By avioniker on 26th August 2004.
Actually the black ring is a conductive strip for static dissipation. It's on all radomes but BA doesn't paint it over. Its effect is more for radio communication and to some extent lightning dissipation.
By Robert.humphrey on 26th August 2004
The BA 757 that had the trial MLS system had a black and white quadrant painted on the nosecone. The MLS system was for recording only, there was no indications or controls in the flight deck.
http://www.pprune.org/forums/showthr...hreadid=142244