Seeing this picture I wondered why this DC-9-15 has two emergency "over the wing exits" on each side. (I suppose the opposite side has also two).
I know that the six DC-9-15 operated by KLM had only one over the wing exit on each side as seen on this pic.
Does it has to do with the fact that the CO aircraft is a RC variant? Or does it has something to do as we see nowadays with the Airbus A319 which at some carriers has a HD configuration and therfore needs extra over the wing exits as well?
As seen in these two pictures
DL_Mech From United States of America, joined Feb 2000, 1769 posts, RR: 10 Reply 1, posted (1 year 5 months 2 weeks 4 days 4 hours ago) and read 2118 times:
Quoting kl5147 (Thread starter): Does it has to do with the fact that the CO aircraft is a RC variant?
JRadier From Netherlands, joined Sep 2004, 4599 posts, RR: 51 Reply 2, posted (1 year 5 months 2 weeks 4 days 3 hours ago) and read 2104 times:
Just guessing here, but according to wiki (I know..) the aft-airstair was just an option on the 9-10, while it doesn't specify for others. Perhaps the two overwing exits can be explained by the lack of an airstair, requiring other emergency exits (e.g. over the wing)?
For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and ther
JRadier From Netherlands, joined Sep 2004, 4599 posts, RR: 51 Reply 5, posted (1 year 5 months 2 weeks 4 days ago) and read 2052 times:
Ok, I'll shoot down my own hypothesis, I don't think airstairs are an issue. According to NW DC9 Aft Stairways? (by KaiGywer Mar 7 2004 in Civil Aviation) reply 6 DC-9-11 had no airstairs, while for the -15 it was an option. So this does not explain the difference.
The fact that it is an RC version seems to do, as all -15RCs in the database have double overwing exits, while the normal ones have a single one. I doubt that it was certified to hold more people, so that doesn't explain it. I'm going to throw in a hypothesis which I think isn't the real truth, but who knows. As the 15RC has the seats on pallets, perhaps the seat layout on the various pallets was different, possibly blocking an exit so they put in two, with one always being available? Sounds unlikely to me, but who knows!?
For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and ther
PapaChuck From United States of America, joined Aug 2010, 135 posts, RR: 0 Reply 6, posted (1 year 5 months 2 weeks 3 days 16 hours ago) and read 1896 times:
A quick look at the DC-9 type certificate might help. On -10 models with only one over-wing exit per side, maximum passenger capacity is 94. With two per side, that number goes up to 109.
Same with the A319. With one over-wing exit, 145 seats max. With two, 160 seats max. It's a customer option based on how many seats they plan to cram in there. If you're not planning on ever having more than 145 seats in an A319, don't bother with the additional exit. It just just adds weight and maintenance costs.
Viscount724 From Switzerland, joined Oct 2006, 21679 posts, RR: 23 Reply 7, posted (1 year 5 months 2 weeks 3 days 14 hours ago) and read 1834 times:
Another issue with the DC-9-15RC is that if operated in a colmbi-configuration with a couple of cargo pallets at the front, you lose the use of the forward passenger and galley service doors. I would guess that in that event just one overwing exit may not meet certification requirements for evacuation.
On the 737-200 combi, which of course has a full size rear passenger door and galley service door, I believe the single overwing exit on each side has to be within the passenger cabin once combi seating exceeds some number like 35 or so. If passenger seating is less than that the rear doors are enough and the overwing exits can be within the cargo compartment.
Unlike the 737-200C,I don't think many (if any) of the DC-9-15RCs operated in combi configuration. I think they were generally all-cargo or all-passenger. Only 24 were built, 19 for CO and 5 for Texas International Airlines (which was still Trans-Texas Airways when they were delivered.)
HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58 Reply 8, posted (1 year 5 months 2 weeks 3 days 10 hours ago) and read 1779 times:
Exits should be required by regulatory depending on the Pax carrying capacity of the Aircraft in question,to enable evacuation within x minutes & considering 50% doors jammed shut.
Is there any literature on this type regarding the variants especially of exit doors.
Sponsor Message: 
From Netherlands, joined Aug 2005, 303 posts, 
From United States of America, joined Feb 2000, 1769 posts, 
From Slovakia, joined Aug 2005, 1111 posts, 
From Switzerland, joined Oct 2006, 21679 posts, 
From India, joined Jan 2001, 31228 posts, 
From Australia, joined Feb 2008, 683 posts, 
Sponsor Message: 
Printer friendly format
