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Communications Equipment Bulge On Top Of Aircraft  
User currently offlineQatarAirways From Qatar, joined Sep 2008, 0 posts, RR: 1
Posted (11 years 10 months 4 weeks 1 day ago) and read 1647 times:

I have noticed many private aircrafts such as the Oman 747SP with a bulge on top of the fuselage. This holds some communications equipment. It is also found in some commercial aircraft like JetBlue's A320s so they can receive DirecTV transmissions.

No I have some questions:

-How do these bulges affect aero-dynamics?
-Are they installed as options from manufacturers or are they added later?
-Are they fitted on with heavy work such as drilling etc. or is it simple?

I also have noticed a sort of bulge on QR's A332.


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Photo © Garry Lewis



If you enlarge the picture you'll see that there is a sort of bulge in the top of the aircraft near the front section of the fuselage. Is this a bulge or part of a cloud in the background. If it is, is this normal in the A330s or is this a possible indication of Email/Internet or Live TV on board?

Regards,
QatarAirways
http://www.aviationgulf.com


7 replies: All unread, jump to last
 
User currently offlinePmk From United States of America, joined May 1999, 664 posts, RR: 2
Reply 1, posted (11 years 10 months 4 weeks 23 hours ago) and read 1633 times:

Okay,

First of all the OMAN 747SP's bump is not for communications, it is for a Chandelier! Let it not be said that these people make sacrifices....That bump is quite pronounced and probably does cause some drag, however in that role it makes little difference. Now the antennas on other aircraft are low enough to be under the A/C's boundary layer and cause almost no drag.


User currently offlineQatarAirways From Qatar, joined Sep 2008, 0 posts, RR: 1
Reply 2, posted (11 years 10 months 4 weeks 23 hours ago) and read 1631 times:



A chandelier, wow. Well I guess economics are not an issue with the Sultan. What I meant waws the bulge that you see on the JetBlue A320s




User currently offlinePmk From United States of America, joined May 1999, 664 posts, RR: 2
Reply 3, posted (11 years 10 months 4 weeks 21 hours ago) and read 1613 times:

Probably for inflight telephones.

User currently offlineQatarAirways From Qatar, joined Sep 2008, 0 posts, RR: 1
Reply 4, posted (11 years 10 months 4 weeks 21 hours ago) and read 1606 times:

I said:

"No I have some questions:"

What I meant was: "Now I have some questions:"

Just wanted to make things clearer


User currently offlineAWspicious From , joined Dec 1969, posts, RR:
Reply 5, posted (11 years 10 months 4 weeks 21 hours ago) and read 1605 times:

PMK;
Happy 3rd. anniversary here on Airliners.net  Big thumbs up

aw


User currently offlineLeezyjet From United Kingdom, joined Oct 2001, 4041 posts, RR: 54
Reply 6, posted (11 years 10 months 4 weeks 19 hours ago) and read 1581 times:

I always thought they were for the satellite telephones......

The bulge on the Oman 747sp, is quite a bit larger than those on commercial a/c like the one shown on the QR 330 pic above.


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Photo © Torsten Maiwald




"She Rolls, 45 knots, 90, 135, nose comes up to 20 degrees, she's airborne - She flies, Concorde Flies"
User currently offlinePW100 From Netherlands, joined Jan 2002, 2325 posts, RR: 12
Reply 7, posted (11 years 10 months 4 weeks 18 hours ago) and read 1582 times:

All KLM 744, 743 and M11 [not sure about the 767] have bulges on top of their fuselage. They are satelite comunications antennes [ie. for GPS nav; on-board telephones, irect TV-not on KL, etc].
There are different types:
The small vertical white-plates are for VHF radio-cummunications from and to the cockpit, and can be found both under the fuselage as on top of the fuselage:

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Photo © Martin Boschhuizen


This pic also clearly shows the large white bump on top of the fuselage at the Nr.4 door. I belive this one is to serve on-board telephones.

Just behing the bump of the upper deck there are two small antennea bumps, don't know what they serve, maybe HF communications:

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Photo © Peter Unmuth - Vienna Aviation Photography



Rule of thump: these bumps usually are antenneas. If they are on top of the fuselage, they serve satelites [or HF com, signals which bounce of between the earths atmoshere, and can bounce round the world]. If they are under the fuselage, they serve earth bound stations...

PW100



Immigration officer: "What's the purpose of your visit to the USA?" Spotter: "Shooting airliners with my Canon!"
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