Guest

What Is This?

Sun Mar 18, 2001 9:39 pm

guys,

take a look at the picture below and could anyone tell me what the wire like thing that goes from the middle of the 732 to the tail? What does it do? Do any other jets have this?


Click for large version
Click here for full size photo!

Photo © Mel Lawrence



thanks,

HL  Smile/happy/getting dizzy
 
Guest

RE: What Is This?

Sun Mar 18, 2001 10:04 pm

It is an ADF attena. They use it for naviagating.
Iain
 
Buff
Posts: 1066
Joined: Fri Mar 16, 2007 1:29 pm

RE: What Is This?

Mon Mar 19, 2001 12:02 am

It's an HF radio communications antenna, old style. Newer ones are more compact and don't require a 1/2 wavelength "cut".

Best Regards,

Buff
 
Guest

RE: What Is This?

Mon Mar 19, 2001 12:40 am

-1 for me then!
Iain
 
OPNLguy
Posts: 11191
Joined: Tue Jun 15, 1999 11:29 am

RE: What Is This?

Mon Mar 19, 2001 1:18 am

As Buff mentioned, HF... Not all that many 737s had these, mostly the ones that operated overseas, where the navaids (back in the 60s and 70s) were primitive in many areas of the world. (Yeah, like some things have changed.) This was all pre-GPS, and back when INS/Omega was pretty expensive, and not necessarily cost-effective for some narrow-bodied operators..

At Air Florida, a couple of our ex-Singapore 737-100s had them, and I think we later removed them. I have a vague recollection of one of the wires on one of our aircraft detaching from the tail, and subsequently beating the hell out of the fuselage, but I can recall any particulars...

http://www.airliners.net/open.file?id=19887&WxsIERv=Qm9laW5nIDczNy0xMTI%3D&WdsYXMg=QWlyIEZsb3JpZGE%3D&QtODMg=TWlhbWkgLSBJbnRlcm5hdGlvbmFsIChNSUEgLyBLTUlBKQ%3D%3D&ERDLTkt=VVNBIC0gRmxvcmlkYQ%3D%3D&ktODMp=U2VwdGVtYmVyIDE5ODA%3D&WNEb25u=QW5kcmV3IEFic2hpZXI%3D&xsIERvdWdsY=OVYtQkZG&MgTUQtODMgKE=RnVsbCBjb2xvcnMgYnV0IHdpdGggU2luZ2Fwb3JlIHJlZ2lzdHJhdGlvbiA5Vi1CRkYuIFdhcyBsYXRlciByZS1yZWdpc3RlcmVkIE40OEFGLiBUaGlzIGFpcmNyYWZ0IHdhcyB0aGUgbGFzdCBCNzM3LTEwMCBidWlsdCAoIzE5NzcyLzIxNywgZGVsLjEwLzY5IHRvIE1BUyBhcyA5TS1BT1cpLg%3D%3D&WxsIERvd=YWY3MzdzcXJlZy5qcGc%3D&YXMgTUQtODMgKERD=ODM4&NEb25uZWxs=MTk5OC0xMi0wNw%3D%3D&TWNEb25uZWxsIE=MTcyLjEzNy45MS4yNDU%3D&static=yes


http://www.airliners.net/open.file?id=59598&WxsIERv=Qm9laW5nIDczNy0yNDJD&WdsYXMg=Um95YWwgQWlybGluZXM%3D&QtODMg=Rm9ydCBMYXVkZXJkYWxlIC0gSG9sbHl3b29kIEludGVybmF0aW9uYWwgKEZMTCAvIEtGTEwp&ERDLTkt=VVNBIC0gRmxvcmlkYQ%3D%3D&ktODMp=T2N0b2JlciA5LCAxOTk5&WNEb25u=QnJ1Y2UgTGVpYm93aXR6&xsIERvdWdsY=Qy1GTkFQ&MgTUQtODMgKE=T3BlcmF0aW5nIGFzIFJveWFsIGZsaWdodCAzNzEgYW5kIHByb3VkbHkgZGlzcGxheWluZyBoZXIgQ2FuYWRpYW4gcmVnaXN0cnkgQy1GTkFQIChkZWxpdmVyZWQgNi8xNi83MSkuIElmIHlvdSBsb29rIGNsb3NlbHkgeW91IGNhbiBzZWUgdGhlIEhGIGFudGVubmEgcnVubmluZyBmcm9tIHRoZSB0b3Agb2YgdGhlIGZ1c2VsYWdlIHRvIHRoZSB0YWlsLg%3D%3D&WxsIERvd=MC1DLUZOQVAuanBn&YXMgTUQtODMgKERD=MTE0&NEb25uZWxs=MTk5OS0xMi0yNg%3D%3D&TWNEb25uZWxsIE=MjAwLjE5My4xMzguMTgy&static=yes

