Why Four Rotating Beacons On The L1011? — Tech Ops Forum

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Why Four Rotating Beacons On The L1011?

JumboJim747 From Australia, joined Oct 2004, 2383 posts, RR: 55
Posted (4 years 6 months 1 week 1 day 10 hours ago) and read 965 times:

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I just found out from a magazine article that the L1011 had four rotating beacons opposed to the usual 2 that aircraft have?
Sorry if this has come up before.
The article failed to mention why the extra beacon on top and an extra beacon on the bottom was used .
Any help would be appreciated

[Edited 2005-05-04 22:59:46]

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8 replies: All unread, jump to last

CitationJet From United States, joined Mar 2003, 1564 posts, RR: 4
Reply 1, posted (4 years 6 months 1 week 1 day 9 hours ago) and read 954 times:

See Reply #2 in the following thread:
http://www.airliners.net/discussions/general_aviation/read.main/28571/

I did a search using "1011 beacon" to find it. Wink

Boeing Flown: 701,702,703; 717; 720; 721,722; 731,732,733,734,735,737,738,739; 741,742,743,744,747SP; 752; 762,763; 772.

JumboJim747 From Australia, joined Oct 2004, 2383 posts, RR: 55
Reply 2, posted (4 years 6 months 1 week 1 day 9 hours ago) and read 926 times:

Quoting CitationJet (Reply 1):
See Reply #2 in the following thread:

Thanks for the reply i clicked on the lengthy thread but still does not say why they opted for the extra 2 beacons or could it be that they wanted to be different.?

Family is the most important thing in the world

EMBQA From United States, joined Oct 2003, 8358 posts, RR: 18
Reply 3, posted (4 years 6 months 1 week 1 day 8 hours ago) and read 898 times:

They went with 2 for redundancy. It one failed, they would still have one for dispatch.

"It's not the size of the dog in the fight, but the size of the fight in the dog"

CitationJet From United States, joined Mar 2003, 1564 posts, RR: 4
Reply 4, posted (4 years 6 months 1 week 1 day 7 hours ago) and read 881 times:

Quoting JumboJim747 (Reply 2):
i clicked on the lengthy thread but still does not say why they opted for the extra 2 beacons or could it be that they wanted to be different

Reply #2 stated that the extra beacons were not required, but for redundancy, just like EMBQA also stated.

And let us not forget the dual navigation beacon on the top of the fuselage. Aircraft are required to only have one. Lockheed being lockheed at the time, put a second one for redundancy.

[Edited 2005-05-05 01:53:57]

Boeing Flown: 701,702,703; 717; 720; 721,722; 731,732,733,734,735,737,738,739; 741,742,743,744,747SP; 752; 762,763; 772.

JumboJim747 From Australia, joined Oct 2004, 2383 posts, RR: 55
Reply 5, posted (4 years 6 months 1 week 1 day 6 hours ago) and read 865 times:

Thank you all for the information
redundancy.
To get any manufacturer to put anything extra for that reason these days is very hard .
Goes without saying they dont make planes like they used too

Family is the most important thing in the world

Mir From United States, joined Jan 2004, 12968 posts, RR: 65
Reply 6, posted (4 years 6 months 1 week 1 day ago) and read 799 times:

Why don't they put an extra on these days? They can't be that expensive for the manufacturer to install, and the redundancy could allow a plane to depart when one of its beacons failed.

-Mir

NaNoWriMo 2008 -- 51,156! Win!

HAWK21M From India, joined Jan 2001, 27727 posts, RR: 60
Reply 7, posted (4 years 6 months 1 week 17 hours ago) and read 745 times:

Any other Aircraft with Four.
regds
MEL

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Air2gxs From , joined Dec 1969, posts, RR:
Reply 8, posted (4 years 6 months 1 week 12 hours ago) and read 715 times:

Quoting Mir (Reply 6):
Why don't they put an extra on these days? They can't be that expensive for the manufacturer to install, and the redundancy could allow a plane to depart when one of its beacons failed.

If I recall the various MELs correctly, the high intensity strobes on the wing tips are added into the MEL equation. Most newer aircraft now have high intensity strobes (white) installed on the wing tip. The MEL counts these strobes as anti-collision lights. So, in effect, there are 4 installed, just not where you'd think. 4 installed, 3 required for dispatch into night or IFR.