Document:

Exhibit
4.13

 

 

October ___, 2006           

EXCHANGE
AGENT AGREEMENT

 

The Bank of New
York Trust Company, N.A.

2 North LaSalle Street, Suite 1020

Chicago, Illinois  60602

Attention:  Corporate Trust
Administration

Ladies and
Gentlemen:

TransDigm Inc., a Delaware
corporation (the “Company”), proposes to make an
offer (the “Exchange Offer”) to exchange all of its
outstanding and unregistered 73⁄4% Senior Subordinated Notes due 2014 (the “Old Securities”) for its registered 73⁄4% Senior Subordinated
Notes due 2014 (the “New Securities”).  The terms and conditions of the Exchange
Offer as currently contemplated are set forth in a prospectus (the “Prospectus”) included in the Company’s Registration
Statement on Form S-4 (File No. 333-       
), as amended, filed with the Securities and Exchange Commission.  The Prospectus is proposed to be distributed
to all record holders of the Old Securities. 
The Old Securities and the New Securities are collectively referred to
herein as the “Securities.”

The Company hereby
appoints The Bank of New York Trust Company, N.A. to act as exchange agent (the
“Exchange Agent”) in connection with the
Exchange Offer, and The Bank of New York Trust Company, N.A. hereby accepts
such appointment.  References hereinafter
to “you” shall refer to The Bank of New York Trust Company, N.A.

The Exchange Offer
is expected to be commenced by the Company on or about __________, 2006.  The Letter of Transmittal (the “Letter of Transmittal”) accompanying the Prospectus (or in
the case of book-entry securities, the Automated Tender Offer Program (“ATOP”) of the Book-Entry Transfer Facility (as defined
below)) is to be used by the holders of the Old Securities to accept the
Exchange Offer and contains instructions with respect to (i) the delivery
of certificates for Old Securities tendered in connection therewith and
(ii) the book-entry transfer of Securities to the Exchange Agent’s account.

The Exchange Offer
shall expire at ______ p.m., New York City time, on _________, 2006 or on such
later date or time to which the Company may extend the 

 

 

 

Exchange Offer (the “Expiration Date”).  Subject to the terms and conditions set forth
in the Prospectus, the Company expressly reserves the right to extend the
Exchange Offer from time to time and may extend the Exchange Offer by giving
oral (confirmed in writing) or written notice to you before 9:00 a.m., New York
City time, on the business day following the previously scheduled Expiration
Date.

The Company
expressly reserves the right to amend or terminate the Exchange Offer, and not
to accept for exchange any Old Securities not theretofore accepted for
exchange, upon the occurrence of any of the conditions of the Exchange Offer
specified in the Prospectus under the caption “The Exchange Offer —Conditions
to the Exchange Offer.”  The Company will
give oral (confirmed in writing) or written notice of any amendment,
termination or nonacceptance to you as promptly as practicable.

In carrying out
your duties as Exchange Agent, you are to act in accordance with the following
instructions:

                  1.       You will perform such duties and only such duties as are
specifically set forth in (i) the section of the Prospectus captioned “The
Exchange Offer” or (ii) the Letter of Transmittal, or such other duties as are specifically
set forth herein or as may be subsequently agreed to in writing by you and the
Company; provided, however, that in no way will
your general duty to act in good faith be discharged by the foregoing.

                  2.       You will establish an account with respect to the Old
Securities at The Depository Trust Company (the “Book-Entry
Transfer Facility”) for purposes of the Exchange Offer within two
business days after the date of the Prospectus, and any financial institution
that is a participant in the Book-Entry Transfer Facility’s systems may
make book-entry delivery to you of the Old Securities by causing the Book-Entry
Transfer Facility to transfer such Old Securities into your account in
accordance with the Book-Entry Transfer Facility’s procedure for such
transfer.

                  3.       You are to examine each of the Letters of Transmittal and
certificates for Old Securities (or confirmation of book-entry transfer
into your account at the Book-Entry Transfer Facility) and any other
documents delivered or mailed to you by or for holders of the Old Securities to
ascertain whether: (i) the Letters of Transmittal and any such other documents
are duly executed and properly completed in accordance with the instructions
set forth therein; and (ii) the Old Securities have otherwise been properly
tendered.  In each case where the Letter
of Transmittal or any other document has been improperly completed or executed
or any of the certificates for Old Securities are not in proper form for
transfer or some other irregularity in connection with the acceptance of the
Exchange Offer exists, you will endeavor to inform the presenters of the need
for fulfillment of all requirements and to take any other action as may be
reasonably necessary or advisable to cause such irregularity to be corrected.

