Exhibit 99.3

TRANSDIGM INC.

OFFER TO EXCHANGE
UP TO $1,200,000,000 IN AGGREGATE PRINCIPAL AMOUNT OF
4.625% SENIOR SUBORDINATED NOTES DUE 2029 FOR
ALL OF ITS OUTSTANDING
4.625% SENIOR SUBORDINATED NOTES DUE 2029
SOLD IN A TRANSACTION EXEMPT FROM REGISTRATION
UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
AND
UP TO $750,000,000 IN AGGREGATE PRINCIPAL AMOUNT OF
4.875% SENIOR SUBORDINATED NOTES DUE 2029 FOR
ALL OF ITS OUTSTANDING
4.875% SENIOR SUBORDINATED NOTES DUE 2029

SOLD IN A TRANSACTION EXEMPT FROM REGISTRATION
UNDER THE SECURITIES ACT OF 1933, AS AMENDED

To Our Clients:

Enclosed for your consideration is a Prospectus dated , (as the same may be amended or supplemented from time to time, the “Prospectus”) and a form of Letter of Transmittal (the “Letter of Transmittal”) relating to the offer (the “Exchange Offer”) by TransDigm Inc. (the “Company”) to exchange up to $1,200,000,000 in aggregate principal amount of its 4.625% Senior Subordinated Notes due 2029 (CUSIP No. 893647 BP1) and up to $750,000,000 in aggregate principal amount of its 4.875% Senior Subordinated Notes due 2029 (CUSIP No. 893647 BQ9), which have been registered under the Securities Act of 1933, as amended (the “Securities Act”), for all of its outstanding 4.625% Senior Subordinated Notes due 2029 (CUSIP Nos. 893647 BM8 and U8936P AV5) and 4.875% Senior Subordinated Notes due 2029 (CUSIP Nos. 893647 BN6 and U8936P AW3) (collectively, the “Original Notes”) issued and sold in separate transactions exempt from registration under the Securities Act, respectively.

This material is being forwarded to you as the beneficial owner of Original Notes carried by us for your account or benefit but not registered in your name. A tender of any Original Notes may be made only by us as the registered holder and pursuant to your instructions. The accompanying Letter of Transmittal is furnished to you for informational purposes only and may not be used by you to exchange the Original Notes held by us and registered in our name for your account or benefit. Therefore, the Company urges beneficial owners of Original Notes registered in the name of a broker, dealer, commercial bank, trust company or other nominee to contact such registered holder promptly if they wish to tender Original Notes in the Exchange Offer.

Accordingly, we request instructions as to whether you wish us to tender any or all of your Original Notes, pursuant to the terms and conditions set forth in the Prospectus and Letter of Transmittal. We urge you to read carefully the Prospectus and Letter of Transmittal before instructing us to tender your Original Notes.

YOUR INSTRUCTIONS TO US SHOULD BE FORWARDED AS PROMPTLY AS POSSIBLE IN ORDER TO PERMIT US TO TENDER ORIGINAL NOTES ON YOUR BEHALF IN ACCORDANCE WITH THE PROVISIONS OF THE EXCHANGE OFFER. The Exchange Offer will expire at 5:00 p.m., New York City time, on , , unless extended (the “Expiration Date”). Original Notes tendered pursuant to the Exchange Offer may be withdrawn, subject to the procedures described in the Prospectus, at any time prior to the Expiration Date.

If you wish to have us tender any or all of your Original Notes held by us for your account or benefit, please so instruct us by completing, executing and returning to us the instruction form that appears below. Please note that the accompanying Letter of Transmittal is furnished to you for informational purposes only and may not be used by you to tender Original Notes held by us and registered in our name for your account or benefit.

INSTRUCTIONS

The undersigned acknowledge(s) receipt of your letter and the enclosed material referred to therein relating to the Exchange Offer of TransDigm Inc.

THIS WILL INSTRUCT YOU TO TENDER THE PRINCIPAL AMOUNT OF ORIGINAL NOTES INDICATED BELOW HELD BY YOU FOR THE ACCOUNT OR BENEFIT OF THE UNDERSIGNED, PURSUANT TO THE TERMS AND CONDITIONS OF THE EXCHANGE OFFER SET FORTH IN THE PROSPECTUS AND THE LETTER OF TRANSMITTAL.

Box 1	Please tender my Original Notes held by you for my account or benefit. I have identified on a signed schedule attached hereto the principal amount of Original Notes to be tendered if I wish to tender less than all of my Original Notes.
Box 2	Please do not tender any Original Notes held by you for my account or benefit.
Date:
		Signature(s)
		Please print name(s) here
		Address and Telephone Number

Unless a specific contrary instruction is given in a signed schedule attached hereto, your signature(s) hereon shall constitute an instruction to us to tender all of your Original Notes.

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