Document:

<PAGE>

                                                                     EXHIBIT 4.2

                                                                  Execution Copy

                                  June 23, 2004

Northrop Grumman Space & Mission Systems Corp.
1840 Century Park East
Los Angeles, California 90067
Attn: Vice President and General Counsel

To whom it may concern:

            We refer to the Seller Subordinated Note dated as February 28, 2003
(the "Original Seller Note") issued to Richmond TASSI Inc. (f/k/a TRW Automotive
Safety Systems Inc.) by TRW Automotive Intermediate Holdings Corp. (the
"Company"), which Original Seller Note was transferred to Northrop Grumman Space
and Mission Systems Corp. ("NGS" or the "Holder") pursuant to a consent dated
December 22, 2003 among Richmond TASSI Inc., NGS and the Company. Capitalized
terms used herein and not otherwise defined are used herein as defined therein.
This letter shall confirm our understanding and agreement with respect to
certain amendments to the Original Seller Note and certain other matters in
connection therewith.

            1. Amendment to Note

            The Original Seller Note shall be cancelled and replaced by an
amended and restated version thereof in the form set forth in Exhibit A hereto
(the "Amended and Restated Seller Note"). The Holder acknowledges and agrees
that the financial statements referred to in Section 4.3 of the Amended and
Restated Note shall not be required to be prepared in compliance with the rules
and regulations of the U.S. Securities and Exchange Commission.

            2. Management Support

            In connection with efforts by the Holder to assign all or any
portion of the Amended and Restated Seller Note in accordance with Section 10.1
thereof and in compliance with applicable exemptions under the Securities Act of
1933, as amended, and any applicable state securities laws, the Company hereby
agrees that it will arrange for reasonable senior management assistance with a
limited number of investor conference calls and calls with rating agencies in
connection with the initial marketing of the Amended and Restated Seller Note
over a period of three months commencing on the date of a written request to the
Company for such assistance (the "Request Date"); provided that, if the Request
Date occurs on or after the date which is six months after the date hereof, the
Company's obligation to arrange for such assistance shall be subject to there
not being at such time any plans or arrangements by the Company or any of its
affiliates to market or sell any securities the marketing or sale of which could
be adversely affected by the assignment of the Amended and Restated Seller Note
at such time, in which event the Company's obligations hereunder shall be
suspended until the marketing and sale of such other securities is completed or
abandoned.

            The Holder agrees to reimburse the Company promptly upon request for
all of the Company's out-of-pocket fees and expenses associated with the support
being rendered by the Company and its affiliates and their respective directors,
officers or employees pursuant to this letter agreement.

<PAGE>

                                                                               2

            3. Financial Statement Fee

            The Company agrees to provide the Holder with an unaudited balance
sheet and income statement for the Company as of and for the fiscal year ended
December 31, 2003, in each case without footnote disclosures, as soon as
reasonably practical. In consideration for the Company's commitment to furnish
the financial statements set forth in Section 4.3(a) of the Amended and Restated
Seller Note, the Holder hereby agrees to pay to the Company a fee of $1 million
by wire transfer within ten business days of the date on which Holder requests
the Company to commence preparation of the financial statements; provided,
however, that, in the event that the Amended and Restated Seller Note is
redeemed in full prior to the stated maturity thereof, the Company shall
reimburse NGS an amount, if any, equal to $1 million multiplied by the remainder
of (x) one minus (y) the fraction whose numerator is the year in which such
redemption occurs minus the year in which Seller's request to commence
preparation of financial statements and whose denominator is fourteen.

            This letter agreement may not be assigned by operation of law or
otherwise without the express prior written consent of the other party hereto.
This letter agreement may not be amended or modified except by an instrument in
writing signed by each of the parties to this letter agreement.

            This letter agreement shall be governed by and construed in
accordance with the laws of the State of New York. The parties hereto
irrevocably submit to the exclusive jurisdiction of any federal or state court
in the Borough of Manhattan, New York, New York, United States of America, in
any suit or proceeding based on or arising under this letter agreement, and
irrevocably agree that any and all claims in respect of such suit or proceeding
shall be brought or otherwise commenced in and may be determined in any such
court. To the fullest extent permitted by applicable laws and subject to the
preceding sentence, each party hereto: (i) expressly and irrevocably consents
and submits to the jurisdiction of each such court in connection with any such
legal proceeding; (ii) irrevocably consents to service of process in any such
proceeding in any manner permitted by New York law and agrees that service of
process by registered or certified mail, return receipt requested, at its
address herein is reasonably calculated to give actual notice; (iii) irrevocably
agrees that each federal and state court located in any federal or state court
in the Borough of Manhattan, New York, New York, shall be deemed to be a
convenient forum; and (iv) irrevocably waives and agrees not to assert (by way
of motion, as a defense or otherwise) in any such legal proceeding commenced in
any federal or state court in the Borough of Manhattan, New York, New York, any
claim that such party is not subject personally to the jurisdiction of such
court, that such legal proceeding has been brought in an inconvenient forum,
that the venue of such proceeding is improper or that this Agreement or the
subject matter hereof may not be enforced in any such court.