 

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                  4.       With the approval of the Chief Executive Officer, the President
or the Chief Financial Officer of the Company (such approval, if given orally,
to be confirmed in writing) or any other party designated by such an officer in
writing (each, a “Designated Officer”), you are
authorized to waive any irregularities in connection with any tender of Old
Securities pursuant to the Exchange Offer.

                  5.       Tenders of Old Securities may be made only as set forth in the
Letter of Transmittal and in the section of the Prospectus captioned “The
Exchange Offer—How to Tender,” and Old Securities shall be considered properly
tendered to you only when tendered in accordance with the procedures set forth
therein.

Notwithstanding
the provisions of this Paragraph 5, Old Securities which any Designated
Officer shall approve as having been properly tendered shall be considered to
be properly tendered (such approval, if given orally, shall be confirmed in
writing).

                  6.       You shall advise the Company with respect to any Old
Securities received subsequent to the Expiration Date and accept its
instructions with respect to disposition of such Old Securities.

                  7.       You shall accept tenders:

                   (1)        in cases where the Old Securities are registered in two or
more names only if signed by all named holders;

                   (2)        in cases where the signing person (as indicated on the Letter
of Transmittal) is acting in a fiduciary or a representative capacity only when
proper evidence of his or her authority so to act is submitted; and

                   (3)        from persons other than the registered holder of Old
Securities, provided that customary transfer
requirements, including payment of any applicable transfer taxes, are
fulfilled.

You shall accept
partial tenders of Old Securities where so indicated and as permitted in the
Letter of Transmittal and deliver certificates for Old Securities to the
transfer agent for split-up and return any untendered Old Securities to
the holder (or such other person as may be designated in the Letter of
Transmittal) as promptly as practicable after expiration or termination of the
Exchange Offer.

                  8.       Upon satisfaction or waiver of all of the conditions to the
Exchange Offer, the Company will notify you (such notice, if given orally, to
be confirmed in writing) of its acceptance, promptly after the Expiration Date,
of all Old Securities properly tendered and you, on behalf of the Company, will
exchange such Old Securities for New Securities and cause such Old Securities
to be cancelled.  Delivery of New
Securities will be made 

 

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on behalf of the
Company by you at the rate of $1,000 principal amount of New Securities for
each $1,000 principal amount of Old Securities tendered promptly after notice
(such notice, if given orally, to be confirmed in writing) of acceptance of
said Old Securities by the Company; provided, however, that
in all cases, Old Securities tendered pursuant to the Exchange Offer will be
exchanged only after timely receipt by you of certificates for such Old Securities
(or confirmation of book-entry transfer into your account at the Book-Entry
Transfer Facility), a properly completed and duly executed Letter of
Transmittal (or facsimile thereof or delivery of an agent’s message (as defined
in the Prospectus) in lieu thereof) with any required signature guarantees and
any other required documents.  You shall
issue New Securities only in denominations of $1,000 or any integral multiple
thereof.

                  9.       Tenders pursuant to the Exchange Offer are irrevocable, except
that, subject to the terms and upon the conditions set forth in the Prospectus
and the Letter of Transmittal, Old Securities tendered pursuant to the Exchange
Offer may be withdrawn at any time prior to the Expiration Date.

                10.       The Company shall not be required to exchange any Old
Securities tendered if any of the conditions set forth in the Exchange Offer
are not met.  Notice of any decision by
the Company not to exchange any Old Securities tendered shall be given (and confirmed
in writing if the original notice was given orally) by the Company to you.

                11.       If, pursuant to the Exchange Offer, the Company does not
accept for exchange all or part of the Old Securities tendered because of an
invalid tender, the occurrence of certain other events set forth in the Prospectus
under the caption “The Exchange Offer —Conditions to the Exchange Offer” or
otherwise, you shall as soon as practicable after the expiration or termination
of the Exchange Offer return those certificates for unaccepted Old Securities
(or effect appropriate book-entry transfer), together with any related
required documents and the Letters of Transmittal relating thereto that are in
your possession, to the persons who deposited them.

                12.       All certificates for reissued Old Securities, unaccepted Old
Securities or for New Securities shall be forwarded by (a) first-class
certified mail, return receipt requested, under a blanket surety bond
protecting you and the Company from loss or liability arising out of the non-receipt
or non-delivery of such certificates, (b) by registered mail insured
separately for the replacement value of such securities, or (c) by appropriate
book-entry transfer.

