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Why 'eyebrows' On Aircraft?  
User currently offlineJetplaner From Canada, joined Mar 2008, 158 posts, RR: 0
Posted (5 years 6 months 1 week 6 days 3 hours ago) and read 5320 times:

Just a question that was bugging me, why do some aircraft have eyebrows. I know that they were common on older aircraft, but they aren't on any new aircraft. That must mean they aren't necessary, so why were they on older aircraft? Would it be for navigation? I know that some 717 have them and some not, and that on later aircraft they were removed to save weight. So why were eyebrows so popular on older aircraft?


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7 replies: All unread, jump to last
 
User currently offlineDoug_or From United States of America, joined Mar 2000, 3424 posts, RR: 3
Reply 1, posted (5 years 6 months 1 week 6 days 2 hours ago) and read 5313 times:

It prevents dust from getting in their eyes and helps them express emotions


When in doubt, one B pump off
User currently offlineThirtyEcho From United States of America, joined Dec 2001, 1654 posts, RR: 1
Reply 2, posted (5 years 6 months 1 week 6 days 1 hour ago) and read 5279 times:

The 737 eyebrow windows are there so that WN pilots can see the end of the runway on a base-to-final turn.

User currently offlineKELPkid From United States of America, joined Nov 2005, 6411 posts, RR: 3
Reply 3, posted (5 years 6 months 1 week 6 days ago) and read 5266 times:

IIRC, the CAR's of old (predecessor to the FAR's) required a certain field of view for the captain and first officer, including the ability to be able to get a good visual scan upwards...

However, you will notice that, in reality, flight crews tend to stick whatever they can into the eyebrow windows to prevent excessive amounts of sunlight from permeating the cockpit  Wink



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineGST From United Kingdom, joined Jun 2008, 934 posts, RR: 0
Reply 4, posted (5 years 6 months 1 week 5 days 22 hours ago) and read 5234 times:



Quoting KELPkid (Reply 3):
IIRC, the CAR's of old (predecessor to the FAR's) required a certain field of view for the captain and first officer, including the ability to be able to get a good visual scan upwards...

It is still considered "ideal" for an aircraft to offer 40 degrees of vision above the horizon when the captain is looking between 85 and 95 degrees left, or the first officer the same right. In some cases eyebrow windows were considered the optimum way of offering that field of view, given that a few larger window assemblies can be heavier than several small window assembloes as flight deck windows must resist birdstrike.


User currently offlineSoon7x7 From , joined Dec 1969, posts, RR:
Reply 5, posted (5 years 6 months 1 week 5 days 9 hours ago) and read 5044 times:

It's designed to be same scale as a canadian goose, when the windows go dark in flight...expect double flame outs...  Wow!

User currently offlinePGNCS From United States of America, joined Apr 2007, 2834 posts, RR: 45
Reply 6, posted (5 years 6 months 1 week 5 days 8 hours ago) and read 5006 times:

Perhaps one of the certification gurus can comment, but my understanding is that they were put there to meet cross-cockpit visibility requirements at the MDA on a circling approach. They have (obviously) been found to not be needed, so they can be removed on some types now.

I detest them; they do effectively nothing for visibility, but make for much hotter cockpits, and are difficult to shade when the sun is peering through them at just the wrong angle...which leads to a lot of improvised shades normally made from some type of paper easily found in the cockpit.


User currently offlineVikkyvik From United States of America, joined Jul 2003, 10109 posts, RR: 26
Reply 7, posted (5 years 6 months 1 week 5 days 3 hours ago) and read 4955 times:
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If you scroll down to page 15 of the following document (page 19 of the PDF), there's a diagram of the Mil Spec for bomber/transport aircraft cockpit visibility (for 2-person cockpits).

I don't know if this is what the FAA uses as well, but it's what I'm (somewhat) familiar with.

www.everyspec.com/MIL-STD/MIL-STD+(0...load.php?spec=MIL_STD_850B.948.pdf



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