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Boeing 747 Photo Question  
User currently offlineB7474 From United States of America, joined Mar 2001, 259 posts, RR: 0
Posted (12 years 7 months 3 weeks 2 days 5 hours ago) and read 2556 times:


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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?

4 replies: All unread, jump to last
 
User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6451 posts, RR: 54
Reply 1, posted (12 years 7 months 3 weeks 2 days 4 hours ago) and read 2426 times:

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, Preben Norholm
User currently offlineLY744 From Canada, joined Feb 2001, 5536 posts, RR: 9
Reply 2, posted (12 years 7 months 3 weeks 2 days ago) and read 2362 times:

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.

LY744.



Pacifism only works if EVERYBODY practices it
User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 3, posted (12 years 7 months 3 weeks 1 day 18 hours ago) and read 2325 times:

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.

User currently offlineNa From Germany, joined Dec 1999, 10735 posts, RR: 9
Reply 4, posted (12 years 7 months 2 weeks 1 day 10 hours ago) and read 2113 times:

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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