1 ~\ J\ G J\ Z I I I r' - American Bonanza Society

GENERAL AVIATION NEWSTHREE-BLADED TOP PROpTMHartzell Propeller Inc. has earned STCapproval for the three-bladed Tap Prop"" propellerfor the G36. Hartzell now hos approvalfor all F33A, V35B, A36 and G36 Bonanzaspowered by factory-originol TCM 10-520 ond10-550 engines, including aircraft equippedwith 28-voll electrothermal propeller de-icesystems.-Our obiective wos to offer a reasonablypriced, larger-diameter propeller for improvedpertormance without increasing the noise signature;said Mike Trudeau, Top Prop ProgramManager. -At 82' diameter, the propeller is 2"lorger than the original Bonanza prop, whichprovides on increase in takeoff and climb performance.Bonanza owners have also reporteda 2-4 knot improvement in cruise speed.-The scimitar-shaped, swept-tip bladesare free of life-limiting airworthiness directivesand came with the longest TBO available for aBonanza propeller sysfem (6 yeors / 2400hours). The propeller comes with a worrontythat provides fhree years or 1,000 hours ofcoverage.Cast for the complete kif is S9,995withauf de-ice and SI 0,495-S 11,495 withelectrothermal de-ice, depending an thesysfem if replaces. Prices include fhe PHC­C3YF-l RF/F8068(K) model propeller, highlypolished spinner and STC paperwork.For mare infarmafian, see www.hartzellprop.cam or coli 800-942-7767./ ,." ,- ~ - - ~ --~ADRIAN EICHHORN & RON TIMMERMANS- - -Continued from page 7096 7METALLIC BRAKE LININGS AND BACKING PLATEStn the photo below you see metalliC broke linings that, when squeezedagainst the discs, provide the braking action on your Beechcroft.The linings areheld in place to their steel backing plates by small circular alignment studs. Itis these studs that are making the circular spots on the discs (yellow arrows) .When the brake linings become well worn (red arrows), theends of the studs come into contact with the discs. When thathappens, it leaves a tell-tale circular spot on the disc, These spatsindicate it's time to replace your metallic broke linings because ifleft unchecked, the stud would soon wear a groove in the disc,causing a very expensive repair.Interestingly, we found that this condition occurs primarily with metallicbroke linings (usually installed on wheel size 6.50 x 8). Spots do not appearon discs with organic broke linings (usually installed on wheel size 7,00 x 6)because the linings are attached to their backing plates with rivets, not studs.LTC (Ret) Adrian A. Eichhorn af Alexandria,VA, is on A&P with Inspection Authorizationand a BPPI' instructor. He owns a 1962 P35and flies an A320 Airbus for a mojor airline.Ron Timmermons of Bedford. I X. is aRegional Program Manager for a largeEngr I Constr firm in Dallas, TX. He is presidentof BPPP and has owned hNo Bonanzas,Good linings (on left) VS. worn linings with holes where alignment studs ore located (red arrows).Adrian and Ron are both NAFI Master CFlsand Master Ground Instructors whom youwill meet when you attend a BPPP clinic.ABS September 2008www.bononzo.orgPage 10965