<PAGE>

                                                                               3

            In order to confirm our mutual agreement as set forth in this letter
agreement, please sign this letter agreement in the space provided below and
return it to us, whereupon it shall constitute our binding agreement with
respect to the subject matter hereof. This letter agreement may be executed in
counterparts.

                                        Very truly yours,

                                        TRW AUTOMOTIVE INTERMEDIATE
                                        HOLDINGS CORP.

                                        By: /s/ David L. Bialosky
                                            ------------------------------------
                                            Name: David L. Bialosky
                                            Title: Secretary

<PAGE>

                                                                               4

Accepted and agreed as of the
date hereof:

RICHMOND TASSI INC.

By: /s/ James L. Sanford
    -----------------------------------
    Name: James L. Sanford
    Title: Treasurer

NORTHROP GRUMMAN SPACE & MISSION SYSTEMS CORP.

By: /s/ James L. Sanford
    -----------------------------------
    Name: James L. Sanford
    Title: Treasurer<PAGE>

                                                                    EXHIBIT 10.1

                                                                  EXECUTION COPY

                        AMENDMENT No. 1 dated as of May 6, 2004 (this
                  "Amendment"), to the SECOND AMENDED AND RESTATED CREDIT
                  AGREEMENT (the "Credit Agreement") dated as of January 9,
                  2004, among TRW AUTOMOTIVE HOLDINGS CORP. ("Holdings"), TRW
                  AUTOMOTIVE INTERMEDIATE HOLDINGS CORP. ("Intermediate
                  Holdings"), TRW AUTOMOTIVE INC. (f/k/a TRW AUTOMOTIVE
                  ACQUISITION CORP.) (the "U.S. Borrower"), the FOREIGN
                  SUBSIDIARY BORROWERS party thereto (collectively, the "Foreign
                  Subsidiary Borrowers" and, together with the U.S. Borrower,
                  the "Borrowers"), the LENDERS party thereto, JPMORGAN CHASE
                  BANK, as Administrative Agent (in such capacity, the
                  "Administrative Agent"), CREDIT SUISSE FIRST BOSTON, LEHMAN
                  COMMERCIAL PAPER INC. and DEUTSCHE BANK SECURITIES INC., as
                  Co-Syndication Agents, and BANK OF AMERICA N.A., as
                  Documentation Agent.

            A. Pursuant to the Credit Agreement, the Lenders have extended
credit to the Borrowers, and have agreed to extend credit to the Borrowers, in
each case pursuant to the terms and subject to the conditions set forth therein.

            B. The Borrowers have requested that the Lenders agree to amend
certain provisions of the Credit Agreement as set forth herein.

            C. The undersigned Lenders are willing so to amend the Credit
Agreement, pursuant to the terms and subject to the conditions set forth herein.

            D. Capitalized terms used and not otherwise defined herein shall
have the meanings assigned thereto in the Credit Agreement.

            SECTION 1. Amendments to Section 5.04. (a) Clauses (a) and (b) of
Section 5.04 of the Credit Agreement are hereby amended by replacing the
semi-colon at the end of each such clause with the character ")" and by
inserting the following text immediately thereafter:

            ; provided that, in the event that (i) either Holdings or
            Intermediate Holdings becomes subject to the reporting requirements
            of Section 13 or 15(d) of the Securities Exchange Act of 1934, as
            amended, and (ii) Holdings or Intermediate Holdings, as applicable,
            is not engaged in any business or business activity other than that
            which is expressly permitted under Section 6.08, this clause may be
            satisfied by the provision of consolidated financial statements of
            Holdings or Intermediate Holdings, as applicable, in a manner
            consistent with the other requirements of

<PAGE>

                                                                               2

            this clause, and all references to the U.S. Borrower in this clause
            shall instead be deemed to be references to Holdings or Intermediate
            Holdings, as applicable;

            (b) Clause (e) of Section 5.04 of the Credit Agreement is hereby
amended by (i) deleting the text "of the U.S. Borrower and the Subsidiaries"
therein and (ii) replacing the text "Holdings and the U.S. Borrower" therein
with the text "Holdings, Intermediate Holdings or the U.S. Borrower, as
applicable,".

            SECTION 2. Representations and Warranties. Each of Holdings,
Intermediate Holdings and the Borrowers represents and warrants to the
Administrative Agent and to each of the Lenders that:

            (a) this Amendment has been duly authorized, executed and delivered
by each of Holdings, Intermediate Holdings and the Borrowers and constitutes a
legal, valid and binding obligation of each of Holdings, Intermediate Holdings
and the Borrowers, enforceable against each of Holdings, Intermediate Holdings
and the Borrowers in accordance with its terms;

            (b) after giving effect to this Amendment, the representations and
warranties set forth in Article III of the Credit Agreement are true and correct
in all material respects on and as of the date hereof with the same effect as if
made on and as of the date hereof, except to the extent such representations and
warranties expressly relate to an earlier date; and

            (c) after giving effect to this Amendment, no Default has occurred
and is continuing.

