Sennheiser interference from window heat
Hi
I have a Sennheiser HMEC 45-KA active noise cancelling headset which has an annoying problem. I'm an FO and therefore sit in the RHS of the 737-800 I fly. When I turn on the active noise cancelling I get (around 25% of the time) an irritating beeping and interference in my left ear.
I've tried adjusting the mic sensitivity but it doesn't appear to have worked. It gets worse as I turn my left ear towards the window so I'm guessing it's the window heat which is causing it. By touching any metallic part of the flightdeck with my hands it reduces the noise - e.g. touching the switches on the overhead panel.
By pressing the earpiece firmly I can get rid of it for 30 mins or so but it almost always comes back.
Does anyone have any suggestions?
Thanks a lot!
SkyFlyer737