Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of TransDigm Holding Company (the “Company”) for the thirteen and thirty-nine week periods ended June 26, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, W. Nicholas Howley, President, Chief Executive Officer and Director (Principal Executive Officer), certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1.	The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities and Exchange Act of 1934; and

2.	The information contained in the Report fairly presents, in all material respects, the financial condition of the Company as of the dates indicated and results of operations of the Company for the periods indicated.

Date: August 5, 2004


		/s/ W. Nicholas Howley
Name:		W. Nicholas Howley
Title:		President, Chief Executive Officer and Director

TRANSDIGM HOLDING CO 10-Q