Using a CX-2 to correct altitude for temerperature

[RVgrin]

The ASA CX-2 electronic flight computer seems to be able to do everything the E6B "Whiz Wheel" can, except for one. For the life of me I can't figure out how to get the CX-2 to perform "Altitude Corrections for Temperature".

Anyone know of a way, perhaps using a combination of other functions?

[RVgrin]

By the way, here is the E6B method from its manual:

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. Set pressure altitude next to outside air temperature in the altitude correction window.
3. Subtract station altitude from indicated/calibrated altitude to determine calibrated altitude AGL.
4. Find calibrated altitude AGL on the middle scale and read the correction to station altitude on the outer scale.
5. Add the correction to station altitude to get true altitude MSL.

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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. The difference between 5,000 feet station altitude and 12,000 feet indicated altitude is 7,000 feet. Opposite 7,000 feet on the middle scale read correction to station altitude (6,600 feet) on the outer scale—5,000 feet plus 6,600 feet equals 11,600 feet true altitude.

CAUTION: If the temperature between the surface and the aircraft does not decrease at the standard rate of 2°C per 1,000 feet or if the pressure at flight level is nonstandard, reliance on a computer solution to determine obstruction clearance can be very hazardous.

[Stochey]

On Iphone I got apps MyE6B and I can calculate the cold air temperature error and many other things that cx2 can't. Apps cost about 8$ or you can get it for free if you know how to jailbreak iphone !

[snoopy]

As far as I have been able to tell, and I've been using mine to study for an exam recently, the only temperature correction you can make is for density altitude. I was not able to find a way to calculate true or absolute altitudes either. I am however returning my CX-2 for warranty so maybe I'll that question in my notes as I had to use my Jeppesen CR-2 for questions requiring temperature corrections other than density altitude. Sometimes it can be really difficult to squint at the tiny little numbers in the window LOL so it would be nice to use the electronic calculator instead.

Alternatively you could email your question to tech support: support@asa2fly.com

Let us know if you find out any answers!

Cheers,
Kirsten B.