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Executive Summary Purpose: This test was run to determine if Bob Smith Industries1 IC-2000 Cyanoacrylate Adhesive (Extra Strength and Rubber Toughened) possesses sufficient peal strength to be used to attach stall strips to the leading edge de-icer boots on FAA, FF series BE-300 aircraft. Background: The FAA owned and operated FF series of Beechcraft model airplanes are equipped with two relatively small aerodynamic stall strips located their inboard edges at wing station 164.735. (Photo 1) (P/N 130421-01 100 .STRIP, STALL) These two triangular shaped rubber strips are attached to the de-icer boots of the aircraft originally with Bostic 1008A&B adhesive. This adhesive was superseded through a Raytheon Customer Service Request for Action 170-131 to Combi-Bond Cold Adhesive. This product was in turn superseded by AMEG Company Order allowing the use of 3M Brand Scotch Grip rubber and gasket adhesive 1300 and 1300L2. The disadvantage to all of these products is that they require 72 hours (three full days) to be fully cured. At a maintenance meeting that was discussing the prolonged delay of an aircraft to return to service it was suggested that the subject cyanoacrylate adhesive may work just as well in the application. Summary Result: Bob Smith Industries1 IC-2000 Cyanoacrylate Adhesive does possess sufficient peal strength to be used to attach stall strips to the leading edge de-icer boots on FAA, FF series BE-300 aircraft. However, the greater bond strength of the IC-2000 will prevent the removal and reuse of these stall strips from one damaged de-icer boot to a new installation. Photo 1, Stall Strip Installation: Test Methodology: Target Values: Test results provided by Richwood Industries 3, the maker of Combi- Bond Cold Bond Adhesive indicate that this product has nominal value of 49.6 Pounds per Inch (PPI) peel strength when subjected to a 90-degree Peel Test. The Peel Test bonds two one inch wide samples together then applies a perpendicular; 90 degree load to the bond line. The load at which the bond fails is the PPI value. Test Apparatus: A damaged section of Beech 300 de-icer boot was obtained and cut into four test sections. Three sections were cut to 1”x 6” strips to provide the test specimens. Brass grommets were installed at both ends of each of the test strips to allow attachment of the spring scale load measurement device. The fourth section was cut into a 6-1/2” by 6-1/2” square to function as the base section replicating the de- icer boot on the aircraft. A holding fixture was fabricated from 0.125 thick scrap aluminum plate. The plate was precision cut using our water jet cutter; this task took less than an hour from start of design to finished product. The 6-1/2” by 6-1/2” square base section was clamped between the upper and lower halves of the holding fixture by 10 #10 aircraft grade countersunk screws, washers and nuts. The base section and test strips were cleaned with MEK as called for in the Aircraft Maintenance Manual and the Combi-Bond Cold Bond Adhesive recommended practices. The test strips were applied with three slightly different methods. The first strip was applied to the base, having only been cleaned with MEK. The IC2000 was applied and the test strip was bonded to the base with moderate pressure. In this case the IC2000 was allowed to cure for 20 minutes at room temperature. The second strip was applied to the base, this time both surfaces were mildly abraded with a brass brush then been cleaned with MEK. The IC2000 was applied and the second test strip was bonded to the base with moderate pressure. In this second case the IC2000 was allowed to cure for 20 minutes at room temperature. The third strip was applied to the base, again both surfaces were mildly abraded with a brass brush then been cleaned with MEK. The IC2000 was applied and the third test strip was bonded to the base with moderate pressure. In this third case the IC2000 was allowed to cure for 2 hours at room temperature. A Chatillion brand model LG-100 push-pull spring tension gage (s/n R00067, calibrated through 12/02/09) was attached to the vertical arm of the press. The holding fixture was allowed to hang from the spring tension gage to obtain vertical alignment below the gage. The fixture clamped to the base of a manual bearing press found in our machine shop. Test Process: With the test apparatus set up as shown above, the spring tension gage was set to record maximum load. A load was applied to the bearing puller arm by hand. The load was applied at rate of roughly 10 pounds of force every second until the gage indicated 50 pounds. The load was stopped at this point to verify that the load did exceed the 49.8 ppi load of the bonding agents now in use. Once verified that the IC 2000 bond had not failed then further force was applied to the bearing press until the part failed, or in one case the gage reached its maximum reading of 100 pounds force Test Results: Condition A Side Max Load B Side Max Load MEK Wash 20 Min 75 Pounds, sample broke at 75 Pounds, sample broke at Cure eyelet hole eyelet hole Rough Surface with 67 Pounds, sample tore at 76 Pounds, eyelet pulled out of MEK Wash 20 Min glue line sample Cure Rough Surface with 69 Pounds, sample tore at 90+ Pounds, no failure of glue MEK Wash 2 Hour glue line line or sample, hit max load on Cure gage! Conclusions: IC 2000 Cyanoacrylate glue exceeds the 49.8 pound peel strength of Combi-Bond adhesive. It cures to useable strength in 5 minutes and to full strength in three hours. Recommend generating a Company Order identifying IC 2000 as a product suitable for attaching FAA owned BE-300 stall strips. NOTE: Use of IC-2000 is ONLY applicable to the 18 FAA owned and operated Beech Model 300F aircraft, authorized under the FAA's own FAR Part 135 operating certificate, and NOT AUTHORIZED for use on any other aircraft, without further testing and approval by the FAA or the Authorized Aircraft Manufacturer, or appropriate DER:/DAS/ODA." Test conducted and submitted by Thomas Solinski, AJW-3452, 405-954-6240, 09/18/2009.
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