May 17, 2000

Dear Sir/Madam:

I would like to extend my appreciation to your representative Mr. Steve Mengos for the outstanding training provided to Raytheon employees on the Chadwick-Helmuth Systems.

Raytheon personnel raved over his instruction method coupled with clear explanation of the Chadwick-Helmuth System.

I can say that the goal of providing the most complete and value-added training for aircraft vibration management using your systems was accomplished by Mr. Mengos in a most professional manner.

We will certainly call again on your company if further training is needed.

Respectfully Submitted,