EXHIBIT 99.3

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER

        Pursuant to 18 U.S.C. Section 1350, as created by Section 906 of the
Sarbanes-Oxley Act of 2002, the undersigned officer of TransDigm Holding Company
(the "Company") hereby certifies, to such officer's knowledge, that:

        (i)     the accompanying Quarterly Report on Form 10-Q of the Company
     for the quarterly period ended March 29, 2003 (the "Report") fully complies
     with the requirements of Section 13(a) or Section 15(d), as applicable, of
     the Securities Exchange Act of 1934, as amended; and

        (ii)    the information contained in the Report fairly presents, in all
     material respects, the financial condition and results of operations of the
     Company.

Dated: May 12, 2003                           /s/ W. Nicholas Howley
                                             ---------------------------
                                             W. Nicholas Howley
                                             Chief Executive Officer

The foregoing certification is being furnished solely to accompany the Report
pursuant to 18 U.S.C. Section 1350, and is not being filed for purposes of
Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be
incorporated by reference into any filing of the Company, whether made before or
after the date hereof, regardless of any general incorporation language in such
filing.