Testing was completed by 1980, and by 1982 the autothrottle had been devised to link the FMC to the throttle. so technically, the 727 has a good claim to being the first aircraft to ever have an FMC.At that time (late 70s) it was called the PDCS (Performance Data Computer System), but there was no such thing as an autothrottle for the 727 back then (or any other Boeing for that matter), so the PDCS only controlled a few parameters, and most of that was by means of 'advisaries' by moving motorised bugs on the dials rather than actual automated control, the main things which had that happen being the EPR and ASI although the system also advised on the best flight level to be at for maximum fuel economy.All of that stuff resulted in the 727-200 showing about a four percent improvement in fuel economy when using the system. But pressing q and unmuting it helps me.Few Boeing 727s were ever really fitted with a true FMC and I personally prefer it without one, which is ironic because the B-727-200 was one of two aircraft types (the other was a 737-200ADV) which Boeing and Lear Seigler used to trial the very first of what would later be called the FMC. I also get it on the ground but when parked at the gate, I hear engines and im completely shut down. I would like to figure out how to permanently get it to stop because usually I can only hear the packs and no engine sounds when it does that. But what fixes it for me is to mute the sim, then unmute, (mute by pressing "q").
I actually have recently switched from FSX to P3D and have had this exact problem in both sims. I do not have this issue in other airplane, just PMDG 737/777. If I check headphones config in Windows (10) I still can hear test sounds in my headphones. It works normal for about an hour or two in flight then cockpit sounds disappear. However headphones still works (I think). I decided to have ATC and NGX/777 cockpit sounds via the headphones and engines and everything else via speakers. I was tired of loud windy noise (not sure if it is engines or external noise) so I had hard time to hear and understand air controllers. I had all my sounds routed via headphones and headphones was shown as primary sound device in PC, P3D4 and vPilot settings.
I have Steelseries wireless headphones and I never had issues till I started making changes to my audio settings. I am trying to narrow down the cause of this issue.
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