Summary of Contents for Aviation Supplies CX-2
- Page 1 Flight Computer Aviation Supplies & Academics, Inc. Newcastle, Washington 98059-3153...
- Page 2 CX-2 Pathfinder Flight Computer Instructions © 2001 – 2007 ASA All rights reserved. Published 2001. AirClassics and CX-2 are trademarks of Aviation Supplies & Academics, Inc. Aviation Supplies & Academics, Inc. 7005 132nd Place SE Newcastle, WA 98059-3153 www.asa2fly.com Printed in China...
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Page 3: Table Of Contents
CONTENTS Page INTRODUCTION ......5 KEYPAD .......7 GETTING STARTED . - Page 4 Fuel ....... . Fuel Burn ......Fuel Rate .
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Page 5: Introduction
Using the latest microchip and display technolo- gies, it out-performs its most sophisticated electronic rivals. The features of the CX-2 make it the most versatile and useful aviation calculator available. 1. May be used for FAA Exams. The CX-2 complies with Advisory Circular (AC) 60-11, “Test Aids and... - Page 6 4. Ergonomic design. The CX-2 features a very simple keyboard and slim design. The carrying case will protect your computer inside the flight bag, and fits on the backside of the unit for easy storage while in use.
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Page 7: Keypad
6. Timers and clocks. The CX-2 has two timers: a stop- watch that counts up, and a count down timer. The stopwatch can be used to keep track of elapsed time or to determine the time required to fly a known distance. - Page 8 CONTRAST CX-2 keypad Figure 2: Changes display to the previous menu. Used to navigate about the menu struc- ture. When alternated with , darkens and lightens display screen (toggle between until the desired shading is achieved). Selects highlighted menu item, enters current input line when function is requesting input.
- Page 9 Decimal point. Completes the calculation. Resetting: To reset the CX-2, remove all of the batter- ies. This will clear all stored information. The FAA requires that all the memory in an electronic flight computer be cleared prior to use during FAA...
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Page 10: Getting Started
When first turned on, the CX-2 is in calculator mode with **Calculator** displayed at the top of the screen. The CX-2 can be returned to this mode at any time by pressing the key. Each time the computer returns to the calculator mode, an internal test checks the battery power. -
Page 11: Conversions
(nautical miles per hour). Many aircraft, especially older ones, have their airspeed indicators and flight manual set up for statute miles. The CX-2 allows you to convert to nautical easily. For example, to convert 180 MPH to knots, key in: You will get an answer of 156.4157 knots. -
Page 12: Statute To Kilometers
The answer is 370.4 KPH. Kilometers to Statute Statute to Kilometers The CX-2 does not have a function that allows direct conversion of statute miles and kilometers. However, since both can be converted to and from nautical units, you can “chain” two conversions with an interim answer in nautical. -
Page 13: Kilograms To Pounds
The answer is 26.4172 gallons. H.h to HH:MM:SS HH:MM:SS to H.h The CX-2 can display time in two formats: hours, min- utes and seconds separated by colons (HH:MM:SS), or hours only (H.h, e.g., 2 hours, 30 minutes is displayed as 2.5 hours), and it can convert from one mode of dis- play to the other. -
Page 14: Celsius To Fahrenheit
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 display can be easily converted to an H.h format. To convert the 02:31:00 in the current display, key in: The display will be 2.516667 hours. The maximum time in HH:MM:SS mode is 99:59:59. -
Page 15: Millibars To Inches/Inches To Millibars
To convert 29.78 inches of mercury to mb, enter The answer is 1008.467 mb MENU SYSTEM The CX-2 menu system is organized to reflect the natu- ral order of flight. Simply work through the menus in sequential order as you complete your flight plan. - Page 16 All functions are within 3 clicks. The calculator is Figure 3: organized for easy navigation and follows the logic associated with flight planning of a typical flight. The computer will prompt you for the inputs, and the answers will display below the double line at the bot- tom of the screen.
- Page 17 Rate and Fuel. The CX-2 will convert any headings exceeding 360 to remain within 360°. For example, if you enter 390 for any heading, the CX-2 will change this to 30 once you press . All math and conversion functions can be carried out on any input line.
