AIRPORT PLANNING MANUAL ALLOWABLE WORKING STRESS (psi) EM170APM070010.DGN 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 2 ALLOWABLE WORKING STRESS (kgf/cm ) 60 55 50 45 40 35 30 25 20 15 10 5 0 3 k= 75 lb/in 34008 (74975) 32300 (71209) 29328 (64657) 27062 (59661) 19388 (42743) 3 k= 150 lb/in 3 k= 300 lb/in 3 k= 550 lb/in 2 WEIGHT ON MAIN LANDING GEAR - kg (lb) TIRES H38 x 13-18TIRE PRESSURE 9.14 kgf/cm (130 psi) (UNLOADED) RIGID PAVEMENT REQUIREMENTS NOTES: WEIGHT AND AFT C.G. MAXIMUM POSSIBLE MAIN-GEARLOAD AT MAXIMUM DESIGN RAMP 60 55 50 45 40 35 30 25 20 15 10 5 0 THE VALUES OBTAINED BY USING THEMAXIMUM LOAD REFERENCE LINE ANDANY VALUE OF "K" ARE EXACT. FORLOADS LESS THAN MAXIMUM, THE CURVESARE EXACT FOR K=300 BUT DEVIATESLIGHTLY FOR OTHER VALUES OF "K". PAVEMENT THICKNESS (cm) 8 6 4 2 0 22 20 18 16 14 12 10 PAVEMENT THICKNESS (in.) NOTE: Rigid Pavement Requirements - Portland Cement Association Design Method Figure 7.9 EFFECTIVITY: EMBRAER170LRORSUORSE Section 7 ACFTMODEL Page 7-13 Jul 01/05 w-apm1346