Air Cobras

[Mobhack]

Well, I can be mistaken but the principles of IR jammers (chaffs, flares, some decoys etc.) for land and air units are mostly the same.
So here's the Mobhack's Help quotation:
".....A value of 1 in this case is 1 shot of Arena active anti ATGM countermeasures, 2 is 2. 3 is 1 shot of Visual and Infrared Screening Smoke (VIRSS) which ejects anti TI smoke, possibly linked to an IR Jammer as well...."
I repeat, I can be mistaken, but it seems to be right way for aircraft/helicopter IR jammer's estimation in EW points.
And BTW - Could you clarify for me the criteria of in-game EW estimation? What is it based on?

I know what the Mobhack help states, since I wrote the help for my editor. So - please read the complete paragraph from the help file, with the the important bit being highlighted in bold:

EW - Electronic Warfare value. Mainly used for AA vs aircraft capability. For non flak on map units which are vehicles, the field is used for special countermeasures devices. A value of 1 in this case is 1 shot of Arena active anti ATGM countermeasures, 2 is 2. 3 is 1 shot of Visual and Infrared Screening Smoke (VIRSS) which ejects anti TI smoke, possibly linked to an IR Jammer as well. 4 is 2 VIRSS shots. This field changes colour and displays a note when VIRSS or Arena are valid.

So as I said in the post you replied to, an EW number is simply a number where a 1 is better than a 2, in the case where the EW is being used for its normal usage. That is as a defensive AAA value (on planes) or as an offensive item (flak or AAA). Not as a special usage for land units anti-ATGM (or artillery observer fire control which is another dual use of the EW field).

Try looking at an MBT with a 3 or 4 in the EW field in Mobhack - the field is highlighted in blue text and a text string for VIRSS is displayed. A helicopter or a SAM or a plane does not have any such highlighting since it is not a special case usage of the EW field for non-AAA use.

Cheers
Andy