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SXDFC
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737NG Smaller Fwd Bin?

Fri Apr 17, 2015 4:09 am

Hello All:

Tonight I was working two 737-800s, one of them was a 2014 build, the other a 2015 build (2nd newest -800 in the WN fleet). I noticed in the slightly older -800 that the fwd bin, WN calls it "Bin A" is larger than the newer -800s. Can anyone explain why this is the case?

"Bin A' on N8628A (2014 737-800/ Larger Bin)

http://i1208.photobucket.com/albums/cc368/737-8H4/new/01261D20-68C5-433B-AB35-ECC1CC867EE6_zpssmgkhjjg.jpg

"Bin A" on N8663A (2015 737-800/ Smaller Bin)

http://i1208.photobucket.com/albums/cc368/737-8H4/new/5C50C969-4411-417C-82BC-CEC8AE59A050_zpstkssir4p.jpg

I noticed on A/C 8628 the sticker that says "BHD 396" and "BHD 402" on A/C 8663. So can anyone explain to me why this is the case?
 
dynamicsguy
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RE: 737NG Smaller Fwd Bin?

Fri Apr 17, 2015 9:40 am

Boeing recently redesigned the area to give more space to the electrical bay on the other side of that bulkhead to make it easier the run all of the cables back there. The distance they moved it was small - somewhere around 6 or 8 inches. Maybe the number refers to the station, which would make sense if the difference is 6 inches.

This same question came up not long ago, but I don't think there was much more in that thread. Most of it was taken up by people thinking that the OP had asked about the overhead bins.
 
yeelep
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RE: 737NG Smaller Fwd Bin?

Fri Apr 17, 2015 2:11 pm

Yep, the numbers are Bulkhead station 396 and 402.
 
Tristarsteve
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RE: 737NG Smaller Fwd Bin?

Fri Apr 17, 2015 2:46 pm

Quoting yeelep (Reply 2):
Yep, the numbers are Bulkhead station 396 and 402.

And for those that don't understand the number 396 is a measurement in inches from a point in front of the nose of the aircraft. So 402 is 6 inches further aft than 396. All points in the fuselage are pinpointed using station numbers, and Boeing is very helpful in painting them on the frames and bulkheads.
 
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HAWK21M
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RE: 737NG Smaller Fwd Bin?

Sat Apr 18, 2015 9:47 am

Quoting dynamicsguy (Reply 1):
people thinking that the OP had asked about the overhead bins.

Probably the Title did not mention Bulk compartment.

Quoting yeelep (Reply 2):

Yep, the numbers are Bulkhead station 396 and 402.

BHD....Bulkhead....... whats D.
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Dalmd88
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RE: 737NG Smaller Fwd Bin?

Sat Apr 18, 2015 1:59 pm

Quoting HAWK21M (Reply 4):
BHD....Bulkhead....... whats D.

That is just Boeing's way of writing it, BulkHeaD I suppose.
 
alasizon
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RE: 737NG Smaller Fwd Bin?

Sat Apr 18, 2015 6:23 pm

I believe BHD stands for Bulkhead Distance where that distance is measured from a certain datum in the front of the AC.
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CALTECH
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RE: 737NG Smaller Fwd Bin?

Sat Apr 18, 2015 6:51 pm

Quoting yeelep (Reply 2):
Yep, the numbers are Bulkhead station 396 and 402.
Quoting Tristarsteve (Reply 3):
And for those that don't understand the number 396 is a measurement in inches from a point in front of the nose of the aircraft. So 402 is 6 inches further aft than 396. All points in the fuselage are pinpointed using station numbers, and Boeing is very helpful in painting them on the frames and bulkheads.

Easy to find Stations as every frame is marked STA XXX, where Xs are inches from reference point.

The front of the radome is Station 130. The reference point is 130 inches (3.302 meters) ahead of the radome.
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HAWK21M
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RE: 737NG Smaller Fwd Bin?

Sun Apr 19, 2015 10:26 am

I suppose Bulkhead distance sounds better for BHD....makes sense.
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Polot
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RE: 737NG Smaller Fwd Bin?

Sun Apr 19, 2015 1:32 pm

Quoting CALTECH (Reply 7):
The front of the radome is Station 130. The reference point is 130 inches (3.302 meters) ahead of the radome.

Does anyone happen to know why Boeing chose a point 130 inches in front of the plane versus setting the nose of the radome to be 0?
 
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bikerthai
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RE: 737NG Smaller Fwd Bin?

Mon Apr 20, 2015 3:49 pm

Quoting Polot (Reply 9):
Does anyone happen to know why Boeing chose a point 130 inches in front of the plane versus setting the nose of the radome to be 0

It's a pain to deal with negative number in drafting (the negative numbers will be confused with part dash number). The reference number was chosen so that protrusions (fuel probes, antenna, etc.) can stay in the positive number.

bt

[Edited 2015-04-20 08:52:10]
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CALTECH
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RE: 737NG Smaller Fwd Bin?

Mon Apr 20, 2015 8:45 pm

Quoting Polot (Reply 9):
Does anyone happen to know why Boeing chose a point 130 inches in front of the plane versus setting the nose of the radome to be 0?
Quoting bikerthai (Reply 10):
It's a pain to deal with negative number in drafting (the negative numbers will be confused with part dash number). The reference number was chosen so that protrusions (fuel probes, antenna, etc.) can stay in the positive number.

Made for easier Moment Calculations with all numbers being positive. Only rule for a datum point was that it had to remain the same through the life of the aircraft. Believe the 707, 727, and 737 all had the same Refernce Point, 130 inches in front of the nose.

And as for the why Boeing chose the point, IIRC as told to us by a Boeing engineer, it was because of this and they just kept it the same for the early Boeing narrow bodies.

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bikerthai
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RE: 737NG Smaller Fwd Bin?

Tue Apr 21, 2015 1:24 pm

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CALTECH
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RE: 737NG Smaller Fwd Bin?

Wed Apr 22, 2015 3:51 am

720 was much later. Some of those early Boeing narrow bodies had really wild radomes,...

http://upload.wikimedia.org/wikipedia/commons/4/48/RC-135_Cobra_Ball_aircraft_parked_at_Offutt.jpg

http://cdn1.airplane-pictures.net/images/uploaded-images/2008/12/19/31600.jpg
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