EXHIBIT 23






We have issued our report dated February 25, 1998 for the year ended December
31, 1997, and our report dated February 28, 1997 for the years ended December
31, 1996 and 1995 accompanying the consolidated financial statements of SPD
Technologies, Inc. and subsidiaries included in this Form 8-K/A. We hereby 
consent to the incorporation by reference of said reports in the Registration
Statements of L-3 Communications Holdings, Inc. on Form S-8 (File No. 333-64389
effective September 25, 1998 and File No. 333-59281 effective July 17, 1998).


                                              /s/ Grant Thornton LLP




New York, New York
October 26, 1998