Small Mound On 747-100 Empennage. What Is It? — Civil Aviation Forum

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Small Mound On 747-100 Empennage. What Is It?

Sulman From United Kingdom, joined Mar 2004, 2028 posts, RR: 35
Posted (8 years 5 months 3 weeks 4 days 20 hours ago) and read 2414 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

more like polishmig29s.net am I rite

9 replies: All unread, jump to last

By738 From US Minor Outlying Islands, joined Sep 2000, 1982 posts, RR: 1
Reply 1, posted (8 years 5 months 3 weeks 4 days 20 hours ago) and read 2369 times:

Isnt it some sort of communications radome ?

VgnAtl747 From United States of America, joined Apr 2001, 1492 posts, RR: 2
Reply 2, posted (8 years 5 months 3 weeks 4 days 20 hours ago) and read 2353 times:

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

Work Hard. Fly Right. Continental Airlines

Vikingair From United States of America, joined Aug 2004, 100 posts, RR: 0
Reply 3, posted (8 years 5 months 3 weeks 4 days 19 hours ago) and read 2277 times:

Elevator for supplies to upper deck.

Radarcontact From , joined Dec 1969, posts, RR:
Reply 4, posted (8 years 5 months 3 weeks 4 days 18 hours ago) and read 2258 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.

Radarcontact From , joined Dec 1969, posts, RR:
Reply 5, posted (8 years 5 months 3 weeks 4 days 18 hours ago) and read 2245 times:

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

Sulman From United Kingdom, joined Mar 2004, 2028 posts, RR: 35
Reply 6, posted (8 years 5 months 3 weeks 4 days 18 hours ago) and read 2210 times:

Here's another example:

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Photo © Stephen John Rendle

more like polishmig29s.net am I rite

Air2gxs From , joined Dec 1969, posts, RR:
Reply 7, posted (8 years 5 months 3 weeks 4 days 17 hours ago) and read 2152 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.

Na From Germany, joined Dec 1999, 9609 posts, RR: 10
Reply 8, posted (8 years 5 months 3 weeks 4 days 12 hours ago) and read 1931 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).

Meister808 From United States of America, joined Jan 2000, 972 posts, RR: 1
Reply 9, posted (8 years 5 months 3 weeks 4 days 11 hours ago) and read 1869 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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