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ASA CX-2 Flight Computer FAQ


• Why do I often get slightly different results when comparing the CX-2 to manual calculations ?

The difference you're finding in the numbers reflects the small variations in the definitions of "standard" atmosphere that you will find throughout the industry. You'll notice that some charts produced by the FAA differ very slightly from some commercial charts showing lapse rates and pressure/altitude relationships.
Physically speaking, atmospheric pressure and temperature changes at altitude are not linear and the actual formulas to estimate them are quite complex.
To help clarify the situation, the CX-2 is a binary device that records information in decimal notation. This will occasionally cause some issues of rounding. For the same reason, prior entries may be displayed slightly differently than what you originally entered. This again is binary storage and rounding.
The display can show up to eight decimal digits, however, the chip in the CX-2 has a maximum accuracy of seven digits. In some cases, the eighth digit will be rounded.
For all these reasons, there may be some small variances between altitudes calculated using 'rules of thumb' and different models of commercial aviation calculators.

• Are batteries included with the CX-2 ?

Yes, the CX-2 comes with 4 AAA batteries at no extra charge.


• What advantages does the CX-2 have over other electronic flight computers ?

ASA's CX-2 provides access to 40 aviation calculations (including weight and balance). It also computes standard atmosphere, cloud bases, Hdg/TAS, compass hdg, ETA, To/From (reciprocals), glide distance, glide descent, and glide ratio. Not only that, but the CX-2 performs 16 different conversions (including millibars to inches/inches to millibars), and includes a stopwatch.


• Can I use the CX-2 for my FAA Knowledge exam ?

Yes, the CX-2 is approved for FAA and Canadian exams. You will be asked to clear the memory before starting your test.

• Do you still make the CX-2 with "Light/Dark" above the arrow keys instead of "Contrast" ?

No, the newer models say "Contrast". Consumer feedback indicated that some people were mistaking the Light button for an actual light on the display.

• Why can't I get the clock to convert time from my time zone to UTC time ?

The CX-2 is programmed for standard time, not daylight time. It will always convert from standard time to UTC time by subtracting 8 hours. In order to determine UTC time during daylight time (summer) you must change the “Zone” to the NEXT zone listed in Table 2, pages 43 and 44 of the Instruction Manual.
Example: If you are in the Pacific time zone during daylight time (summer) you will need to set the zone to "17" instead of "16". When we go back to Standard time in the fall, you can re-set the zone to the proper code shown in the book. This is because the CX-2 does not know when we set our clocks forward or back.

• Is it possible to add time increments together using the CX-2 ?

Yes, there are a couple of ways to do this: Calculator mode -

02:35:00 + 01:40:00 = 04:15:00

·         key "2:35 enter" - the display will show 02:35:00

·         key "+" - the display will not change

·         key "1:40 enter" - the display will show 01:40:00

·         key "=" - the display will show 04:15:00

To perform the same function digitally, converting to and from decimal format:

·         key "2:35 enter" - The display will show 02:35:00

·         key "2nd" then "x" - The display will change to 2.583333

·         key "+ 1:40 enter" - The display will show 01:40:00

·         key "2nd" then "x" - The display will change to 1.666667

·         key "=" - The display will show the sum 4.25

·         key "2nd" then "6" - The display will convert to 04:15:00

• Is it possible to change the default unit of measure when doing calculations ?

No, it is not. Calculations such as weight and balance default to pounds and inches. Conversions must be made when you input the data. However, in the case of determining something such as a "moment", the calculation is still a basic multiplication problem. If you input numbers in pounds and inches, your result will be pound-inches. If you choose to enter in kilograms and meters, your answer will be in kilogram-meters, despite the units displayed. (X) x (Y) is always going to be (Z).


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