Transicoil, L.L.C., which makes aerospace instruments in Collegeville, Montgomery County, is in the process of laying off 50 employees because one product line is being shifted to a "sister company" in Wichita, Kan.

As required by the federal Worker Adjustment and Retraining Notification Act, Transicoil sent a letter to the Pennsylvania Department of Labor and Industry of regarding the permanent layoffs. The letter said the first of the 50 layoffs was to occur March 13. Four other employees have been notified they will lose their jobs between March 27 and May 9.

"The remaining 45 employees will be separated at a date in the future which has not yet been determined," according to the company letter, dated March 13.

Transicoil officials could not be reached for comment Friday evening.

Transicoil is part of Transdigm Group, Inc., which is headquartered in Cleveland. Airborne Systems of Pennsauken and Avionic Instruments L.L.C. of Avenel, N.J. are also subsidiaries of Transdigm Group.

The WARN letter said the "motion control product line" of Transicoil will be transferred to Wichita, which is the location of a subsidiary called Electromech Technologies, according to the Transdigm website.