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Summary of Contents for ASA Electronics AirClassic E6-B
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E6-B Flight Computer Instructions This instruction booklet can be used with the three different E6-B models available from ASA. If you have a different model than the one depicted, some parts of your computer may appear slightly different from the computers pictured in this booklet. How- ever, the calculations are accomplished with the same method and produce the same answers.
Contents Instructions for Using ASA Flight Computer ... 4 The Slide Rule Side ... 5 Time, Speed, and Distance Problems ... 8 Fuel Consumption Problems ... 11 Conversions ... 13 Nautical to Statute Miles ... 13 U.S. Gallons to Imperial Gallons ... 15 Quantity/Weight Conversions ...
Instructions for Using ASA Flight Computer Your ASA E6-B Flight Computer has two main parts: a circular slide rule side for making quick calculations, and a wind side for computing ground speed and wind correction angle. The slide portion of the circular slide rule side also includes quick- reference material.
The Slide Rule Side The term “circular slide rule” shouldn’t be intimidat- ing. This side of your computer simply consists of a rotating disk with numbers on the middle scale, which when set against similar numbers on the fixed portion ( outer scale), allows you to solve problems of time, speed, and distance, calculate fuel consumption, and make conversions be- tween measurements such as statute and nauti-...
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Now look at the number 15 on the disk. Between 15 and 16 each calibration mark is equal to .2 and would be read as 15.2, 15.4, etc. If you were solving a problem with an airspeed of 150 knots, the first calibration past 15 (150 in this case) would be 152.
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Figure 2. Line up the number 60 (the rate arrow) with the number 12 on the outer disk (or, scale).
Time, Speed, and Distance Problems The rate arrow on the disk is always set to indicate a value per hour on the outer scale. There are three basic time-speed-distance problems. In two of these problems you know the rate, while in the third prob- lem, the rate is part of the answer you are looking for.
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In the final and most common type of time-speed- distance problem, the time and distance are known, and you need to solve for unknown speed. The rate arrow represents the answer. You will have flown between two known ground reference points 26 NM apart and checked the time between them to be: 13 (thirteen minutes, that is, not thirteen hours).
Fuel Consumption Problems Problems involving fuel consumption, fuel endur- ance, and fuel capacity are solved using the same numbers you used in the time-speed-distance prob- lems. With the exception of time values, only the names change. Assume that your airplane’s Approved Flight Manual indicates fuel consumption of 8.4 gallons per hour at a given power setting and that the usable fuel capacity is 64 gallons.
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When you paid for your fuel you noted on the delivery ticket that it took 32 gallons to top the tanks. You flew four hours and twenty minutes before stopping for fuel. What was the average fuel con- sumption? This time the rate arrow provides the answer.
You can’t solve a problem unless the values agree. You can’t mix statute and nautical miles, gallons and liters, or Fahrenheit and Celsius. Your ASA E6-B Flight Computer makes it possible for you to convert between values with simple settings of the middle scale.
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You can convert either nautical or statute miles to kilometers. Find the KM marking on the outer scale. Set the known value beneath the NAUT or STAT arrow as before, and read kilometers under the KM marking. For example, to convert 115 stat- ute miles to kilometers: 1.
U.S. Gallons to Imperial Gallons Your Approved Flight Manual lists fuel capacity in U.S. gallons, but in many countries fuel is delivered in Imperial gallons. Arrows marked U.S. GAL and IMP. GAL are provided on both middle and outer scales to help you convert between these quanti- ties.
middle scale and read 38.5 U.S. gallons on the outer scale. Quantity/Weight Conversions Aviation gasoline weighs 6 pounds per U.S. gallon. For weight and balance calculations, aviation gaso- line weight-per-gallon can be determined by lining the U.S. GAL arrow on the middle scale with the FUEL LBS arrow on the outer scale.
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Figure 12 1. Align the arrows. 2. Read 15 pounds on the outer scale opposite of 2 gallons on the middle scale. See Figure 12. Imperial gallon weight of fuel and oil may also be determined in the same manner by lining up the IMP.
