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-   Regional (https://www.airlinepilotforums.com/regional/)
-   -   CRJ Door / Pressurization Question (https://www.airlinepilotforums.com/regional/28291-crj-door-pressurization-question.html)

BlueMoon 07-05-2008 08:25 AM
Originally Posted by cyrcadian (Post 418907)
Isn't there a story floating around of a Comair FA who accidentally tried to open the door in flight? Something about the outer handle popped out in cruise and the crew asked her to pull it back in, instead she actuated door lever thingy (technical term).
Haven't heard that one.

I have gotten the PAX DR OUTR HANDLE caution before (not sure if that is the proper wording)...we didn't ask the FA to touch it in fear of that very confusion. We were in the terminal area anyway.

JasonGerald 07-05-2008 08:31 AM
Originally Posted by cyrcadian (Post 418907)
Isn't there a story floating around of a Comair FA who accidentally tried to open the door in flight? Something about the outer handle popped out in cruise and the crew asked her to pull it back in, instead she actuated door lever thingy (technical term).
I worked at Comair for 8 plus years and never heard about a story like that. However a Comair flight attendant had a finger severed as she tried to close the door from the outside. It was a windy day and the door slammed shut with her hand clutching the inside of the door. I never met her but she would come into ground school and talk about the incident.

BlueMoon 07-05-2008 08:33 AM
Originally Posted by JasonGerald (Post 418911)
I worked at Comair for 8 plus years and never heard about a story like that. However a Comair flight attendant had a finger severed as she tried to close the door from the outside. It was a windy day and the door slammed shut with her hand clutching the inside of the door. I never met her but she would come into ground school and talk about the incident.

Holy Crap. Why would you grab the inside/side of the door? I'm not tall enough, so that isn't evne an option for me...I just shove and walk it up with my hands.

rickair7777 07-05-2008 08:42 AM
Originally Posted by BlueMoon (Post 418897)
That is the same amount of pressure on the pins, I'm going to say it would be near impossible to rotate the cams with that much pressure on it...the handle would snap first.
Wrong! The static coeffecient of friction for steel-on-steel (coated in grease) is amazingly low. Those pins would slide right out.

The PSEU sensor for the cabin door cannot be MEL'ed (I tried last week). It's a red message.

MatthewAMEL 07-05-2008 08:53 AM
CHQ had an incident in IAH where a FA was injured by opening the main cabin door while the A/C had a small amount of pressurization remaining. The door came open so fast and with so much force, she was thrown onto the ramp. She was badly injured.

As a -200 PIC for a while, that was my 2nd least favorite thing about the A/C. (inability to disconnect the engine driven HYD pump was #1 - it forced an in-flight shutdown and RTB once).

BlueMoon 07-05-2008 09:20 AM
Originally Posted by rickair7777 (Post 418918)
Wrong! The static coeffecient of friction for steel-on-steel (coated in grease) is amazingly low. Those pins would slide right out.

The PSEU sensor for the cabin door cannot be MEL'ed (I tried last week). It's a red message.
The coeffeicent of friction doesn't have to be very high when your talking about 20,000 pounds.

Looking at a couple of websites, the Co-efficient of friction for steel on steel lubricated is around .15 (http://www.carbidedepot.com/formulas...icient.htm)for about 20k pounds that would take about 3000pounds of force to break it free. given about a 3 foot door handle (a lever) it would take possible 1000 pounds exerted by the FA to pull the handle.

I'm sure as hell not going to go and try it, but I still think it isn't very easily done.

soon2bfo 07-05-2008 09:30 AM
Originally Posted by MatthewAMEL (Post 418924)
CHQ had an incident in IAH where a FA was injured by opening the main cabin door while the A/C had a small amount of pressurization remaining. The door came open so fast and with so much force, she was thrown onto the ramp. She was badly injured.

As a -200 PIC for a while, that was my 2nd least favorite thing about the A/C. (inability to disconnect the engine driven HYD pump was #1 - it forced an in-flight shutdown and RTB once).
Except that incident involved the galley door.

rickair7777 07-05-2008 09:41 AM
Originally Posted by BlueMoon (Post 418948)
The coeffeicent of friction doesn't have to be very high when your talking about 20,000 pounds.

Looking at a couple of websites, the Co-efficient of friction for steel on steel lubricated is around .15 (http://www.carbidedepot.com/formulas...icient.htm)for about 20k pounds that would take about 3000pounds of force to break it free. given about a 3 foot door handle (a lever) it would take possible 1000 pounds exerted by the FA to pull the handle.

I'm sure as hell not going to go and try it, but I still think it isn't very easily done.
Hard steel is less than .10, maybe half that. I don't know, but I'm assuming that those pins are not mild steel or iron.

The linear calculation applies to two flat surfaces with all force applied perpendicular. Since the pins and their holes are cyclindical, the math would be different (I'm not doing calculus on saturday :rolleyes: ). But I wouldn't want to try it either.

ThunderChicken 07-05-2008 09:55 AM
Sounds like a new episode for Mythbusters...

BlueMoon 07-05-2008 10:02 AM
Originally Posted by ThunderChicken (Post 418964)
Sounds like a new episode for Mythbusters...
Why not, there are enough Rj's in the desert to try it out on.


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