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RetiredF4's avatar

Thank's for this piece of work. I'm keen to add my 5 cents.

Let me first clear a mix up which is very common. A primary radar contact is the depicted return of a target illuminated by a primary radar system, while the secondary radar return is the depiction on the radar scope of the digital information provided by the IFF system to a secondary radar system. Civil ATC is basically using only secondary radar information, while the military still uses both systems. The reason is obvious, secondary radar informations depends on the aircraft answering the identification request by secondary radars, the signal can be recorded by EW equipment . And if there is no own aircraft in the respective area , it must be hostile irrespective wether the IFF code itself can be identified or not.

That is the neat thing of a functioning IADS, where all gathered information in a designated airspace is identified, tracked and communicated with secure link to all ground and airborne assets.

A primary radar return can be identified and tracked by such a system by many means, all safe and without the use of IFF. Once a flight is planned the IADS system has to get the info about the point of departure, estimated time of departure, number of aircraft and the planned mission / target area. Based on the air and ground situation this flight gets assigned a safe deconflicted vector and altitude which have to be followed.

Upon takeoff the control tower forwards the information to IADS and the aircraft can be identified upon departure by primary radar alone.

My point is, IFF is useless and dangerous to use if unfriendly things are around you which strive to find and identify and finally shoot at you.

For me in my humble opinion the unknown black box is the capacity and ability of the IADS system, in a saturated situation the ability to identify and keep track of many targets may lead to disaster. Would I switch on my IFF in such a situation? No, as long as the bad guys are ready to squeeze the trigger. Especially over own ground a pilot has to rely on the system, that he is positive identified as friendly until somebody tells him otherwise by a call like "contact lost", and thus his radar return would be marked as " unknown". The controller would initiate an identification process, which could be a simple command to maneuver the aircraft to an new assigned heading/ altitude or as last resort to use the IFF.

Back to the case in hand, no General gets fired when a pilot or an operator of a Patriot makes a silly though deadly and expensive mistake, but he needs to get fired when the failure is to be found in the system and its setup. Neither the pilot nor the operator of an air defence system operates on their own, except in a kind of self defence mode when under direct attack. Both should have had a clear picture of friend and foe. The pilot had to rely on the system, that he was identified as friendly. He is not outside there flying alone and searching for targets and engaging them on own will, especially above own territory with many different air defence systems engaging as well he will be under close control of a ground or air based control station which assigns the targets and clear him to engage. He could have done nothing to avoid getting shot down by one of the most capable own missiles.

Same goes for the operator of a patriot system, it will not operate in autonomous mode and shoot at will at unidentified aircraft, except if under attack for self defence. If it is true that the F16 was hunting shaheds, the situation gets even more weird. Shooting with patriots on shaheds is hopefully not happening, waste of money and resources.

Lastly, we speculate a lot and know not enough, but this General got fired for a reason, a grave hopefully temporary misconception of the IADS system setup.

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John Webb's avatar

Ye-eee--s, I got (most) of that. From now on I will keep my transponder close to my thumb reading your explanations. The adrenaline rush has begun to subside, time for a palate cleanse (Jeff Tiedrich works for me)?

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