Radarcontact From , joined Dec 1969, posts, RR:
Reply 4, posted (9 years 8 months 1 week 12 hours ago) and read 3598 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.
Air2gxs From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 8 months 1 week 11 hours ago) and read 3492 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, 10657 posts, RR: 9
Reply 8, posted (9 years 8 months 1 week 5 hours ago) and read 3271 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).