Rings on 757 Noses

[Colonel Gimble]

Could someone please tell me the reason why BA 757's and some 737's have a black ring painted on the nose/radome?

Thanks

CG:ok:

[forget]

They were (are?) trials aircraft for the Micro-Wave Landing System. MLS.

[Colonel Gimble]

Thanks for that! :)

[NavMonkey]

I recall that -KK (757) and -WB (767) were used in the MLS trials but don't recall any 737's. Was there anything else that they may have been painted up for?
Cheers, NM

[Bus429]

I thought MLS trial aircraft had "C of G" type patterns on the radome. Last saw KK with DHL; MLS antenna was still fitted.

[Felix Saddler]

What is the benefit in using Micro wave signals?

[3bars]

MLS signals can be bent.....around corners or over terrain. No need for a ten mile straight ILS

[forget]

Here............http://en.wikipedia.org/wiki/Microwave_Landing_System

[Piper19]

BIKK still has the MLS antennas, but nothing is connected to it.

[sinkingship]

MLS trial aircraft had the black/white quater filled circle like a CofG cymbol as stated.
the black ring i beleive is for connecting the bonding strips within the radome.