1 EXHIBIT 99.10a 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 audit of the financial statements of the Raytheon Savings and Investment Plan (10014) as of December 31, 1997 and for the period from December 17, 1997 to December 31, 1997, which report is included in this annual report on Form 10-K/A. Coopers & Lybrand LLP Boston, Massachusetts June 29, 1998