                13.       You are not authorized to pay or offer to pay any concessions,
commissions or solicitation fees to any broker, dealer, bank or other persons
or to engage or utilize any person to solicit tenders.

 

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                14.       As Exchange Agent hereunder you:

                   (1)        shall have no duties or obligations other than as
specifically set forth in the section of the Prospectus captioned “The Exchange
Offer” or in the Letter of Transmittal, or as specifically set forth herein or
as may be subsequently agreed to in writing by you and the Company; provided, however, that in no way will your general duty to
act in good faith be discharged by the foregoing;

                   (2)        will be regarded as making no representations and having no
responsibilities as to the validity, sufficiency, value or genuineness of any
of the certificates or the Old Securities represented thereby deposited with
you pursuant to the Exchange Offer, and will not be required to and will make
no representation as to the validity, value or genuineness of the Exchange
Offer;

                   (3)        shall not be obligated to take any legal action hereunder
which might in your reasonable judgment involve any expense or liability,
unless you shall have been furnished with reasonable indemnity;

                   (4)        may reasonably rely on and shall be protected in acting in
reliance upon any certificate, instrument, opinion, notice, letter, telegram or
other document or security delivered to you and reasonably believed by you to
be genuine and to have been signed or presented by the proper party or parties;

                   (5)        may reasonably act upon any tender, statement, request,
document, agreement, certificate or other instrument whatsoever not only as to
its due execution and validity and effectiveness of its provisions, but also as
to the truth and accuracy of any information contained therein, which you shall
in good faith believe to be genuine or to have been signed or presented by the
proper person or persons;

                   (6)        may rely on and shall be protected in acting upon written or
oral instructions from any Designated Officer of the Company;

                   (7)        may consult with your counsel with respect to any questions relating
to your duties and responsibilities and the reasonable advice or opinion of
such counsel shall be full and complete authorization and protection in respect
of any action taken, suffered or omitted to be taken by you hereunder in good
faith and in accordance with the reasonable advice or opinion of such counsel;
and

                   (8)        shall not advise any person tendering Old Securities pursuant
to the Exchange Offer as to the wisdom of making such tender or as to the
market value or decline or appreciation in market value of any Old Securities.

 

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                15.       You shall take such action as may from time to time be
requested by the Company or its counsel (and such other action as you may
reasonably deem appropriate) to furnish copies of the Prospectus, Letter of
Transmittal and the Notice of Guaranteed Delivery which accompanies the
Prospectus (the “Notice of Guaranteed Delivery”)
or such other forms as may be approved from time to time by the Company, to all
persons requesting such documents and to accept and comply with telephone
requests for information relating to the Exchange Offer, provided that such
information shall relate only to the procedures for accepting (or withdrawing
from) the Exchange Offer.  The Company
will furnish you with copies of such documents on your request.  All other requests for information relating
to the Exchange Offer shall be directed to the Company, Attention:  Chief Financial Officer.

                16.       You shall advise by facsimile transmission or e-mail to Sean
Maroney, Director of Corporate Accounting of the Company (facsimile number -
216-706-2937; email address — smaroney@transdigm.com), and such other person or
persons as the Company may request, daily (and more frequently during the week
immediately preceding the Expiration Date and if otherwise requested) up to and
including the Expiration Date, as to the number of Old Securities which have
been tendered pursuant to the Exchange Offer and the items received by you
pursuant to this Agreement, separately reporting and giving cumulative totals
as to items properly received and items improperly received.  In addition, you will also inform, and
cooperate in making available to, the Company, its counsel or any such other
person or persons upon oral request made from time to time prior to the
Expiration Date of such other information as it or he or she reasonably
requests.  Such cooperation shall
include, without limitation, the granting by you to the Company and such persons
as the Company may request of access to those persons on your staff who are
responsible for receiving tenders, in order to ensure that immediately prior to
the Expiration Date the Company shall have received information in sufficient
detail to enable it to decide whether to extend the Exchange Offer.  You shall prepare a final list of all persons
whose tenders were accepted, the aggregate principal amount of Old Securities
tendered, the aggregate principal amount of Old Securities accepted and deliver
said list to the Company promptly after the Expiration Date.

                17.       Letters of Transmittal and Notices of Guaranteed Delivery
shall be stamped by you as to the date and the time of receipt thereof and
shall be preserved by you for a period of time at least equal to the period of
time you preserve other records pertaining to the transfer of securities.  You shall dispose of unused Letters of
Transmittal and other surplus materials by returning them to the Company.

