Aviation Applied Tech Dir., Attn: AMSAT-R-TC (Bid Custodian), Fort Eustis, VA 23604

A -- R&D BROAD AGENCY ANNOUNCEMENT SOL DAAJ02-96-R-0001 DUE 011896 POC Hilda E. Fowler, Contract Specialist, (804) 878-4818. AMENDMENT 1. As a result of inquiries received from industry, the following is provided as clarification of the original BAA published in the CBD issue of October 3, 1995. GENERAL: (1) Participation in the unclassified programs announced in this BAA is limited to U.S. and Canadian firms who have obtained the required ''Export-Controlled DoD Technical Data Agreement'' certification number issued in accordance with DoD Directive 5230.25. TOPIC 01-96: (1) The intent of this topic is to provide an early validation of a Phase III turbine technology which is critical to achieving the overall shaft horsepower to weight ratio (SHP/wt) and specific fuel consumption (sfc) goals of the IHPTET Phase III turboshaft engine. Performance parameters for the turbine have not been defined and will depend on the overall approach chosen for attaining the SHP/wt and sfc goals for a turboshaft engine. AATD has not prioritized the type of materials in which we are interested. However, we are looking at either a gas generator turbine or a power turbine of a turboshaft engine that is consistent with the IHPTET Phase III turboshaft engine goals. Thus, the material would have to have life characteristics consistent with a gas generator turbine having a rotor inlet temperature of well beyond 3000F. Currently, we are in the process of design, fabrication and test of an IHPTET Phase II turbine and there are no Phase III turbines being tested. Phase III turboshaft engine demonstration is scheduled for 2003. TOPIC 03-96: (1) The 150 hours of total sand and rain life is broken out as 125 hours of continuous operation in the sand environment and 25 hours of continuous operation in the rain environment. (2) The low dielectric rotor erosion protection system will be used on composite rotor blade leading edge structures, utilizing fiber/resin skins such as kevlar or astroquartz. Material debonding can be a principle failure mechanism under rain conditions, and as the bonding properties are very sensitive to substrate stiffness, it is expected that substrate structural requirements may be defined by the Contractor to meet rain erosion performance goals. Currently, metal (nickel) erosion strips re used to provide long blade life in sand and rain conditions. Metal erosion strips do not provide the desired low dielectric constant. TOPIC 04-96: (1) Structural analyses are considered desirable in that they substantiate the strength of the proposed joint concepts. The analyses should demonstrate load paths through the joint to each structural element being bonded, section thicknesses at critical areas of the joint and ultimate or yield strength when subjected to tension, compression, bending or combined loads. (2) The effect of ''long term storage at elevated temperature and humidity'' is mentioned in the BAA as of interest. The concern about the effects is the deterioration of mechanical and fatigue properties because of exposure to temperatures higher than the cure temperature and absorption of water into the composite joint. (0333)

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