iPad2, Macbook air and iPhone 4S doesnt find/recognize HP photosmart 5510 printer ?

I would suggest starting with your MacBook Air.

The Photosmart 5510 is listed as supported by Apple. So I suggest setting it up under your MacBook Air as described in this Mac Print 101 article:

http://support.apple.com/kb/HT4670

Then hopefully your iOS devices will see it on AirPrint.

Greetings eskimo,

Has it worked previously, as in is this a new issue? If so, have you changed any software recently?

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I work with HP.