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B747 Antenna (?) Question  
User currently offlineViscount724 From Switzerland, joined Oct 2006, 29505 posts, RR: 24
Posted (8 years 12 months 4 days 14 hours ago) and read 2829 times:

Most if not all early 747s (both -100s and -200s I believe) had some kind of housing a few feet long on the upper fuselage at the extreme rear of the upper deck (where the upper deck meets the rest of the fuselage). It's clearly visible in the first photo below. Some years later it was removed. The second photo is of the same aircraft many years later and it is gone.

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Photo © Art Brett - Photovation Images
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Photo © Philippe Samson

I'm curious what purpose that "hump" served and why it was later removed. I'm guessing it was an antenna of some kind. I did a search but couldn't find anything.

2 replies: All unread, jump to last
User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 1, posted (8 years 12 months 4 days 14 hours ago) and read 2822 times:

It was an antennae housing, but I forgot what antennae was inside of it. Someone asked this very question in an issue of Airliners Magazine, but that was long ago...and I don't know what happened to the issue.

User currently offlineN8076U From United States of America, joined Jun 2006, 425 posts, RR: 7
Reply 2, posted (8 years 12 months 4 days 12 hours ago) and read 2787 times:

The bulge was for an early SATCOM setup.


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