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Page 18: Calculator
The sign of any number can be changed with the key. With the CX-2 turned on, add the numbers 123 and 456 by pressing: The number 579 will be displayed. Now press... - Page 19 the standard atmospheric pressure at sea level, 29.92'' Hg. PAlt is required to calculate true airspeed (TAS) and density altitude (DAlt). The Press Alt function calculates PAlt, given the indicated altitude (IAlt) and altimeter setting (Hg) obtained from the automated flight service station (AFSS) or Air Traffic Control (ATC).
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Page 20: Density Alt
Density Alt In aviation calculations, air density is normally speci- fied by an altitude in a standard atmosphere, instead of pounds per cubic foot. The altitude corresponding to a given density is called the density altitude (DAlt). The Density Alt function computes DAlt based on PAlt and the outside air temperature (OAT). -
Page 21: Cloud Base
for the standard atmosphere. The Std Atmos function is valid up to 200,000 feet. What are the standard atmospheric condi- Problem: tions at sea level? Press the key. Select the Altitude sub- Solution: menu by pressing or highlight the Altitude line (or if continuing from the previous example, press return to the Altitude menu). -
Page 22: Airspeed
At approximately what altitude above the Problem: surface can the pilot expect the base of cumuliform clouds if the surface air temperature is 82°F and the dew point is 38°F? Press the key. Select the Altitude sub- Solution: menu by pressing or highlight the Altitude line (or if continuing from the previous example, press return to the Altitude menu). -
Page 23: Plan Tas
during ground operations, and use “Act” airspeeds for in-flight calculations, where TAT is available. Plan TAS The Plan TAS function computes the true airspeed (TAS) for a planned calibrated airspeed (CAS). The inputs to this function are Planned CAS, OAT, and PAlt. It is important to use the OAT and PAlt at the planned flight altitude. - Page 24 The inputs to this function are CAS, TAT, and PAlt. The Act TAS function calculates TAS, OAT (which can be used as an input to Plan TAS and Req CAS functions), and Mach Number (MACH). Compute the TAS at 6,500 feet PAlt, +10°C Problem: TAT, at a CAS of 150 MPH.
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Page 25: Plan Mach
(or if continuing from the previous example, press to return to the Airspeed menu). Press to select the Req CAS function, press: to enter 150 knots TAS, then: to enter -5°C OAT, and press: to enter 6,500 feet PAlt. The display will show 138.1 kts CAS, -2.04°C TAT, and 0.2351 MACH. -
Page 26: Fuel
Act MACH# The Act MACH# function computes true airspeed using information from instruments during an actual flight. The inputs to this function are Actual MACH, and TAT. The Act MACH# function calculates TAS, and OAT. Compute the TAS given 0.82 MACH with Problem: -20°C TAT. -
Page 27: Fuel Rate
to enter 1:14:38 Dur, and then: to enter 9.5 Xph Rate. The display will show 11.8X Fuel. The unit X can be gallons, liters, or pounds as long as the same unit is used for the Rate and Fuel. In this problem, the rate was 9.5 gallons per hour so the answer is 11.8 gallons. -
Page 28: Plan Leg
How much flight time do you have with 38 Problem: gallons of fuel on board, and a power setting that gives a fuel burn rate of 9.5 gallons per hour? Press the key. Select the Fuel sub- Solution: menu by pressing or highlight the Fuel line (or if continuing from the previous example, press return to the Fuel menu). -
Page 29: Hdg/Tas
to enter 155° TCrs, then press: to enter 125 kts TAS, then: to enter 350° WDir, and: to enter 15 kts WSpd. The display will show 153.2° THdg and 139.4 kts GS. Hdg/TAS Occasionally it is necessary to arrive at a checkpoint at a specific time. -
Page 30: Compass Hdg
to enter 143 kts GS, then press: to enter 250° WDir, and: to enter 25 kts WSpd. The display will show 0.6° THdg and 132.3 kts TAS. You should fly a heading of 001° at 132 knots. Compass Hdg This function is used to account for the inherent inac- curacies of the compass, caused by the difference between the direction indicated by the magnetic com- pass and the true north pole (magnetic variation), as... -
Page 31: Leg Time
to enter the westerly variation (east is least, west is best: enter a positive number for a westerly variation and a negative number for an easterly variation), and press: to enter the deviation. The display will show 211.0° for the CHdg. Leg Time The Leg Time function computes the time duration of a leg given its distance (Dist) and ground speed (GS). -
