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What are the three vertical lines on the MD-11 radome?

Posted: Thu Sep 02, 2021 3:00 am
by convair880mfan
On head on photos of the MD-11, there are three metallic vertical lines. They are evenly spaced. Does anyone know what they are and what their function is?


Re: What are the three vertical lines on the MD-11 radome?

Posted: Thu Sep 02, 2021 4:13 am
by fr8mech
Lightning strips or diverters. In theory they reduce the damage done by lightning strikes.

Re: What are the three vertical lines on the MD-11 radome?

Posted: Thu Sep 02, 2021 4:16 am
by acmx
Lightning diverter strips. They provide a path for electricity to travel across the composite radome.

Re: What are the three vertical lines on the MD-11 radome?

Posted: Thu Sep 02, 2021 5:06 am
by convair880mfan
Thanks for that information. I kind of suspected something like that. I'm surprised they don't affect the functionality of the radar but I guess if they did, they wouldn't be there. Thanks again.

By the way, why are the capital letters CB above the middle flight deck windows?

Re: What are the three vertical lines on the MD-11 radome?

Posted: Thu Sep 02, 2021 5:14 am
by Starlionblue
convair880mfan wrote:
Thanks for that information. I kind of suspected something like that. I'm surprised they don't affect the functionality of the radar but I guess if they did, they wouldn't be there. Thanks again.

By the way, why are the capital letters CB above the middle flight deck windows?


CB are the last two characters of the tail number, in this case PH-KCB.

Such markings are for ground staff so they can have an easy reference as they can't see the registration markings from the terminal. More common is to have the last two characters painted on the nose gear doors. The actual registration markings are waaay up there and not easy to see when you're up close.

Re: What are the three vertical lines on the MD-11 radome?

Posted: Thu Sep 02, 2021 5:24 pm
by e38
convair880mfan wrote:
why are the capital letters CB above the middle flight deck windows?


convair880mfan, in addition to aircraft ship number or registration on the nose gear doors, forward side of the fuselage, or above the flight deck, some airlines also paint the specific type of aircraft, i.e., 737-800, A330-200, etc, on the lower fuselage just below the radome. This will correspond with painted markings on the ramp to assist aircraft marshalers with proper jetway alignment as the aircraft approaches the gate area.

e38

Re: What are the three vertical lines on the MD-11 radome?

Posted: Tue Sep 21, 2021 11:31 am
by HAWK21M
Any reason for the Vertical Lightening diverter strips compared the for aft type on the B737.

Re: What are the three vertical lines on the MD-11 radome?

Posted: Tue Sep 21, 2021 7:32 pm
by gregorygoodwin
These strips are not repairable locally if they are damaged, such as segments missing or de-bonded, which does happen. They are sent back to the manufacturer or a certified repair station. On our MD's, if the strips are damaged in some way, the radome is sent to Nordam in Tulsa, OK.
Gregory