            SECTION 3. Conditions to Effectiveness. This Amendment shall become
effective when (a) the Administrative Agent shall have received counterparts of
this Amendment that, when taken together, bear the signatures of Holdings,
Intermediate Holdings, the Borrowers and the Required Lenders, (b) the
representations and warranties set forth in Section 2 hereof are true and
correct (as set forth on an officer's certificate delivered to the
Administrative Agent) and (c) all invoiced fees and expenses required to be paid
or reimbursed by Holdings, Intermediate Holdings and the Borrowers pursuant
hereto or the Credit Agreement or otherwise, including all invoiced fees and
expenses of counsel to the Administrative Agent, shall have been paid or
reimbursed, as applicable.

            SECTION 4. Credit Agreement. Except as specifically amended hereby,
the Credit Agreement shall continue in full force and effect in accordance with
the provisions thereof as in existence on the date hereof. After the date
hereof, any reference to the Credit Agreement shall mean the Credit Agreement as
amended hereby. This Amendment shall be a Loan Document for all purposes.

            SECTION 5. APPLICABLE LAW. THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

<PAGE>

                                                                               3

            SECTION 6. Counterparts. This Amendment may be executed in two or
more counterparts, each of which shall constitute an original but all of which
when taken together shall constitute but one agreement. Delivery of an executed
signature page to this Amendment by facsimile transmission shall be effective as
delivery of a manually signed counterpart of this Amendment.

            SECTION 7. Expenses. Each of the Holdings, Intermediate Holdings and
the Borrowers agrees to reimburse the Administrative Agent for out-of-pocket
expenses in connection with this Amendment, including the fees, charges and
disbursements of Cravath, Swaine & Moore LLP, counsel for the Administrative
Agent.

            SECTION 8. Headings. The headings of this Amendment are for purposes
of reference only and shall not limit or otherwise affect the meaning hereof.

<PAGE>

            IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed by their respective authorized officers as of the day and year
first written above.

                                           TRW AUTOMOTIVE HOLDINGS CORP.,

                                             by /s/ Peter R. Rapin
                                                --------------------------------
                                                Name:  Peter R. Rapin
                                                Title: Treasurer

                                           TRW AUTOMOTIVE INTERMEDIATE
                                           HOLDINGS CORP.,

                                             by /s/ Joseph S. Cantie
                                                --------------------------------
                                                Name:  Joseph S. Cantie
                                                Title: Chief Financial Officer

                                           TRW AUTOMOTIVE INC.,

                                             by /s/ Peter R. Rapin
                                                --------------------------------
                                                Name:  Peter R. Rapin
                                                Title: Treasurer

                                           LUCAS INDUSTRIES LIMITED,

                                             by /s/ Graham T. Plumley
                                                --------------------------------
                                                Name:  Graham T. Plumley
                                                Title: Director

                                           TRW SYSTEMS LIMITED,

                                             by /s/ Graham T. Plumley
                                                --------------------------------
                                                Name:  Graham T. Plumley
                                                Title: Director

                                           TRW BRAKING SYSTEMS POLAND
                                           SP.Z.O.O.,

                                             by /s/ Mike Charlton
                                                -------------------------------
                                                Name:  Mike Charlton
                                                Title: Director

<PAGE>

                                           TRW POLSKA SP.Z.O.O.,

                                             by /s/ Guenter Brenner
                                                --------------------------------
                                                Name:  Guenter Brenner
                                                Title: VP Operations, OSS Europe

                                           TRW SAFETY SYSTEMS POLAND SP.Z.O.O.,

                                             by /s/ Guenter Brenner
                                                --------------------------------
                                                Name:  Guenter Brenner
                                                Title: VP Operations, OSS Europe

                                           TRW STEERING SYSTEMS POLAND
                                           SP.Z.O.O.,

                                             by /s/ Graham T. Plumley
                                                --------------------------------
                                                Name:  Graham T. Plumley
                                                Title: Director

                                           TRW AUTOMOTIVE GMBH,

                                             by /s/ Reinhard Lechner
                                                --------------------------------
                                                Name:  Reinhard Lechner
                                                Title: Director

                                           TRW DEUTSCHLAND HOLDINGS
                                           GMBH,

                                             by /s/ Reinhard Lechner
                                                --------------------------------
                                                Name:  Reinhard Lechner
                                                Title: Director

<PAGE>

                                                               SIGNATURE PAGE TO
                                                     AMENDMENT NO. 1 DATED AS OF
                                                                     May 6, 2004

To Approve the Amendment:

By: *
    -------------------------------------------

* EXECUTED BY THE REQUISITE NUMBER OF LENDERS

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00069-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00069-of-00352.parquet"}]]