                18.       You hereby expressly waive any lien, encumbrance or right of
set-off whatsoever that you may have with respect to funds deposited with
you for the payment of transfer taxes by reasons of amounts, if any, borrowed
by the Company, or any of its subsidiaries or affiliates pursuant to any loan
or credit agreement with you or for compensation owed to you hereunder.

 

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                19.       For services rendered as Exchange Agent hereunder, you shall
be entitled to such compensation as set forth on Schedule I attached hereto
plus reasonable out-of-pocket expenses and reasonable legal counsel
fees.

                20.       You hereby acknowledge receipt of the Prospectus and the
Letter of Transmittal and further acknowledge that you have examined each of
them.  Any inconsistency between this
Agreement, on the one hand, and the Prospectus and the Letter of Transmittal
(as they may be amended from time to time), on the other hand, shall be
resolved in favor of the latter two documents, except with respect to the
duties, liabilities and indemnification of you, as Exchange Agent, which shall
be controlled by this Agreement.

                21.       The Company covenants and agrees to indemnify, defend and hold
you harmless in your capacity as Exchange Agent hereunder against any loss,
liability, cost or expense, including reasonable attorneys’ fees and expenses,
arising out of or in connection with any act, omission, delay or refusal made
by you hereunder in reliance upon any signature, endorsement, assignment,
certificate, order, request, notice, instruction or other instrument or
document reasonably believed by you to be valid, genuine and sufficient and in
accepting any tender or effecting any transfer of Old Securities reasonably
believed by you in good faith to be authorized, and in delaying or refusing in
good faith to accept any tenders or effect any transfer of Old Securities; provided, however, that the Company shall not be liable for
indemnification or otherwise for any loss, liability, cost or expense to the
extent arising out of your negligence or willful misconduct.  In no case shall the Company be liable under
this indemnity with respect to any claim against you unless the Company shall
be notified by you, by letter or by facsimile transmission confirmed in
writing, of the written assertion of a claim against you or of any other action
commenced against you, promptly after you shall have received any such written
assertion or notice of commencement of action. 
The Company shall be entitled to participate at its own expense in the
defense of any such claim or other action and, if the Company so elects, the
Company shall assume the defense of any suit brought to enforce any such
claim.  In the event that the Company
shall assume the defense of any such suit, the Company shall not thereafter be
liable for the fees and expenses of any counsel retained by you so long as you
consent to the Company’s retention of counsel, which consent may not be
unreasonably withheld; it being understood that if there is a conflict of
interest, the Company shall be required to pay for separate counsel for
you.  It is understood that the Company
shall not be liable under this paragraph for the fees and expenses of more than
one legal counsel for you at any one particular time (plus any local counsel
required).  You agree that, without the
prior written consent of the Company (which consent shall not be unreasonably
withheld), you will not settle, compromise or consent to the entry of any judgment
in respect of any pending or threatened claim, action or proceeding in respect
of which indemnification could be sought in accordance with the indemnification
provisions of this Agreement (whether or not you or the Company is an actual or
potential party to such claim, action 

 

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or proceeding),
unless such settlement, compromise or consent includes an unconditional release
of the Company from all liability arising out of such claim, action or
proceeding.

                22.       You shall arrange to comply with all requirements under the
tax laws of the United States, including those relating to missing Tax
Identification Numbers, and shall file any appropriate reports with the
Internal Revenue Service.  The Company
understands that you are required to deduct 31% on payments to holders who have
not supplied their correct Taxpayer Identification Number or required
certification.  Such funds will be turned
over to the Internal Revenue Service in accordance with applicable regulations.

                23.       You shall deliver or cause to be delivered, in a timely manner
to each governmental authority to which any transfer taxes are payable in
respect of the exchange of Old Securities, your check in the amount of all
transfer taxes so payable, and the Company shall reimburse you for the amount
of any and all transfer taxes payable in respect of the exchange of Old
Securities; provided, however, that you shall
reimburse the Company for amounts refunded to you in respect of your payment of
any such transfer taxes, at such time as such refund is received by you.

                24.       This Agreement and your appointment as Exchange Agent
hereunder shall be construed and enforced in accordance with the laws of the
State of New York applicable to agreements made and to be performed entirely
within such state, and without regard to conflicts of law principles, and shall
inure to the benefit of, and the obligations created hereby shall be binding
upon, the successors and assigns of each of the parties hereto.

                25.       This Agreement may be executed in two or more counterparts,
each of which shall be deemed to be an original and all of which taken together
shall constitute one and the same agreement.

