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Flight ComputerAviation Supplies & Academics, Inc.Newcastle, Washington 98059-3153

GETTING STARTEDPush the button to turn the flight computer on.Pressing the key followed by the key willturn the calculator off. The CX-2 will autom

CONVERSIONSOften it is necessary to convert from one unit of meas-urement to another. The CX-2 has 16 conversion func-tions that are activated by pres

To convert 200 knots to KPH (Kilometers per hour), enter:The answer is 370.4 KPH.Kilometers to StatuteStatute to KilometersThe CX-2 does not have a fu

Pounds to KilogramsKilograms to PoundsTo convert 2,000 pounds to kilograms, enter:The answer is 907.1847 kilograms.To convert 160 KG to pounds, enter:

The display will be 02:30:30.Add 30 seconds to the display by keying:The display will be 02:31:00. The HH:MM:SS displaycan be easily converted to an H

To convert -20° Celsius to Fahrenheit, enter:The answer is -4°F.Millibars to InchesInches to MillibarsTo convert 970 mb pressure to inches of mercury,

The computer will prompt you for the inputs, and theanswers will display below the double line at the bot-tom of the screen. The formulas used for the

played as Xph, where X can be gallons, liters, or poundsas long as the same unit is used for the Rate and Fuel.The CX-2 will convert any headings exce

CALCULATORStandard mathematics is conventional in the CX-2. Thecomputer performs the four standard arithmetic opera-tions (addition, subtraction, mult

the standard atmospheric pressure at sea level, 29.92''Hg. PAlt is required to calculate true airspeed (TAS)and density altitude (DAlt).The

2CX-2 PathfinderFlight Computer Instructions© 2001 ASAAll rights reserved. Published 2001.AirClassics and CX-2 are trademarksof Aviation Supplies &

Density AltIn aviation calculations, air density is normally speci-fied by an altitude in a standard atmosphere, instead ofpounds per cubic foot. The

for the standard atmosphere. The Std Atmos function isvalid up to 200,000 feet.Problem: What are the standard atmospheric condi-tions at sea level?Sol

Problem: At approximately what altitude above thesurface can the pilot expect the base of cumuliformclouds if the surface air temperature is 82°F and

speeds for preflight planning, where OAT is availableduring ground operations, and use “Act” airspeeds forin-flight calculations, where TAT is availab

Act TASThe Act TAS function computes true airspeed usinginformation from instruments during an actual flight.The inputs to this function are CAS, TAT,

Problem: What is the required CAS or MACH toobtain 150 knots TAS with 6,500 feet PAlt and -5°COAT?Solution: Press the key. Select the Airspeed sub-men

Plan Mach# function and press:to enter 0.72 MACH. Next, press:to enter -35°C OAT. The display will now show 433.0kts TAS and -10.31°C TAT.Act MACH#The

Problem: How much fuel will burn in 1 hour, 14 min-utes, and 38 seconds at a rate of 9.5 gallons per hour?Solution: Press the key. Select the Fuel su

Xph Rate. Since the amount of fuel was given inpounds, the answer is in pounds per hour.EnduranceThe Endurance function calculates the duration of tim

Problem: What is the THdg given a 155° TCrs, 125 ktsTAS, with winds of 350° WDir and 15 kts WSpd?Solution: Press the key. Select the Plan Leg sub-men

CONTENTSPageINTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . .5KEYPAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7GETT

to return to the Plan Leg menu). Press to select theHdg/TAS function and press:to enter 10° TCrs,to enter 143 kts GS, then press:to enter 250° WDir,

to return to the Plan Leg menu). Press to select theCompass Hdg function. Press:to enter the true heading, then:to enter the westerly variation (east

ETAThe ETA function computes the estimated time ofarrival (ETA), given the departure time (Dep) and flightduration (Dur). Typically, Dur comes from th

return to the Plan Leg menu). Press to select theTo/From function and press:The display will show 330° as the course FROM thestation.Act LegDist Flow

return to the Act Leg menu). Press to select the GSfunction. Press:to enter 00:02:32 Dur, and press:to enter 5 NM Dist. The display will show 118.4 k

X/H-WindThe X/H-Wind function computes the head- or tail-wind component and the left or right crosswind com-ponent for a given wind and runway. The wi

wind) and -7.7 HWnd (the negative sign indicates aheadwind).GlidingGlide DistGlide Dist computes the horizontal distance (DIST) innautical miles, give

Desc function, then press:to enter the glide distance and ratio. The answer is4,143 feet.Glide RatioGlide Ratio computes the glide ratio (RAT) given t

gross weight and center of gravity (Wt/Bal Total). Thesteps are described below in the context of solving abasic weight and balance problem.Standard w

Use the CX-2 default RF of 1 for this problem,which means the moment entries will be taken atface value.2. Press , then to select the Wt/Mom Entryfu

Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26Fuel Burn . . . . . . . . . . . . . . . . . . . . . . . . . .26Fuel Rate . .