Page 32: To/From
What is your ETA if you plan to depart at Problem: 9:30 a.m., for a 2.5 hour flight? Press the key. Select the Plan Leg sub- Solution: menu by pressing or highlight the Plan Leg line (or if continuing from the previous example, press return to the Plan Leg menu). -
Page 33: Act Leg
Act Leg Dist Flown The Dist Flown function computes how far you will fly (or have flown) given a ground speed and flight dura- tion. How far will you fly in 24 minutes at an Problem: average speed of 130 knots? Press the key. -
Page 34: Unknown Wind
Unknown Wind The Unknown Wind function allows you to compute the wind direction and speed during a flight. The inputs to this function are THdg, GS, TCrs, and TAS, and the outputs are WDir and WSpd. Find the wind direction and speed given Problem: 350°... -
Page 35: Gliding
runway number must be entered — not the course. The inputs are WDir, WSpd, and runway (RnWy) — it must be the runway number, not the heading. For example, runway 27 (not 270), and runway 9 (not 90). The outputs are crosswind (XWnd) — negative is a left crosswind, positive is a right crosswind;... -
Page 36: Glide Desc
An aircraft has a best glide ratio of 30:1. Problem: What is the maximum number of nautical miles trav- eled while losing 2,000 feet? Press the key. Select the Gliding sub- Solution: menu by pressing or highlight the Gliding line. Press for the Glide Dist function, then press: to enter the glide descent altitude and ratio. -
Page 37: Wt/Bal
The answer is a glide ratio of 27:1. WT/BAL The CX-2 performs all of the calculations necessary for proper aircraft loading. The first four items in the Wt/Bal menu are used to define the number of entries and the... - Page 38 Items will include such things as air- craft empty weight, pilot and passengers, fuel, and baggage. The CX-2 can calculate 9 items for any one problem. If you have more than 9 items, work 3 problems (one with half the items; one with the remaining items;...
- Page 39 2. Press , then to select the Wt/Mom Entry func- tion. This is where you enter the information for given items that provide moments (instead of arms). Press for the first item. Press the weight, and for the moment. This results in 101.40'' for the arm. 3.
- Page 40 If the given information provides for all arms, then you do not need to use the Wt/Mom Entry function. Likewise, if the given information provides for all moments, then you do not need to use the Wt/Arm Entry function. Given the information above, find the GW Problem: and CG if a 150-lb passenger exits the aircraft, and 50 lbs of fuel is added.
- Page 41 Continuing from the previous problems, Problem: now assume the 150-lb passenger moves to the front seat. Calculate the GW and CG given this weight shift. Press , followed by to select the Solution: Wt/Arm Entry function. The #Items/RF is not chang- ing, nor is the empty weight of the aircraft, so you do not need to review the first 2 submenus.
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Page 42: Clock
Coordinated Universal Time (UTC), also known as Greenwich Mean Time (GMT) or Zulu Time. You can set the Local Zone and the CX-2 displays both UTC and local time in a 24-hour format. To set the clock using Local time, you must set the local zone first. Tables 1 and 2 on the next page show the numbers of the time zones to specify when setting clock information. - Page 43 Table 1. United States standard UTC time zones Eastern Standard Time..........19 Central Standard Time..........18 Mountain Standard Time..........17 Pacific Standard Time..........16 Note: add 1 hour for daylight time. Table 2. Worldwide time zones Input Location (GMT) Casablanca, Monrovia, Dublin, Edinburgh, Lisbon, London Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna, Belgrade, Bratislava, Budapest, Ljublijana, Prague, Brussels, Copenhagen, Madrid, Paris, Vilnius,...
- Page 44 Adelaide, Darwin Brisbane, Canberra, Melbourne, Sydney, Guam, Port Moresby, Hobart, Vladivostok Magadan, Solomon Is., New Caledonia Auckland, Wellington, Fiji, Kamchatka, Marshall Is., Eniwetok, Kwajalein Midway Island, Samoa Hawaii Alaska Pacific Time (U.S., Canada), Tijuana Arizona, Mountain Time (U.S., Canada) Central Time (U.S., Canada), Mexico City, Tegucigalpa, Saskatchewan Bogota, Lima, Quito, Eastern Time (U.S., Canada), Indiana...
