Repair of shipboard machinery and equipment requires information and expertise not easily available to shipboard maintenance personnel. What information that is available is generally embedded in technical manuals or maintenance/repair cards that are difficult to decipher, bulky, and sometimes hard to maintain. A system that allowed for improved maintenance aiding and guidance to non-experts would provide a more reliable and broadly available capability, which would enhance safety, reduce costs, and improve operational readiness. Under two phase I SBIR contracts for the USAF (f33615-86-c-5169 and -5170), the feasibility for a portable expert system as a maintenance aid for the field repair technician in the inspection and repair of composites, was demonstrated using an off-the-shelf expert system shell and a PC class laptop portable computer. It is proposed to build on the work and demonstrate a maintenance advisor/trainer for onboard ship use. It will be portable, have voice operation, incorporate the latest technology in data storage, graphics, and interactive displays. It will demonstrate a small selected set of current maintenance aids.