Turning a transponder off rarely happens in a formation the lead would be active whilst the others are in standby. Whilst it may happen much like a miscoded civilian aircraft it’s technically against European regulations. The presence of duplicate 24-bit addresses can jeopardise the safety of aircraft and the operational efficiency of ATM (air traffic management) functions, and must therefore be avoided at all times“ When Mode S transponders are used in flight, unique and correctly assigned aircraft addresses must be used. The 24-bit addresses must not, however, be rotated during flight. The controlled rotation of 24-bit addresses is not therefore considered to be contravene the above principles. The purpose of this random changing of addresses is to conceal information concerning military airframes which might allow an air order of battle to be accumulate. The relatively large number of aircraft addresses earmarked for military use allows frequent rotation of the assignment of 24-bit addresses to military aircraft. “In NATO (North Atlantic Treaty Organization) member States, authorities have earmarked for military use a proportion of the 24-bit aircraft addresses available to them. It's already the case for cargo ops that multiple dispatch centers makes even hading out unique flight numbers problematic. My guess as to why they don't do it more often is a combination of workload, training, and coordination.
#Planeplotter code code
I think it's interesting that they chose a code space that's under their own allocation (and rather close to the current blocks allocated to new aircraft coming online) for it. Depending on the equipment used, it can be as easy to change the code as it is to change the FlightID in civilian products.īringing this back to the current thread, my guess is this was an emergent tactic to slow down the public I would not be surprised if we don't see it again, or if we see it in a slightly different manner. The only way of a hex changing in flight is if the second box is miscoded to the first.As others have noted, this can - and does - happen. I believe the current agreement with Eurocontrol (for instance) is that they can use a section of unused number space in any way they see fit and turning off their transponder completely is the functional equivalent of declaring DUE REGARD. so there's no rule to break, technically. They have historically negotiated "rules of engagement" with various ATC centers (FAA, Eurocontrol, Transport Canada, etc.). Military aircraft are not allowed to change hex during flight, there is no regulation that allows this.Military/state aircraft are not bound by ICAO regulations. Do they swap them around ?Ĭan anyone help with the following P8 Hex codes, all three seen today.
I already have 169004 listed as being hex AE57C9.
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