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Page 45: Timer
(17:30:00), since there is only a 1-hour difference be- tween the two zones. TIMER The CX-2 has two timers: a stopwatch that counts up, and a count down timer. The stopwatch can be used to keep track of elapsed time or to determine the time required to fly a known distance. -
Page 46: Stopwatch
Stopwatch The Stopwatch will count from zero to 99:59:59. Press followed by to access the Stopwatch. 1. Press (Run) to start the Stopwatch. 2. Press (Stop) to stop the Stopwatch. If you then press , the stopwatch will begin again from where it left off. -
Page 47: Appendix A: Sample Problems
APPENDIX A: Sample Problems Problems Solutions Math Review (2 + 63) · 3 = ________________________195 17 ÷ 6 = ____________________________2.833333 5 – 12.5° = __________________________-7.5 Time 2:30:00 + 00:37:30 = __________________03:07:30 8:30:00 – 5:15:00 = ___________________03:15:00 Conversions 52 SM = ______________ NM 45.18676 175 MPH = ____________ NM 152.0708... - Page 48 Altitude Press Alt Determine the pressure altitude with an indicated alti- tude of 1,380 feet MSL with an altimeter setting of 28.22 at standard temperature. 2,990 ft Density Alt Determine the density altitude for these conditions: altimeter setting 29.25, runway temperature 81°F , air- port elevation 5,250 ft MSL.
- Page 49 Act TAS What is your actual true airspeed with a total air tem- perature of 0°C, CAS 150 knots, and pressure altitude 25,000? TAS 234.1 kts, OAT -7.22°C, MACH 0.3684 ReqCAS What is the required calibrated airspeed with the TAS 145 knots, OAT 45°F , and pressure altitude 3,000? CAS 139.3 kts, TAT 9.99°C, MACH 0.2222 Plan MACH#...
- Page 50 Plan Leg Hdg/GS What is your true heading and ground speed given the following conditions: Wind 330° at 16 knots, course 165°, and TAS 145? THdg 166.6°, GS 160.4 kts Hdg/TAS What is your heading and TAS given the winds 250° at 20 knots, a course of 210°, and ground speed of 180 knots? TAS 195.7 kts, Hdg 213.8°...
- Page 51 Act Leg Dist Flown How far have you traveled if you have a 138-knot ground speed, and have been flying for 40 minutes? Dist 92.0 NM What is your ground speed if you traveled 10 NM in 00:01:22? GS 439.0 kts Unknown Wind What are the winds aloft if you are flying a 222°...
- Page 52 Glide Ratio A sailplane has lost 4,100 feet in 15 NM; therefore, glide ratio for this aircraft is approximately _________. Rat 22:1 Wt/Bal What is the CG and gross weight for the following con- ditions? (Use an RF of 1): EW .
- Page 53 % MAC What is the CG in %MAC given following conditions: MAC ..180.7'' CG ..891.27'' LMAC ..860.2 Answer: %MAC 17.2%...
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Page 54: Appendix B: Service Policy
Troubleshooting Visit the ASA website (www.asa2fly.com) for manual revisions, technical support, and FAQs for this product. 1. If the CX-2 screen display fails to illuminate, check for improperly inserted or discharged batteries. See battery replacement instructions. 2. The CX-2 screen is adjustable for display bright- ness. -
Page 55: Battery Replacement
1. Remove the battery cover on the back of the unit. 2. Remove old batteries and replace with new, in the same configuration as the old. 3. Slide the cover back on CX-2 until it clicks and fits flush with the back. -
Page 56: Limited Warranty
Limited Warranty Aviation Supplies & Academics, Inc. (ASA) warrants this electronic computer, Model Number CX-2, to the original purchaser for a period of five years from the initial date of purchase, against defects in material and workmanship. Batteries are not covered by this war- ranty. - Page 57 Record the purchase date in the space provided below. Refer to this when contacting ASA regarding this product. The CX-2 is an instruction and information aid, and is not an avionics instrument. Purchase Date: ________________________________...
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Page 58: Appendix C: Abbreviations Guide
APPENDIX C: Abbreviations Guide Act ........actual CAS ......calibrated airspeed CG . - Page 59 RnWy .......runway Std Atmos ....standard atmosphere TAS .
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Page 60: Index
INDEX abbreviations ......58 Act Leg ........33 Act MACH number . - Page 61 FAA Knowledge Exams ....5, 9 Fahrenheit to Celsius ..... . .14 feet to meters .
- Page 62 leg time ....... . .31 liters to gallons ......13 low battery .
- Page 63 time zones, worldwide ..... .43 timer ........45 To/From .
- Page 64 NOTES...
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