From: email@example.com (Glenn Bridgland) Organization: CompuServe Incorporated Date: 11 Oct 96 19:44:49 References: 1
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Jean-Francois Mezei <firstname.lastname@example.org> wrote: >On a recent DC-9 flight on Air Canada (LGA-YUL), I noticed the year >"1967" on a plaque on the left side of the entry door frame. (My first >flight in a DC-9 in years) >I would be interested in knowing when the DC-9s were first introduced, >and when they were at their apex of sales, and when did sales of new >DC-9s stop ? Was the DC-9 immediatly replaced by the MD80 or was there a >few years in between ? >Are there still a lot or DC9s that were built prior to 1970 in service >in North America, or was the one I flew a true/rare "vintage" one ? I can't tell you the dates of production, but as recently as 1989 I was flying DC9-30 series of this vintage. Well-maintained, they were still in good shape. There are a lot of them still around. >Also, I noticed a hole in the leading edge of the tail, just above the >fuselage. Is this an air intake for the apu ? It's the intake for the cooling air going to the airconditioning heat exchangers. The APU air intake is a set of doors under the aft fuselage. >Also, the rubber gasket on the front door seemed quite different from >other more modern planes. Is this the actual air tight barrier when door >is closed, of does this very visible rubber gasket serve a protective or >other function ? Being of the "plug" type, the door itself does most of the sealing by fitting the frame very tightly, with only a small additional rubber seal needed. The larger rubber gasket you saw is mainly protective, as you suggested. >Finally, through an opening between the wall and overhead bins, I >noticed a copper pipe (looked like copper) running along the wall with >some hookups for every row. The pipe was about 1cm in diameter. Had it >not been for the Valuejet crash where those oxygen generators were >described, I would have thought that this pipe would have been the >oxygen supply. I seems too small for the air supply for the over head >air nozzles. What would this pipe be used for ? Is it possible that on >some models of DC9s, the oxygen was centrally supplied through such a >pipe as opposed to having individual generators over every row ? You may indeed have been looking at the oxygen supply line, as the passenger oxygen is stored in a cylinder on the flight deck; at least it was on ours. Chemical generators were introduced (I think) with the MD80.