Fly2HMO From , joined Dec 1969, posts, RR:
Reply 4, posted (4 years 1 month 4 weeks ago) and read 5046 times:
Quoting BladeLWS (Reply 1): I'm gonna say its an outflow valve for the cabin pressure.
Me thinks so too.
Quoting c5load (Reply 2): What about an air conditioning intake vent?
Nope. Intakes are purposely made to be able to, well, intake as much air as efficiently as possible. A random flat hole on the side of the fuselage will not have air flowing into it, and therefore would not work as an intake. Intakes usually look like a teardrop with a flat bottom or like a wedge of sorts, like on the nose of this plane.
KELPkid From United States of America, joined Nov 2005, 6346 posts, RR: 3
Reply 7, posted (4 years 1 month 3 weeks 6 days 2 hours ago) and read 4589 times:
Quoting tdscanuck (Reply 5): Definitely an outflow valve...the visible flapper is a dead giveaway.
Quoting CosmicCruiser (Reply 6): tdscanuck is right. Yes, it's the outflow valve. Same on the MD-11 as well. You can see the pack inlet doors on the lower nose with the third not visible on the other side.
Is it just me, or am I mistaken in the (now disproved) belief that the cabin outflow valve is usually located at the rear of the pressure dome in the fuselage?
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
boeing767mech From United States of America, joined Dec 2000, 1025 posts, RR: 3
Reply 10, posted (4 years 1 month 3 weeks 6 days 1 hour ago) and read 4546 times:
Quoting KELPkid (Reply 7): Is it just me, or am I mistaken in the (now disproved) belief that the cabin outflow valve is usually located at the rear of the pressure dome in the fuselage?
Quoting Fly2HMO (Reply 8): That's how it is usually. However, I don't know of any reason why it HAS to be back there. Maybe somebody can enlighten us.
The A330 and A340 has the outflow valves in the belly behind the wing to body fairings.
The 777 has two outflow valves one near the aft pressure bulkhead, and the other in the belly just behind nose landing gear.
The JS3101 and 3201 have the outflow valve on the fwd pressure bulkhead near the co-pilots feet.
I was told by an instructor in a gen fam class on the 767 that they put the outflow valve near the pressure bulkhead to help aid the flow of air in the cabin. Since most of the air comes from overhead ducts and the outflow valves are located below the cabin floor area. But then that was what he explained. All I know is if it is broken I fix it, where ever it is located.