Aircraft Performance

20 1 ,0 8 1 0 ,0 6 0 0 , 1 0 0 4 0 1 , 0 0 2 P 0 ,0 r 0 e 0 s 0 sure ALT - feet Cruise F u el - g all o n s Ti m e - m i n D u i t s e t s ance - nautical miles Associated conditions 10,000 Maximum continuous power* 3,600 lb gross weight 8,000 Flaps up 6,000 90 KIAS 4,000 No wind * 2,700 rpm & 36 in M.P. (3-blade prop) 2,000 2,575 rpm & 36 in M.P. (2-blade prop) Departure Sea level -40° -30° -20° -10° 0° 10° 20° 30° 40°C 0 10 20 30 40 50 Outside air temperature Fuel, time and distance to climb Figure 11-25. Fuel, time, and distance climb chart. Figure 11-26. Fuel time distance climb. 11-23 snoitidnoC setoN First, find the information for the departing airport. Find the To begin, find the given weight of 3,400 in the first column of OAT for the departing airport along the bottom, left side of the the chart. Move across to the pressure altitude column to find graph. Follow the line from 25 °C straight up until it intersects the sea level altitude numbers. At sea level, the numbers read the line corresponding to the pressure altitude of 6,000 feet. zero. Next, read the line that corresponds with the cruising Continue this line straight across until it intersects all three altitude of 8,000 feet. Normally, a pilot would subtract these lines for fuel, time, and distance. Draw a line straight down from the intersection of altitude and fuel, altitude and time, and Flaps up a third line at altitude and distance. It should read three and Gear up 2,500 rpm one-half gallons of fuel, 6 minutes of time, and nine NM. Next, 30 "Hg NORMAL CLIMB 120 PPH fuel flow 110 KIAS repeat the steps to find the information for the cruise altitude. Cowl flaps open Standard temperature It should read six gallons of fuel, 10.5 minutes of time, and 15 NM. Take each set of numbers for fuel, time, and distance 1. Add 16 pounds of fuel for engine start, taxi, and takeoff allowance. 2. Increase time, fuel, and distance by 10% for each 7 °C above standard and subtract them from one another (6.0 – 3.5 = 2.5 gallons of temperature. 3. Distances shown are based on zero wind. fuel). It takes two and one-half gallons of fuel and 4 minutes of time to climb to 10,000 feet. During that climb, the distance From sea level Press Rate of c to o p v e o r f e t d h e is c s h i a x r t N , t M he . s R e e n m um em be b r e s r d , o ac n c o o t r t d a i k n e g i t n o t o th a e c c n o o u te n s t w at i n th d e , (p W o e u i n g d h s t ) ( A fe L e T t) c f l p im m b (m T in im ut e es) F (p u o e u l u n s d e s) d D (n is a t u a t n ic c a e l miles) and it is assumed maximum continuous power is being used. 4,000 S.L. 605 0 0 0 4,000 570 7 14 13 8,000 530 14 28 27 The next example is a fuel, time, and distance-to-climb table. 12,000 485 22 44 43 16,000 430 31 62 63 For this table, use the same basic criteria as for the previous 20,000 365 41 82 87 chart. However, it is necessary to figure the information in a 3,700 S.L. 700 0 0 0 different manner. Refer to Figure 11-26 to work the following 4,000 665 6 12 11 8,000 625 12 24 23 sample problem. 12,000 580 19 37 37 16,000 525 26 52 53 20,000 460 34 68 72 Sample Problem 5 S.L. 810 0 0 0 4,000 775 5 10 9 Departing Airport Pressure Altitude..................Sea level 3,400 8,000 735 10 21 20 12,000 690 16 32 31 Departing Airport OAT............................................22 °C 16,000 635 22 44 45 20,000 565 29 57 61 Cruise Pressure Altitude....................................8,000 feet Takeoff Weight.............................................3,400 pounds