Eric From , joined Dec 1969, posts, RR:
Reply 1, posted (15 years 7 months 1 week 3 days ago) and read 886 times:
The oxygen masks in the FC cabin on DC-10s fall out of the seat back in front of them just like in the main cabin. There is one extra O2 mask per seat grouping, ie. if the configuration is 2-2-2 then each than each pair of seats will have a total of three masks. This serves three functions: 1) so that anyone carrying an infant in their lap will have a mask for the infant if need be; 2) provides for an extra mask in case one is non-operational; 3) serves as a back-up mask for flight attendants who may be in the aisle (although they have masks located at their jumpseats, their immediate action procedures in the event of decompression are to sweep the nearest mask to their face, sit down and hold on).
CV880 From United States of America, joined Mar 2007, 1152 posts, RR: 2
Reply 3, posted (15 years 7 months 1 week 2 days 2 hours ago) and read 886 times:
The original (non-Super) DC-8 had seatback oxygen as well, so it must be a Douglas characteristic. Note that the stretch -8 and the DC-9 (all models) had overhead oxygen panels.
In the case of the DC-10, the seatback mounting eliminated the need to have tubing which extends all the way from the ceiling to the seat. Remember, when the DC-10 was introduced, it did not feature overhead bins over the center cluster of seats.
The trend towards the very slim (read: hard cushions) coach seats at 31-32" pitch has made seatback compartments difficult or impossible.
The 777, A340 and 747 have overhead compartments housing the masks. So did the L1011.
Cubanaair From , joined Dec 1969, posts, RR:
Reply 4, posted (15 years 7 months 1 week 10 hours ago) and read 887 times:
The DC10 has oxygen compartments on seatbacks but also some on overhead and cabin divider bulk-heads.The system for supplying O2 to the cabin works with oxygen generators(one in each compartment) that are activated when you pull the mask toward you(a lanyard pulls a pin on the generator)You may remember hearing these O2 generators named as the reason the Value Jet a/c crashed in the Everglades,the O2 is produced by a chemical reaction wich heats up the outside of the unit to blistering temperatures so there is a "heat shield" covering the generator to keep passengers from burning themselves during use. The reason for the radically different system (at the time other a/c had a central storage tank for supplemental oxygen wich conected to each mask by meters of tubing)was lower maintenance costs as well as improved reliability, a less cumbersome system is easier to test. Obviously,it's worked well , because every other a/c model since then(those I'm qualified to fly that is)has the same basic O2 system on it,on newer a/c generators are in ceiling compartments,but basically it's just like on the "10". With the storage tank ,the pilot controls not only when the compartments opens , but also the oxygen flow. On the generators, they can only open the compartments from the cockpit, the O2 starts only when passengers fire the individual units and can't be stopped .O2 will flow for approximately 15 minutes. The a/c I'm checked-out on are:727,767,MD80,DC10,MD11 and A300.Of these, only the 727 has the "tank" system. Fernando :-)