NASA Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135

A -- DESIGN AND FABRICATION OF PROTOTYPE TRANSMISSION (GEARBOX) FOR A VERY HIGH ALTITUDE SUBSONIC AIRCRAFT DUE 120696 POC Michael Kinkelaar, Contracting Officer, (216) 433-2736, MS 500-306 or Internet E-Mail: Mike.Kinkelaar@lerc.nasa.gov David Bents, Project Manager, (216) 433-6135, MS 301-3. NASA Lewis Research Center seeks sources for the design and development of a prototype transmission for very high altitude (up to 85,000 ft) subsonic, propeller driven aircraft. The prototype transmission shall be designed for integration into the drivetrain of the propeller driven research aircraft. The prototype transmission will be tested in a very high altitude test chamber at NASA Lewis Research Center. A fixed price contract is contemplated for the design and development of the prototype transmission It is anticipated that the Government will issue multiple contracts (at least two) for the prototype transmission design with the intention of selecting one of the designs for a follow on contract for fabrication of the prototype transmission. The propeller driven research aircraft is powered by a 4 cylinder 4 stroke opposed piston engine of 1.2 liters displacement pressurized with multiple stages of turbocharging for altitude compensation. The engine incorporates an internal 2.27:1 primary reduction gear with torsional windup spring damper to its output flange,but additional speed reductions of approximately 5 : 1 and 10 : 1 are needed to drive the 18 - 20 ft diameter propeller, along with clutching and braking mechanisms to decouple and control the prop. The prototype will be dynamometer tested in an altitude chamber as part of a propulsion test unit that is subjected to ambient pressures as low as 1/60 atm, and temperatures low as - 100 F. To reduce cost to future developers and users of the aircraft it is desired for the transmission to be based on existing hardware to the maximum possible extent. NASA seeks innovative design solutions with minimum custom designed specially fabricated mechanical parts ( excluding shafts, housings, mountings and adapters etc. ) and maximum utilization of existing OEM ( current production ) power transmission parts ( gearsets, clutch packs, bearings and seals, belts and pulleys etc. ) as may be adapted from available aircraft, automotive, marine or industrial drives. Any interested source shall provide a response by December 6, 1996, at M.S. 500-306. Potential sources shall provide information related to their overall scientific, technical, and engineering capabilities and related experience including equipment and company resources which are pertinent to the proposed procurement. Subsequent to receipt and evaluation of this notice, NASA intends to issue a formal Request for Offer (RFO) to fulfill the requirements for this procurement. It is anticipated that the formal RFO will be issued about early January 1997 with proposals due thirty days later. Estimated period of performance is five months. Any interested source shall identify their status as a small business, large business or 8(a) firm. See Numbered Note(s): 25. (0327)

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