Aer Lingus From Ireland, joined May 2000, 1508 posts, RR: 0 Posted (12 years 1 week 1 day 2 hours ago) and read 6004 times:
I was watching a DC-10 on rotation a EIDW (Dublin) the other night and noticed three small doors open in front of the #1 engine on the fuselage. They seemed like the doors which house the cargo door open handels, but I didn't see any cargo door ! One was about 2 ft long and was skinny, the other was similar to a fuel cap on a car.
Can someone please enlighten me 'cos I don't think that's normal !
OPNLguy From , joined Dec 1969, posts, RR: Reply 1, posted (12 years 1 week 21 hours ago) and read 5849 times:
It's been quite awhile since I was around DC10s, but I'm pretty certain what you saw was two different things, one being one of the outflow valves, and the other being a static port.
VC-10 From United Kingdom, joined Oct 1999, 3656 posts, RR: 42 Reply 2, posted (12 years 1 week 18 hours ago) and read 5800 times:
It is the outflow valve. It comprises of three units. Working Fwd to Aft :-
1. An Air deflector
2. A large valve that is open on the ground to prevent to a/c pressurising on the ground with the Air Cond Packs on
3. The main valve that controls pressurisation in flt.
The delector and large valve close and the main vlv will start to modulate when the throttles are opened for T.O. During the T.O. roll the a/c will pressurise to 500 ft below airfield pressure.
DC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 3 Reply 3, posted (4 years 2 months 3 weeks 1 day 23 hours ago) and read 5422 times:
Quoting VC-10 (Reply 2): It is the outflow valve. It comprises of three units. Working Fwd to Aft :-
1. An Air deflector
2. A large valve that is open on the ground to prevent to a/c pressurising on the ground with the Air Cond Packs on
3. The main valve that controls pressurisation in flt.
The delector and large valve close and the main vlv will start to modulate when the throttles are opened for T.O. During the T.O. roll the a/c will pressurise to 500 ft below airfield pressure.
'
Also known as the Deflector, the Outflow Valve, and the Thrust Recovery Valve.
113312 From United States of America, joined Apr 2005, 516 posts, RR: 1 Reply 4, posted (4 years 2 months 3 weeks 1 day 21 hours ago) and read 5332 times:
DC-10 Tech is 100% correct. All three of these devices are mechanically linked and controlled by the pressurization controller. Some operators takeoff with Packs ON and others normally takeoff with the Packs OFF. With the latter situation, you will observe the valves drive closed at the start of the takeoff roll as the Pressurization controller attempts to maintain cabin pressure at field elevation. In fact, the auto controller strives to maintain field pressure in the cabin until the aircraft has climbed to 5000 feet above the field just in case the crew needs to return for a landing.
DC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 3 Reply 5, posted (4 years 2 months 3 weeks 1 day 20 hours ago) and read 5273 times:
Quoting 113312 (Reply 4): With the latter situation, you will observe the valves drive closed at the start of the takeoff roll as the Pressurization controller attempts to maintain cabin pressure at field elevation.
Actually, the controller takes input from the #2 throttle (if I remember correctly) and when the throttle is advanced for takeoff, the outflow valve is closed to capture field elevation cabin pressure, which is maintained until 5,000 feet as you stated.
DC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 3 Reply 7, posted (4 years 2 months 3 weeks 1 day 15 hours ago) and read 5155 times:
Quoting Airfoilsguy (Reply 6): Whats all this interest in DC-10s lately? Seems to be a lot of DC-10 threads all of a sudden.
CosmicCruiser From United States of America, joined Feb 2005, 2045 posts, RR: 18 Reply 8, posted (4 years 2 months 3 weeks 1 day 6 hours ago) and read 5062 times:
I've actually had more than one GA pilot call the tower and ask them to tell us we had a door open on the left side before we takeoff. Nice thought but wrong.
DC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 3 Reply 9, posted (4 years 2 months 3 weeks 1 day ago) and read 4921 times:
Quoting CosmicCruiser (Reply 8): I've actually had more than one GA pilot call the tower and ask them to tell us we had a door open on the left side before we takeoff. Nice thought but wrong.
DC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 3 Reply 11, posted (4 years 2 months 3 weeks 20 hours ago) and read 4801 times:
Quoting OPNLguy (Reply 10): I noticed that too. Not every day that you see an 8 year old thread resurrected...
Holy crap, I didn't realize it was that old. I swear, it was under 'similar topics' so I just clicked on it and responsed.
WestWing From United States of America, joined Feb 2005, 2075 posts, RR: 8 Reply 12, posted (4 years 2 months 3 weeks 18 hours ago) and read 4749 times:
In case anyone is interested - a photo illustrating some of the things VC-10 described eight years ago can be found in Reply # 14 of: What's This Little Door On The DC-10? (by Starlionblue May 2 2005 in Tech Ops)
The best time to plant a tree is 40 years ago. The second best time is today.
OPNLguy From , joined Dec 1969, posts, RR: Reply 13, posted (4 years 2 months 3 weeks 17 hours ago) and read 4740 times:
There was a time, long ago, when smoking was still allowed on airline flights. One of the things common to see back then was a dark streak emanating from the valve and aft along the fuselage. That'd be the residue from the cigarette smoke that was leaving the cabin...
