737 Over wing exits

[embpic1]

I was just looking at the Turkish 737 in Amsterdam and noticed the over wing exits are hinged at the top and they fold up. Is that a Turkish thing (option) or is that the way Boeing is doing them now?

 

[Homer Jay]

They're like that on all the NG's.

 

[ImbracableCrunk]

They're very slick. Pop off the cover, pull the handle. Kinda like a Delorean without the time travel.

 

[Donsa320]

DC-3's were hinged at the top also. The more things change, the more they stay the same.

 

[yoyoma]

"very slick"

unless you crash upside down

 

[Fubijaakr]

They'll still open. Unless the fuselage is on top of them.

 

[get2flyin]

They're hinged and open out? I thought doors that just popped outward were the bane of pressurized jets. That's why we had to pull the old doors in and then set on the seat. You never had to worry about a Pax opening a door in flight because you might have upwards of 8.5 psi holding it shut.

Cool! How does it work?

 

[firstthird]

they are locked shut if the engines (or maybe just #2, I forget) are above a certain RPM.

the other 'interesting' feature is that you need to open them with your palm up, if you stick your hand in palm down, which seems natural, the door opens with such speed and force that you may have a broken forearm for your trouble.

 

[HalinTexas]

PSEU switch. Proximity Switch Electronic Unit. Glorified "squat switch." Controls the locking of the doors when power levers advanced for flight. In a nutshell.

 

[CRJ's suck]

I thought they weren't locked until groundspeed reached 40 kts. I may be wrong though, it's happened before.

 

[CRJ's suck]

Just found it. controlled by logic gates. Left OR right engine running. BOTH thrust levers >53 deg and airplane in the air mode. Then the doors will lock.

 

[ultrarunner]

I'm interesting in Boeing's logic for the change over the plug-type. The hinge-door, locking pins, locking mechanism all points to more weight, etc.

Was it an issue with evacuation timing of the larger 73's?

Just curious.

 

[Bringupthebird]

PSEU switch. Proximity Switch Electronic Unit. Glorified "squat switch." Controls the locking of the doors when power levers advanced for flight. In a nutshell.

I rented a Chevy that did the same thing.

 

[CA1900]

Hahahahaha... :laugh:

 

[propsarebest]

I'm interesting in Boeing's logic for the change over the plug-type. The hinge-door, locking pins, locking mechanism all points to more weight, etc.

Was it an issue with evacuation timing of the larger 73's?

Just curious.

Not to mention the two big @$$ springs that throw the door open...

 

[Amish RakeFight]

I rented a Chevy that did the same thing.

My car can be programmed to do that but it's too weird. Feels like K.I.T.T. is in command.

 

[ultrarunner]

Not to mention the two big @$$ springs that throw the door open...

No kidding. Engineers don't over-design something because they WANT to (excluding Marcel). Must have been a change in a requirement somewhere.

 

[ASApuppy]

I'm interesting in Boeing's logic for the change over the plug-type. The hinge-door, locking pins, locking mechanism all points to more weight, etc.

Was it an issue with evacuation timing of the larger 73's?

Just curious.

you can credit the JAA for forcing Boeing's hand on changing the doors from the Plug type. Actually, the first 50 or so NG's were made with plug doors. The JAA came in and determined that the door weighed 1 kilo too much for their model of the average pax that will have to pop it open and throw it out. They refused to budge after months of negotiations. Boeing thought about only changing the European airplanes to the now standard hinged door. But, in the end, they wanted it as part of the basic certification and every aircraft would have them. So, big tents were assembled of the aircraft that were already built and out on the flightline in Renton. It was about a 2 month mod for each airplane. That was one of the big delays that slid the delivery of the airplane to SWA.