The E6-B provides windows on the slide rule side so you can allow for these variations when converting calibrated airspeed to true airspeed or indicated altitude to true altitude.
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Figure 13 3. Read the density altitude over the arrow in the DENSITY ALTITUDE window. See Fig- ure 13. Figure 13 shows a pressure altitude of 15,000 feet set opposite an outside air temperature of -15°C. A calibrated airspeed of 145 knots converts to a true airspeed of 183 knots and a density altitude of 15,000 feet under these conditions.
Converting Mach Number to True Airspeed To convert Mach Number to True Airspeed (or vice versa), rotate the inner dial until you see the Mach No. Index inside the airspeed correction window on the inner dial. Line up the true or outside air tem- perature (do not use Indicated Air Temperature) opposite this Mach No.
True Altitude When the air is colder than standard your altimeter can mislead you into thinking you are higher than you actually are. Determine true altitude by the following steps: 1. Determine pressure altitude by setting 29.92 momentarily on the altimeter. 2.
If the station altitude is unknown, read calibrated altitude MSL on the middle scale and true altitude MSL on the outer scale. In Figure 15 the pressure altitude is 10,000 feet, station altitude is 5,000 feet, outside air temperature is -19°C, and your indicated (calibrated) altitude is 12,000 feet.
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ground speed will indicate 450 feet per minute, while a jet following that same gradient at 240 knots ground speed will show a vertical speed of 1,200 feet per minute. You can convert feet per mile to feet per minute by placing the rate arrow opposite to the ground speed, finding the feet per minute value on the outer scale lined up with the feet per mile value on the...
(Answers are on Page 38) GROUND SPEED Off-Course Problems When you navigate by pilotage, you will occasion- ally find your airplane has drifted off the planned course due to the wind. If you find yourself over a landmark to one side of the course line you should be able to estimate the distance you have drifted off course (the scale of sectional charts is 8 statute miles to the inch), and your flight log should help...
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Figure 17 opposite of the distance off course; read additional degrees of heading change opposite of the rate arrow. Add the two answers and apply the result to your heading. Example: Your destination is 235 miles ahead ( see Figure 18 on the next page). 1.
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Figure 18 Figure 19 shows the setups in equations. Figure 19...
The Crosswind Table To determine headwind, tailwind or crosswind component quickly and easily, you must know the angle between your course and the reported wind direction. You also must know the reported wind velocity. This will be especially helpful in anticipat- ing the effect of wind when landing, because wind reported by a tower, flight service station, or ATIS is surface wind.
TRUE INDEX. Measure up from the grommet and make a dot equal to the wind velocity. Each line equals 1 knot on the E6-B, 2 knots on the paper (E6B-P) and micro (E6B-1) models, and 1 or 10 knots on the high-speed E6-B slide accessory (E6B-SLIDE).
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–E VAR = MC Figure 21 Note: Some slight variations exist on the E6-B models, but the calculations are the same; be sure to count the lines accurately. –L WCA = MH MH ± DEV = CH...
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— the value of each line changes at the 100, 150, or 250 knot arc, depending on the E6-B model you are using ( see Note below Figure 21). Example: You have laid out a course on a sectional chart and measured it to be 090°...
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Figure 22 Here are some sample problems: (Answers are on Page 38) TRUE WIND WIND DIREC. VELOCITY COURSE TAS 1. 240 2. 040 3. 330 4. 110 TRUE TRUE GROUND SPEED...
Figure 23 Determining Winds in Flight Winds aloft forecasts are frequently in error. If you have an autopilot and some free time, you can calculate the actual winds at your location and altitude. It helps if you have GPS, too. To solve an inflight wind problem you need your ground speed, true heading, true course, and true airspeed.
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check came out to be 120 knots, and you calculate the true airspeed at your altitude to be 140 knots. 1. Set 180° at the TRUE INDEX on the wind side of the computer. 2. Move the slide until the grommet falls over the line marked 120.
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