Wt . . . . . . . .2,205 lbsMom . . . . . .204,443 lb-inCG . . . . . . . .92.72''If the given information provides for all arms, then youdo

#Items . . . . .4RF . . . . . . . .1Wt . . . . . . . .2,105 lbsMom . . . . . .199,643 lb-inCG . . . . . . . .94.84''Problem: Continuing

The last item in the Wt/Bal menu is %MAC. Large air-craft operations often require the CG be expressed as apercent of the mean aerodynamic chord (%MAC

the time zone number to input). Press .The CX-2 will return to the previous menu.3. Press for the Set Local menu.4. Press to enter 11:15. TheCX-2 wil

If the time is after noon, you will need to enter the timebased on a 24-hour clock; for example, 2 p.m. wouldbe 14:00:00. To set the clock to 1:30 p.m

2. Press to set the local time. Press .3. Results in UTC of 21:05 (8 hours later).You can convert time using the Calculator.Problem: The local time i

StopwatchThe Stopwatch will count from zero to 99:59:59. Pressfollowed by to access the Stopwatch.1. Press (Run) to start the Stopwatch.2. Press (St

APPENDIX A: Sample ProblemsProblems SolutionsMath Review(2 + 63) · 3 = ________________________19517 ÷ 6 = ____________________________2.8333335 – 12.

AltitudePress AltDetermine the pressure altitude with an indicated alti-tude of 1,380 feet MSL with an altimeter setting of28.22 at standard temperatu

Act TASWhat is your actual true airspeed with a total air tem-perature of 0°C, CAS 150 knots, and pressure altitude25,000?TAS 234.1 kts, OAT -7.22°C,

INTRODUCTIONASA’ s CX-2 is the next generation of aviation comput-ers. Using the latest microchip and display technolo-gies, it out-performs its most

Plan LegHdg/GSWhat is your true heading and ground speed given thefollowing conditions: Wind 330° at 16 knots, course165°, and TAS 145? THdg 166.6°, G

Act LegDist FlownHow far have you traveled if you have a 138-knotground speed, and have been flying for 40 minutes?Dist 92.0 NMGSWhat is your ground s

Glide RatioA sailplane has lost 4,100 feet in 15 NM; therefore,glide ratio for this aircraft is approximately _________.Rat 22:1Wt/BalWhat is the CG a

% MACWhat is the CG in %MAC given following conditions:MAC . . . . . . . . .180.7''CG . . . . . . . . . .891.27''LMAC . . . . .

APPENDIX B: Service PolicyTroubleshootingVisit the ASA website (www.asa2fly.com) for manualrevisions, technical support, and FAQs for this product.1.

sure to include name, address, city, state, and zip code.Please print. The shipment should be carefully pack-aged and adequately protected against sho

Limited WarrantyAviation Supplies & Academics, Inc. (ASA) warrantsthis electronic computer, Model Number CX-2, to theoriginal purchaser for a peri

Some states do not allow the exclusion or limitationof implied warranties or consequential damages; so, theabove limitations or exclusions may not app

APPENDIX C: Abbreviations GuideAct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .actualCAS . . . . . . . . . . . . . . . . . . .

RnWy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .runwayStd Atmos . . . . . . . . . . . . . . . . .standard atmosphereTAS . . . . .

from one function to the next with a minimum ofkeystrokes: to plan a flight, simply work from themenus in sequential order as you fill in your flightp

INDEXAabbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58Act Leg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FFAA Knowledge Exams . . . . . . . . . . . . . . . . . . . .5, 9Fahrenheit to Celsius . . . . . . . . . . . . . . . . . . . . . . .14feet to meters

Lleg time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31liters to gallons . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ttime zones, worldwide . . . . . . . . . . . . . . . . . . . . . .43timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45To/

64NOTES

6. Timers and clocks. The CX-2 has two timers: a stop-watch that counts up, and a count down timer. Thestopwatch can be used to keep track of elapsed

Changes display to the previous menu.and Used to navigate about the menu struc-ture. When alternated with , darkens andlightens display screen (sele

Changes sign (positive or negative) of currentinput line.Separates hours from minutes and minutes fromseconds on time inputs. For example, 2 hours,38