<ARTICLE> 5 <CIK> 0001077672 <NAME> TRANSDIGM HOLDING COMPANY <MULTIPLIER> 1,000 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> SEP-30-1998 <PERIOD-END> SEP-30-1998 <CASH> 19,486 <SECURITIES> 0 <RECEIVABLES> 12,795 <ALLOWANCES> 265 <INVENTORY> 18,280 <CURRENT-ASSETS> 54,260 <PP&E> 39,156 <DEPRECIATION> 17,205 <TOTAL-ASSETS> 115,785 <CURRENT-LIABILITIES> 37,606 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 24,281 <OTHER-SE> 12,146 <TOTAL-LIABILITY-AND-EQUITY> 115,785 <SALES> 110,868 <TOTAL-REVENUES> 110,868 <CGS> 59,395 <TOTAL-COSTS> 59,395 <OTHER-EXPENSES> 21,175 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 3,175 <INCOME-PRETAX> 27,123 <INCOME-TAX> 12,986 <INCOME-CONTINUING> 14,137 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 14,137 <EPS-PRIMARY> 0 <EPS-DILUTED> 0