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747SP Cabin Window Question  
User currently offlineReggaebird From Jamaica, joined Nov 1999, 1176 posts, RR: 0
Posted (3 years 3 days 15 hours ago) and read 4092 times:

Check out the view at 1:01 in the following video of a Boeing 747SP. Does anyone know why there are rectangular protrusions around the windows?

http://www.youtube.com/watch?v=jnl0M0AthNA&feature=channel_video_title

10 replies: All unread, jump to last
 
User currently offlineKDTWflyer From United States of America, joined Jun 2004, 830 posts, RR: 1
Reply 1, posted (3 years 3 days 13 hours ago) and read 3951 times:

http://www.airliners.net/photo/Saudi...d=13831658d766c875580573f52b3d719e

strange



NW B744 B742 B753 B752 A333 A332 A320 A319 DC10 DC9 ARJ CRJ S340
User currently offlineKDTWflyer From United States of America, joined Jun 2004, 830 posts, RR: 1
Reply 2, posted (3 years 3 days 13 hours ago) and read 3946 times:

http://www.airliners.net/photo/Syria...d=0b9f42faa05d27a8463ed893bea8fe31 Seems to be a Saudi thing only


NW B744 B742 B753 B752 A333 A332 A320 A319 DC10 DC9 ARJ CRJ S340
User currently offlineLTC8K6 From United States of America, joined Jun 2009, 1210 posts, RR: 0
Reply 3, posted (3 years 3 days 13 hours ago) and read 3940 times:

Looks like a lot of structural patching...

User currently offlineViscount724 From Switzerland, joined Oct 2006, 25370 posts, RR: 22
Reply 4, posted (3 years 3 days 10 hours ago) and read 3864 times:

Quoting LTC8K6 (Reply 3):
Looks like a lot of structural patching...

It's common on many older aircraft to overcome "aging" issues related to fatigue, cracking etc. Enlarge the photo below and note all the "doubler" patches on the 25-year-old WN 733 below, including a large one above the windows starting just behind the first window, many smaller ones below the windows and in other places, including a large one around the upper left hand corner of the door.


View Large View Medium
Click here for bigger photo!

Photo © Suresh A. Atapattu



User currently offlineKELPkid From United States of America, joined Nov 2005, 6392 posts, RR: 3
Reply 5, posted (3 years 3 days 10 hours ago) and read 3861 times:

Quoting Viscount724 (Reply 4):
It's common on many older aircraft to overcome "aging" issues related to fatigue, cracking etc. Enlarge the photo below and note all the "doubler" patches on the 25-year-old WN 733 below, including a large one above the windows starting just behind the first window, many smaller ones below the windows and in other places, including a large one around the upper left hand corner of the door.

The canyon blue paint has a way of making that so much more obvious...You used to have to be looking for the doublers when the paint was still brownish tan  



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 6, posted (3 years 2 days 21 hours ago) and read 3658 times:

Seems to be doublers post structural repair ......maybe recommended by the Manufacturer or a repair carried out.Maybe someone having worked on the type would know in more detail.


Think of the brighter side!
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 7, posted (3 years 2 days 4 hours ago) and read 3456 times:

The WN photo shows how the "lap joints" were reinforced (long rectangle doublers above and below the windows). The installation of these reinforcement doublers was the result of the Aging Aircraft Task Force recommendations after the Aloha incident. All 737's that have reached a specified number of flight cycles require these doublers.

However, there are also numerous repairs scattered about (the smaller square and rectangle doublers). These patches would have been installed to repair ramp damage, in service cracking and or corrosion.


User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 8, posted (3 years 20 hours ago) and read 3186 times:

These Patches in the Frontal areas of the fuselage would contribute to significant payload restrictions due performance penalties.


Think of the brighter side!
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 79
Reply 9, posted (3 years 18 hours ago) and read 3160 times:

Quoting HAWK21M (Reply 8):

These Patches in the Frontal areas of the fuselage would contribute to significant payload restrictions due performance penalties.

Is that a documented thing? Beyond the weight, those patches are so thin that I doubt they're even penetrating the boundary layer once you get a few frames back.

Tom.


User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 10, posted (2 years 12 months 3 days 20 hours ago) and read 2872 times:

Quoting tdscanuck (Reply 9):

Is that a documented thing? Beyond the weight, those patches are so thin that I doubt they're even penetrating the boundary layer once you get a few frames back.

I'm sure these patches on Section 41 frontal area would contribute significantly to drag & loss of aerodynamic efficiency & subsequent ROC.



Think of the brighter side!
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