smartt1982 From United Kingdom, joined Nov 2007, 212 posts, RR: 0 Posted (1 year 2 weeks 5 days 19 hours ago) and read 3401 times:
HI,
Was sitting in the cockpit jump seat of 737 NG the other day and noticed on the right side bulkhead (where 1st observer O2 and Data loading connection are located) there appears to be a large amount of rivets in the bulkhead, looks like the hull of a ship. This seems to be in contrast to the left side where there does not to be as many?
amccann From United States of America, joined Mar 2008, 171 posts, RR: 0 Reply 1, posted (1 year 2 weeks 5 days 19 hours ago) and read 3388 times:
Did you happen to see the outside of the airplane? Or possibly the tail number? If you caught either of those you could look at pictures and determine if there is an external doubler on the RHS. However without tail number, I would still imagine if there is a large amount of rivets on the RHS and not the LHS, in presumably an area that sees equal loads on the RHS and LHS there is probably an external doubler on the RHS.
What one person receives without working for, another person must work for without receiving. - Ronald Reagan
MD11Engineer From Germany, joined Oct 2003, 13334 posts, RR: 64 Reply 2, posted (1 year 2 weeks 5 days 13 hours ago) and read 3239 times:
Quoting amccann (Reply 1): Did you happen to see the outside of the airplane? Or possibly the tail number? If you caught either of those you could look at pictures and determine if there is an external doubler on the RHS. However without tail number, I would still imagine if there is a large amount of rivets on the RHS and not the LHS, in presumably an area that sees equal loads on the RHS and LHS there is probably an external doubler on the RHS.
The location specified (Obs O2 mask, data loading receptacle) would be the inboard side of the P6 panel, well inside the aircraft.
smartt1982 From United Kingdom, joined Nov 2007, 212 posts, RR: 0 Reply 3, posted (1 year 2 weeks 5 days 10 hours ago) and read 3163 times:
Hiya,
Apologies meant to clarify, this is inside the cockpit, on the righthand side internal bulkhead after you have just entered the cockpit. I cannot seem to find the photo I took, I will take another one today and add it.
yeelep From United States of America, joined Apr 2011, 526 posts, RR: 0 Reply 5, posted (1 year 2 weeks 18 hours ago) and read 2103 times:
I can only guess that the left side has countersunk rivets on the inboard face due to the location of the 2nd observers seat. The rivet spacing seems the be similar on each side, there is just more structure on the right side so more rivets.
CCA From Hong Kong, joined Oct 2002, 707 posts, RR: 14 Reply 6, posted (1 year 2 weeks 3 hours ago) and read 1889 times:
Been many many years since I've touched a rivet gun however 5D ( 5 x diameter) came to mind as a fairly standard spacing of rivets, 4-8D is mentioned below from a quick online search.
Quote: Rivet spacing, also referred as rivet pitch, is the distance between the rivets in the same row, and is measured from the rivet center to the rivet center.Transverse pitch is the distance between the rows of rivets, and is measured from the rivet center to rivet center. Edge distance is the distance from the center of the rivet to the edge of the material being riveted. There are no specific rules that apply to every case or type of riveting. There are, however, certain general rules that should be followed.
RIVET SPACING.— Rivet spacing (pitch) depends upon several factors, principally the thickness of the sheet, the diameter of the rivets, and the manner in which the sheet will be stressed. Rivet spacing should never be less than three times the rivet diameter. Spacing is seldom less than four times the diameter nor more than eight times the diameter.
Sponsor Message: 
From United Kingdom, joined Nov 2007, 212 posts, 
From United States of America, joined Mar 2008, 171 posts, 
From Germany, joined Oct 2003, 13334 posts, 
From India, joined Jan 2001, 31201 posts, 
From Hong Kong, joined Oct 2002, 707 posts, 
Sponsor Message: 
Printer friendly format
