The question of Rickredline is much more interesting than what someone could think at a first impression.
The presence of "Tunguska" (in particualr M/M1 version) among the air defence systems of Libya ,even accounting for a typical downgraded export model, would have represented a very,very big complicating factor for NATO plans ,and not because it would have respresented an immediate threat for fixed wing NATO aircraft -it is a short range, point defence AD system- ,but because it would have represented the first AD system ever confronted by Western Air Forces capable to engage cruise missiles and in a very efficient way ; under this point of view it would have represented a true "allowing " element for the other segments of the obsolescent Libyan air defence structure.
Anyone, in particular those with specific knowledges on this type of subjects, will have likely noted how this air campaign has begun in the same, identical way of any other in the last 20 years ago : employement of a barrage of cruise missiles against the sites hosting the fixed long range/high altitude air defence systems .
In this conflict this truly crucial first part of the operations is even more important, for the problem represented by Lybian SA-5 which, in spite to being surely a very outdated and scaled down export version , would have rendered a lot of missions ,among which SEAD stand-off jamming operations, OCA for intruding strike elements, first line CAP , AWACS missions etc....) incredibly hard and risky to conduct.
Returning at the actual scenario we have that in the first 29 hours of operations , the "Coalition of the Willing " has employed 124 Tomahawk against 22 Libyan long range fixed SAM sites , an average of 5,6 at site .
Six Tomahawk wouldn't have been simply an easy ,but even an offensively easy target for a battery of Tunguska (6 launcher ) placed at defence of similar targets ; a subsonic cruise missiles are ,in fact , pratically the easiest target to engage for a system like Tunguska -M/M1: slow ,clumsy ,re-engageable several times and totally uncapable to react ,in any way, to interception ; at the point that except in massive attacks (35-40 cruise missiles in transition in the defended area in a very small time window ) only the twinned 2A38M 30 mmm cannon are employed for theirs suppression .
This is a video on the system ; you can see interception of a cruise missile at 5:17 - 5:24.
[nomedia="http://www.youtube.com/watch?v=KUc8iJ0QvEs"]YouTube - Tunguska-M1[/nomedia]
Note that batteries not allocated at protection of specific targets (SA-5 sites, C3 stations , airfields etc..) would have represented true walking-mines when present in the most probable attack's pact of groups of long range PGMs .
Likely ,even excluding in-travel interception by part of detached batteries , the coalition would have been forced to employ the same costly and limited resource for engage only few SA-5 sites ,and the effect most probable would have been only the quick and momentary undeployement of the SAM site so massively attacked .
When you add to a side a new capability , almost always the effects on the entire branched chain of different element interactions is never linear but exponential.