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Small Mound On 747-100 Empennage. What Is It?  
User currently offlineSulman From United States of America, joined Mar 2004, 2037 posts, RR: 32
Posted (9 years 12 months 4 days 17 hours ago) and read 3885 times:


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Photo © Bob Garrard



Second time I've seen this - I'm referring to the small bump at the base of the empennage - anyone know what was in there?

Cheers


James


It takes a big man to admit they are wrong, and I am not a big man.
9 replies: All unread, jump to last
 
User currently offlineBy738 From Tonga, joined Sep 2000, 2420 posts, RR: 1
Reply 1, posted (9 years 12 months 4 days 17 hours ago) and read 3840 times:

Isnt it some sort of communications radome ?

User currently offlineVgnAtl747 From United States of America, joined Apr 2001, 1514 posts, RR: 2
Reply 2, posted (9 years 12 months 4 days 17 hours ago) and read 3824 times:

I would assume, as By738 said, that it is a communications radome of some sort.


Work Hard. Fly Right. Continental Airlines
User currently offlineVikingair From United States of America, joined Aug 2004, 100 posts, RR: 0
Reply 3, posted (9 years 12 months 4 days 16 hours ago) and read 3748 times:

Elevator for supplies to upper deck.

User currently offlineRadarcontact From , joined Dec 1969, posts, RR:
Reply 4, posted (9 years 12 months 4 days 16 hours ago) and read 3729 times:

I know KLM has some of it's 747's equipped with a sort of a weather station, which provides up to date weather reports over remote areas such as oceans. Don't know how it exactly works, but it looks like the bump (antenna) on this 747-100.

User currently offlineRadarcontact From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 12 months 4 days 16 hours ago) and read 3716 times:

Or maybe it's an additional antenna to enable contact between the aircraft's systems and the operations control centre?

User currently offlineSulman From United States of America, joined Mar 2004, 2037 posts, RR: 32
Reply 6, posted (9 years 12 months 4 days 15 hours ago) and read 3681 times:

Here's another example:


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Photo © Stephen John Rendle




It takes a big man to admit they are wrong, and I am not a big man.
User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 12 months 4 days 15 hours ago) and read 3623 times:

I assume you mean the bulge aft of the upperdeck, not at the base of the empennage. It is the old SATCOM (sattelite communications) antenna. The system, as I recall, did not gain very wide acceptance. It was supposed to supplement or even replace HF, but HF is still here.

User currently offlineNa From Germany, joined Dec 1999, 10804 posts, RR: 9
Reply 8, posted (9 years 12 months 4 days 9 hours ago) and read 3402 times:

On most 747-100s and early 747-200Bs (all 747s built up until the year 1974 had this small additional hump) this housing was removed in the later 70s or early 80s, mostly during the first D-check. Only very few 747s carried this distinctive hump to the end, like a single Pan Am jet, N749PA "Clipper Dashing Wave", scrapped in 1992, and one 747-200 of PIA which I photographed in the late 90s still with this device (that was AP-AYV or -AYW).

User currently offlineMeister808 From United States of America, joined Jan 2000, 973 posts, RR: 1
Reply 9, posted (9 years 12 months 4 days 9 hours ago) and read 3340 times:

For clarification:

Empennage=Tail section.

-Meister



Twin Cessna 812 Victor, Minneapolis Center, we observe your operation in the immediate vicinity of extreme precipitation
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