This seems to be an established term, a pilot's "fitness to fly" -> http://www.experimentalaircraft.info/articles/human-factors-...

Another option for 'einsatzfähig' in this context might be -> 'being available', however, my choice is -> fitness to fly.

We use the term "currency" in the UK to indicate that a pilot's licence validations (certificate of experience), type ratings and medical certificates are up-to-date allowing him/her to fly the aircraft originally qualified for.

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Note added at 1 hr (2009-11-07 08:39:00 GMT)
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On second reading I am, however, puzzled by the "für" in the German sentence. To me the sentence only makes sense if it is "durch": An instruction on type by a fully qualified and current instructor is required. I do not perceive a scenario where a "type rating for" an instructor would be required since it is the instructor who would sign the pilot off for the type rating. Only the context can indicate whether this preposition is an error or intended.

operational

To my understanding, a) neither 'deployable' nor 'operational' are suitable adjectives for human beings and b) this is not about teachers being fit to fly and ready to teach pilots, although the paragraph opens with the word "pilots".
As far as I understand the text, it says that in case a new set of airplanes is offered, in such case, the instructors (those who will teach the pilots) need to undergo some kind of instruction - at the condition that they already are fully eligible and fit to work.

ausgebildet und einsatzfähig trained and qualified

'Einsatzbereit' or 'einsatzfaehig' can be used generally for any worker capable of doing a job or professional capable of accepting an assignment. In the sourec sentence given, it refers to the pilots, thus 'ready to work,' 'ready to fly' or 'flight ready' might be good equivalents. Were the reference to the aircraft, then 'flight worthy' would perhaps be the best translation.