UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): February 14, 2011

TRANSDIGM GROUP INCORPORATED

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (216) 706-2960

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

New Senior Secured Credit Facility and Guarantee and Collateral Agreement

On February 14, 2011, TransDigm Inc. (“TransDigm”), a wholly-owned subsidiary of TransDigm Group Incorporated (“TD Group”), TD Group and the subsidiaries of TransDigm named therein entered into a (i) Credit Agreement with Credit Suisse AG, as administrative agent and collateral agent, and the other agents and lenders named therein (the “New Senior Secured Credit Facility”) and (ii) an amendment and restatement of the Guarantee and Collateral Agreement, dated as of June 23, 2006, as amended and restated as of December 6, 2010, with Credit Suisse AG, as administrative agent and collateral agent (the “Guarantee and Collateral Agreement”).

TransDigm is the borrower under the New Senior Secured Credit Facility, which provides for a $1,550 million term loan facility, which was fully drawn on February 14, 2011. The proceeds of the term loan were used to repay in full the outstanding term loans under the Credit Agreement, dated as of December 6, 2010, among TransDigm, TD Group, the subsidiaries of TransDigm named therein, Credit Suisse AG, as administrative agent and collateral agent, and the other agents and lenders named therein (the “Existing Senior Secured Credit Facility”) and the related transaction expenses associated therewith. Under the terms of the New Senior Secured Credit Facility, TransDigm is entitled on one or more occasions, subject to the satisfaction of certain conditions, to request additional term loans under the New Senior Secured Credit Facility in the aggregate principal amount of up to $500 million (less any increase in the commitments under the revolving credit facility and/or additional term loans under the term loan facility under the Existing Senior Secured Credit Facility) to the extent that existing or new lenders agree to provide such additional term loans. All of the indebtedness outstanding under the New Senior Secured Credit Facility is guaranteed by TD Group and all of TransDigm’s current and future domestic restricted subsidiaries (other than immaterial subsidiaries). In addition, pursuant to the terms of the Guarantee and Collateral Agreement, the obligations of TransDigm and the guarantors under the New Senior Secured Credit Facility are secured ratably in accordance with each lender’s respective term loan commitments by a first priority security interest in substantially all of the existing and future property and assets, including inventory, equipment, general intangibles, intellectual property, investment property and other personal property (but excluding leasehold interests and certain other assets) of TransDigm and its existing and future domestic restricted subsidiaries (other than immaterial subsidiaries), and a first priority pledge of the capital stock of TransDigm and its subsidiaries (other than foreign subsidiaries) and 65% of the voting capital stock of TransDigm’s foreign subsidiaries.

The interest rates per annum applicable to the term loans under the New Senior Secured Credit Facility will be, at TransDigm’s option, equal to either an alternate base rate or an adjusted LIBO rate for one, two, three or six-month (or to the extent agreed to by each relevant lender, nine or twelve-month) interest periods chosen by TransDigm, in each case plus an applicable margin percentage.

The alternate base rate will be the greater of (i) 2.00%, (ii) Credit Suisse AG’s prime rate, (iii) 50 basis points over the weighted average of rates on overnight Federal funds as published by the Federal Reserve Bank of New York, and (iv) the adjusted LIBO rate with a maturity of three months plus 1.00%. The LIBO rate will be determined by reference to settlement rates established for deposits in dollars in the London interbank market for a period equal to the interest period of the loan as adjusted for the maximum reserve percentages established by the Board of Governors of the United States Federal Reserve. The adjusted LIBO rate will be the greater of (i) 1.00% and (ii) the rate obtained by dividing (x) the LIBO Rate by (y) a percentage equal to 1 minus the stated maximum rate (stated as a decimal) of all reserves, if any, required to be maintained against “Eurocurrency liabilities” as specified in Regulation D (including any marginal, emergency, special or supplemental reserves).

The applicable margin percentage is a percentage per annum equal to 2.00% with respect to alternate base rate term loans and 3.00% with respect to adjusted LIBO rate term loans.

The term loan facility under the New Senior Secured Credit Facility matures on February 14, 2017. The term loan facility under the New Senior Secured Credit Facility requires quarterly principal payments beginning March 31, 2011. The term loan facility requires mandatory prepayments of principal based on certain percentages of Excess Cash Flow (as therein defined), commencing 90 days after the end of each fiscal year, commencing with the fiscal year ending September 30, 2012, subject to certain exceptions. In addition, subject to certain exceptions (including, with respect to asset sales, the reinvestment in productive assets), TransDigm will be required to prepay

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the loans outstanding under the term loan facility at 100% of the principal amount thereof, plus accrued and unpaid interest, with the net cash proceeds of certain asset sales and issuance or incurrence of certain indebtedness. In addition, if, prior to February 14, 2012, the principal amount of the term loans are (i) prepaid substantially concurrently with the incurrence by TD Group, TransDigm or any its subsidiaries of new bank loans that have an effective yield lower than the yield in effect on the term loans so prepaid or (ii) received by a lender due to a mandatory assignment following the failure of such lender to consent to an amendment of the New Senior Secured Credit Facility that has the effect of reducing the effective interest rate with respect to the term loans, such prepayment or receipt shall be accompanied by a premium of 1.0%.

The New Senior Secured Credit Facility contains certain covenants that limit the ability of TD Group, TransDigm and TransDigm’s restricted subsidiaries to, among other things: (i) incur or guarantee additional indebtedness or issue preferred stock; (ii) pay distributions on, redeem or repurchase capital stock or redeem or repurchase subordinated debt; (iii) make investments; (iv) sell assets; (v) enter into agreements that restrict distributions or other payments from restricted subsidiaries to TransDigm; (vi) incur or suffer to exist liens securing indebtedness; (vii) consolidate, merge or transfer all or substantially all of their assets; and (viii) engage in transactions with affiliates.

The New Senior Secured Credit Facility contains customary events of default including, without limitation, the representations and warranties made in or in connection with the loan documents entered into in connection with the New Senior Secured Credit Facility prove to have been false or misleading in any material respect when made, the failure to make required payments, failure to comply with certain agreements or covenants, cross-defaults to certain other indebtedness in excess of specified amounts, certain events of bankruptcy and insolvency, failure to pay certain judgments and a Change of Control (as defined therein). If such an event of default occurs, the lenders under the New Senior Secured Credit Facility would be entitled to take various actions, including the acceleration of amounts due thereunder and all actions permitted to be taken by a secured creditor.

The lenders and the agents (and each of their respective subsidiaries or affiliates) of the New Senior Secured Credit Facility and the Existing Senior Secured Credit Facility have in the past provided, and may in the future provide, investment banking, cash management, underwriting, lending, commercial banking, trust, leasing services, foreign exchange and other advisory services to, or engage in transactions with, TransDigm and TD Group and their respective subsidiaries or affiliates. These parties have received, and may in the future receive, customary compensation from TransDigm and TD Group and their respective subsidiaries or affiliates, for such services.

The above summary of the New Senior Secured Credit Facility and the Guarantee and Collateral Agreement is qualified in its entirety by reference to the New Senior Secured Credit Facility and the Guarantee and Collateral Agreement, which are attached hereto as Exhibits 10.1 and 10.2, respectively, and are incorporated herein by reference.

The information set forth in Item 1.01 is incorporated herein by reference into this Item 2.03.

The following exhibits are being filed with this Current Report on Form 8-K:

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: February 17, 2011

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EXHIBIT INDEX

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