                26.       In case any provision of this Agreement shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

                27.       This Agreement shall not be deemed or construed to be
modified, amended, rescinded, cancelled or waived, in whole or in part, except
by a written instrument signed, in the case of a modification, amendment,
attempt to rescind or cancellation, each of the parties hereto, and in the case
of a waiver, by a duly authorized representative of the party to be
charged.  This Agreement may not be
modified orally.

                28.       Unless otherwise provided herein, all notices, requests and
other communications to any party hereunder shall be in writing (including
facsimile or similar 

 

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writing) and shall
be given to such party, addressed to it, at its address or telecopy number set
forth below:

 

If to the Company:

                                                TransDigm
Inc.
                                                1301 East 9th Street,
Suite 3710
                                                Cleveland,
Ohio 44114
                                                Facsimile:  216-706-2937
                                                Attention:  Chief Financial Officer

 

with a copy to:

                                                Willkie
Farr & Gallagher LLP
                                                787
Seventh Avenue
                                                New
York, New York 10019
                                                Facsimile:  212-728-8111
                                                Attention:  Cristopher Greer, Esq.

If to the Exchange Agent:

                                                The
Bank of New York Trust Company, N.A.
                                                2
North LaSalle Street
                                                Chicago,
Illinois  60602
                                                Facsimile:  (312) 827-8542
                                                Attention:  Corporate Trust Administration

                29.       Unless terminated earlier by the parties hereto, this
Agreement shall terminate 90 days following the Expiration Date.
Notwithstanding the foregoing, Paragraphs 19, 21 and 23 shall survive the
termination of this Agreement.  Upon any
termination of this Agreement, you shall promptly deliver to the Company any
certificates for Securities, funds or property then held by you as Exchange
Agent under this Agreement.

                30.       This Agreement shall be binding and effective as of the date
hereof.

 

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Please acknowledge
receipt of this Exchange Agent Agreement and confirm the arrangements herein
provided by signing and returning the enclosed copy.

 

	
   

  	
  TRANSDIGM INC.

  
	
   

  	
   

  
	
   

  	
  By:______________________________

  
	
   

  	
  Name:

  
	
   

  	
  Title:

  

Accepted as of the date

first above written:

The Bank of New York Trust Company, N.A.,
   as Exchange Agent

By:_______________________

Name:

Title:

 

 

10

 

SCHEDULE
I

 

	
  Administration
  fee

  	
   

  	
  $7,500.00

  	
   

  
	
  Extensions of Offer (per Extension)

  	
   

  	
  $1,000.00

  	
   

  
	
  Midnight expiration of Offer

  	
   

  	
  $1,500.00QuickLinks
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Exhibit 10.21    
    

[ORANGE COUNTY BUSINESS BANK LOGO]  

June 19, 2006 

Roy
L. Gill, Vice President

The Willdan Group of Companies

2401 East Katella Avenue, Suite #300

Anaheim, CA 92660 

Re:    Borrower:
The Willdan Group of Companies, a California Corporation 

Dear
Mr. Gill: 

        In
response to your letter dated March 29, 2006, Orange County Business Bank has approved the following amendments to the loan documents that pertain to Loan #10174420 and Loan
#10274428. 

	1.
	Borrower's
annual CPA unqualified audited financial statements as available and in no event later than two hundred and ten (210) days after fiscal year ending December 31, 2005
only, reverting to previous covenant thereafter. Said financial statements shall be the consolidated statements of all Willdan Group of Companies including but not limited to all corporate guarantors
of herein described credit facilities.

	2.
	Borrower
may change its state of incorporation to Delaware from California. Borrower must file all appropriate forms to affect this change as required by the State of Delaware and the
State of California.

	3.
	Although
the borrower may proceed with the due diligence associated with the transfer of its assets and liabilities to the new entity known as Willdan Group, Inc., prior to this
proposed transfer, Orange County Business Bank is to be in receipt of all appropriate formation and operating documents from which new loan documents evidencing this transaction are to be executed by
all parties. 

        In
addition, in response to your letter dated June 8, 2006, Orange County Business Bank has approved the company's "zero value" stock dividend/stock split which was instituted on
January 1, 2005 and completed on March 30, 2006. Please let us know if you have any questions. Thank you. 

	Sincerely,	 	 
	

/s/  NIC GOERES      
 Nic Goeres

Vice President

Senior Relationship Manager

(949) 999-2643	
 	

/s/  CHUCK TULLOH      
 Chuck Tulloh

Executive Vice President

Chief Credit Officer

(949) 999-3556

QuickLinks

Exhibit 10.21

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