Transdigm Holding S-4 Registration of securities issued in business combination transactions

														EXHIBIT 12.1
	COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
	(Dollars in Thousands)
																Pro Forma
																Thirty-Nine
	Fiscal Year Ended September 30,											Thirty-Nine Weeks Ended				Weeks Ended
	1998		1999			2000		2001		2002		June 29,  2002		June 28,  2003		June 28,  2003
Earnings:
Total earnings (loss)	$	14,137	$	(16,917	)	$	10,779	$	14,358	$	30,629	$	20,864	$	39,859	$	35,960
Income tax provision (credit)	12,986		(2,772		)	7,972		9,386		16,804		13,516		22,420		8,014
Pre Tax Earnings (loss)	27,123		(19,689		)	18,751		23,744		47,433		34,380		62,279		43,974
Fixed charges:
Interest charges	3,175		22,722			28,563		31,926		36,538		27,200		26,163		38,987
Interest factor of operating rents	197		227			323		365		419		314		441		480
Total fixed charges	3,372		22,949			28,886		32,291		36,957		27,514		26,604		39,467
Earnings as adjusted	$	30,495	$	3,260		$	47,637	$	56,035	$	84,390	$	61,894	$	88,883	$	83,441
Ratio of earnings to fixed     charges	9.0		--			1.6		1.7		2.3		2.2		3.3		2.1