AIRPORT PLANNING MANUAL ALLOWABLE WORKING STRESS - psi EM170APM070020.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 33064 (72894) 31400 (69225) 29336 (64675) 26892 (59287) 19398 (42765) 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 8.86 kgf/cm (126 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 7.8 EFFECTIVITY: EMBRAER 170 STD ACFT Section 7 MODEL Page 7-12 Dec08/03 b-apm1346