIBE AVIATION, INC.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AIRCRAFT INTERIOR DESIGN, INC.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AERO HUSHKIT CORPORATION

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              HYDROSCIENCE, INC.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              TIMCO ENGINEERED SYSTEMS, INC.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVSRE, L.P.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                              AVIATION SALES SPS I, INC.

                              By:____________________________________
                              Name:__________________________________
                              Title:_________________________________

                                       8
<PAGE>

SUNTRUST BANK, as Trustee

By:______________________________
Name:____________________________
Title:___________________________

Attest:

_________________________________
Authorized Signatory

                                       9

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