Exhibit 21.1

SUBSIDIARIES OF TRANSDIGM HOLDING COMPANY

TransDigm Inc. is a wholly owned subsidiary of TransDigm Holding Company.

TransDigm Inc. owns, directly or indirectly, the following subsidiaries:

Name of Subsidiary	State or jurisdiction of Incorporation or Organization
MarathonNorco Aerospace, Inc.	Delaware
ZMP, Inc.	California
Adams Rite Aerospace, Inc.	California
Champion Aerospace Inc.	Delaware
Christie Electric Corp.	California
Marathon Power Technologies Limited	England
TD Finance Corporation	Delaware
Avionic Instruments, Inc.	Delaware
DAC Realty Corp.	New Jersey
Skurka Aerospace Inc.	Delaware