1 EXHIBIT 99.5a CONSENT OF INDEPENDENT ACCOUNTANTS To the Board of Directors of Raytheon Company We consent to the incorporation by reference in the Registration Statement of Raytheon Company on Form S-8 (File No. 333-56117) of our report dated May 29, 1998 on our audits of the financial statements of the E-Systems, Inc. Employee Savings Plan as of December 31, 1997 and 1996 and for the year ended December 31, 1997, which report is included in this annual report on Form 10-K/A. Coopers & Lybrand LLP Boston, Massachusetts June 29, 1998