OPNLguy From , joined Dec 1969, posts, RR: Reply 15, posted (4 years 2 months 2 weeks 3 days 8 hours ago) and read 4165 times:
Quoting NEMA (Reply 14): This topic was dealt with a long time ago on here i think....
What Is This Flap On The DC10 For? (by NEMA Jul 28 2007 in Tech Ops)
I think this very thread has you beat...
Is This Normal On A DC-10, I Don't Think So!
Aer Lingus From Ireland, joined May 2000, 1154 posts, RR: 0
Posted Sat May 20 2000 12:02:27 your local time (7 years 9 months 3 weeks 4 days 17 hours ago) and read 1837 times:
Ex52tech From United States of America, joined Dec 2006, 559 posts, RR: 2 Reply 16, posted (4 years 2 months 2 weeks 2 days 15 hours ago) and read 3956 times:
Quoting Airfoilsguy (Reply 6): Whats all this interest in DC-10s lately? Seems to be a lot of DC-10 threads all of a sudden
And......you have a problem with DC-10s
I know they are old and mostly history, but they don't do a very good job of telling you what is wrong with them. So you actually have to BE a mechanic in order to work on them, instead of just go out and do a system test.
Old airplane......you are the MCDU.
"Saddest thing I ever witnessed....an airplane being scrapped"
Jetblueguy22 From United States of America, joined Nov 2007, 1518 posts, RR: 0 Reply 17, posted (4 years 2 months 2 weeks 2 days 8 hours ago) and read 3902 times:
Quoting OPNLguy (Reply 10): Not every day that you see an 8 year old thread resurrected...
Wow. I though after a few months you couldn't respond to a thread that has been idle.
Blue
Asturias From Spain, joined Apr 2006, 1767 posts, RR: 19 Reply 19, posted (4 years 2 months 2 weeks 19 hours ago) and read 3655 times:
Quoting OPNLguy (Reply 13): There was a time, long ago, when smoking was still allowed on airline flights. One of the things common to see back then was a dark streak emanating from the valve and aft along the fuselage. That'd be the residue from the cigarette smoke that was leaving the cabin...
While you're clearly not being serious, this it tech/ops so I'll say it: No, way could you see cigarette smoke residues leaving the cabin. The visible smoke is because of ash and tar particles, which are filtered by the air-filtration system.
OPNLguy From , joined Dec 1969, posts, RR: Reply 20, posted (4 years 2 months 2 weeks 17 hours ago) and read 3615 times:
Quoting Asturias (Reply 19): While you're clearly not being serious, this it tech/ops so I'll say it: No, way could you see cigarette smoke residues leaving the cabin. The visible smoke is because of ash and tar particles, which are filtered by the air-filtration system.
Granted, but as I'm sure you figured out, the crud sticking to the fuselage aft of the valve is the residue from the smoke. Sorry I wasn't more clear....
Ex52tech From United States of America, joined Dec 2006, 559 posts, RR: 2 Reply 21, posted (4 years 2 months 1 week 3 days 12 hours ago) and read 3301 times:
Quoting Asturias (Reply 19): While you're clearly not being serious, this it tech/ops so I'll say it: No, way could you see cigarette smoke residues leaving the cabin.
Seriously, the tar in the cigarette smoke would leave a black streak on the outside of the fuselage where ever the leak was. That is on aircraft that exchanged the cabin air every two minutes. The door seal leaks were easy to find back then.
The 727-100 originally had pneumatic actuated outflow valves, they were round and extended to plug the hole, the cigarette tar would make them stick, and I'm not blowing smoke here.
"Saddest thing I ever witnessed....an airplane being scrapped"
DocLightning From United States of America, joined Nov 2005, 14050 posts, RR: 55 Reply 22, posted (4 years 1 month 6 days 1 hour ago) and read 2576 times:
Quoting Ex52tech (Reply 21): The 727-100 originally had pneumatic actuated outflow valves, they were round and extended to plug the hole, the cigarette tar would make them stick, and I'm not blowing smoke here.
This entire sentence was constructed just so you could use that pun, right?
I'm terribly sorry, but if you read the board rules, there are strict punishments for bad puns.
All right boys! Hog-tie him and get out the vaseline, rubber chicken, jumper cables, propeller beanie, and the fishing line!
DC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 3 Reply 23, posted (4 years 1 week 6 days 13 hours ago) and read 2012 times:
Quoting Ex52tech (Reply 16): I know they are old and mostly history, but they don't do a very good job of telling you what is wrong with them. So you actually have to BE a mechanic in order to work on them, instead of just go out and do a system test.
Old airplane......you are the MCDU.
The -10 is a great plane and if you do your homework its really quiet easy to troubleshoot all of its systems. Having worked the MD-11 along side of the DC-10, I must agree that many techs have lost their dog fighting skills when it comes to troubleshooting. If the MCDU doesn't tell them there's a fault and point to the component, they're lost at how to fix it. That's when the old DC-10 guru's step in and actually troubleshoot the system.
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