In these helicopters, there are two different single plug connections. The only confusing part is that some helicopters also have a 6-pin (or LEMO) plug. This is not like the 6-pin plug above, however, since an ANR helicopter headset will still need AA batteries. Helicopter plug - helicopters use a single, shorter plug (that is not compatible with airplanes).For these applications, you'll need to have your avionics shop wire in the plug - not a big job, but not something pilots can do on their own. While many newer airplanes come with this option, most older airplanes do not. This is convenient, but it does require the 6-pin plug to be installed in the panel. Aircraft powered, 6-pin plug - the second most popular style, sometimes called the "LEMO plug," requires no batteries since it is powered by the panel.The only downside is that, for ANR headsets, you will need to use AA batteries to power the headset. Almost every airplane ever built has these two plugs in the panel, so these headsets are universal. Battery powered, twin plugs - this is by far the most common style, with separate microphone and headphone plugs (so-called PJ plugs).Choosing the right one is pretty easy, it just depends on what type of aircraft you fly: Most headsets come in multiple cable configurations.
Airport-Facility Directory (Chart Supplement).
Terminal Procedures Publications (Approach Plates).
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