http://www.airliners.net/open.file?id=107972&WxsIERv=Qm9laW5nIDczNy0xNTk%3D&WdsYXMg=QXZpYW5jYQ%3D%3D&QtODMg=U2VhdHRsZSAtIEJvZWluZyBGaWVsZCAoQkZJKQ%3D%3D&ERDLTkt=VVNBIC0gV2FzaGluZ3Rvbg%3D%3D&ktODMp=Tm92ZW1iZXIgMTk2OA%3D%3D&WNEb25u=TWVsIExhd3JlbmNl&xsIERvdWdsY=SEstMTQwNFg%3D&MgTUQtODMgKE=KGNuIDE5NjgwLzk0LCBkZWwuMTEvNjgpIC0gc2hvcnRseSB0byBXZXN0R2VybUFGLEFsb2hhLEFpckNhbGlmLkdBVFg%3D&WxsIERvd=QXZpYW5jYTczNzE1OUhLMTQwNGJmaTExNjguanBn&YXMgTUQtODMgKERD=Mzkw&NEb25uZWxs=MjAwMC0wOS0wNg%3D%3D&TWNEb25uZWxsIE=MTUyLjE2My4yMDQuNjk%3D&static=yes

http://www.airliners.net/open.file?id=90697&WxsIERv=Qm9laW5nIDczNy0xMTI%3D&WdsYXMg=TVNBIE1hbGF5c2lhLVNpbmdhcG9yZSBBaXJsaW5lcw%3D%3D&QtODMg=U2VhdHRsZSAtIEJvZWluZyBGaWVsZCAoQkZJKQ%3D%3D&ERDLTkt=VVNBIC0gV2FzaGluZ3Rvbg%3D%3D&ktODMp=TWF5IDE5NzE%3D&WNEb25u=TWVsIExhd3JlbmNl&xsIERvdWdsY=OU0tQU9V&MgTUQtODMgKE=OU0tQU9VICgjMTk3NjgvMTg0LCBkZWwuMDcvNjkpLg%3D%3D&WxsIERvd=TVNBNzM3MjlNQURVYmZpNTcxLmpwZw%3D%3D&YXMgTUQtODMgKERD=MzA1&NEb25uZWxs=MjAwMC0wNi0yMw%3D%3D&TWNEb25uZWxsIE=MjA4LjguNTcuMg%3D%3D&static=yes
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
sushka
Posts: 4657
Joined: Thu Nov 18, 1999 12:33 am

RE: What Is This?

Mon Mar 19, 2001 1:53 am

Some early 737-300s had them also.
Pershoyu Spravoyu Litaki!
 
Guest

RE: What Is This?

Mon Mar 19, 2001 2:14 am

Would they use the HF radio for navigating or communications? Don't they still use HF radio for transmitting coordinates ETA's etc. on trans-atlantic flights?
 
atct
Posts: 2472
Joined: Fri Mar 16, 2001 6:42 am

Atennae

Mon Mar 19, 2001 4:00 am

That is an Antanea (spelling? hehe0

ATCT
Trikes are for kids!
 
Buff
Posts: 1066
Joined: Fri Mar 16, 2007 1:29 pm

RE: What Is This?

Mon Mar 19, 2001 8:45 am

The HF is used for voice communications and SELCAL. I'm not sure if data link capabilities are there, but possibly.

Best Regards,

Buff
 
Twotterwrench
Posts: 1087
Joined: Tue Jan 16, 2001 5:57 pm

RE: What Is This?

Mon Mar 19, 2001 9:59 am

i am no twidget, but I thought 1 wire = hf antenna but 2 wires= adf sense. I believe the antenna shown in the picture he asks about are sense wires for #1 and #2 adf's.
 
Guest

RE: What Is This?

Mon Mar 19, 2001 10:13 am

So does this mean I was not wrong?  Smile/happy/getting dizzy
Iain
 
Buff
Posts: 1066
Joined: Fri Mar 16, 2007 1:29 pm

RE: What Is This?

Tue Mar 20, 2001 11:09 am

Pretty sure it's an HF antenna, modified dipole? We have any avionics types here?

Keep in mind the oldest 737 is newer than the newest tube-driven ADF!

Best Regards,

Buff
 
desertjets
Posts: 7588
Joined: Fri Feb 18, 2000 3:12 pm

RE: What Is This?

Tue Mar 20, 2001 11:20 am

While we are on the subject of asking what things are... can anyone explain to me the function of the sucker doors on the engines. I have seen them on early 737-100s and -200s as well as early 747s with the JT9Ds... though they didn't seem to have them for long.
Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia

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