Thick Heavy Black Smoke
Hello,
I was watching a G4 take off. From the engines spooling up to, till as far as I can see her disappear, I can see thick trail of black smoke out of both engine. It used a good amount of rwy so knowing she's heavy I realise. Can someone explain what this usually means? I was first thinking maybe that's an indication of service times are coming up. What else? This is got me curious.....