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Boeing 747 Photo Question

Thu Jan 31, 2002 5:33 am

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Photo © Kjell nilsson

I just wanted to know what is that bump on the top of this Boeing 747-100 not the hump where the passengers and the cockpit is but there's like a grey circle with a bump. It can also be seen if you look on top of Dutch. Does anyone know what it is or is it just dirt?
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RE: Boeing 747 Photo Question

Thu Jan 31, 2002 6:23 am

A wild and uneducated guess: It's some sort of satellite antenna contained in a de-electric (glassfibre) container.

Probably for pax pay-phones, maybe GPS, maybe both.

Regards, Preben Norholm
Always keep your number of landings equal to your number of take-offs
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RE: Boeing 747 Photo Question

Thu Jan 31, 2002 10:51 am

Keep in mind that the picture was taken in 1972! That rules GPS, and probably pax pay-phones out.  Smile

In any case, I believe this has been discussed before, so someone should be able to come up with the right answer soon enough.

Pacifism only works if EVERYBODY practices it
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RE: Boeing 747 Photo Question

Thu Jan 31, 2002 4:27 pm

Its an old SATCOM (satelite (sp?) communications) antenna. My understanding was that it was all the rage in the early to mid-seventies, but never went anywhere.
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RE: Boeing 747 Photo Question

Fri Feb 08, 2002 1:01 am

Most pre -75 built 747s carried this antenna case, but it cannot have been such an important antenna system. By far the most of these 747s were modified from the mid 70s on and this (ugly) small hump was replaced. Today there is just one 747 left worldwide with this device (a 747-282B of PIA).

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