Fly2HMO
Posts: 7207
Joined: Sat Jan 24, 2004 12:14 pm

Door Gap On MD-81 Before T/O

Wed Mar 25, 2009 10:03 pm

I couldn't help noticing the caption of one of today's top pictures:


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Photo © Simon Brygg - Ostersund Photography



I was just curious, as the plane I've flown most often as a pax is the mad dog: will the gap close up once the differential pressure goes up and the door seals press against the fuselage? do most mad dogs do this? (certainly don't remember noticing it in all my other flights) what about other planes?
 
PGNCS
Posts: 2249
Joined: Sun Apr 15, 2007 5:07 am

RE: Door Gap On MD-81 Before T/O

Wed Mar 25, 2009 10:26 pm



Quoting FLY2HMO (Thread starter):
will the gap close up once the differential pressure goes up and the door seals press against the fuselage?

The gap will close with increasing PSID.
 
pilotboi
Posts: 711
Joined: Thu Sep 06, 2007 8:16 am

RE: Door Gap On MD-81 Before T/O

Thu Apr 02, 2009 5:52 am



Quoting FLY2HMO (Thread starter):
will the gap close up once the differential pressure goes up and the door seals press against the fuselage?

Exactly! That's how it's designed.

Quoting FLY2HMO (Thread starter):
do most mad dogs do this?

Yes. All that I've seen do.

Quoting FLY2HMO (Thread starter):
what about other planes?

I'm sure you can notice it on some others. Most modern planes' doors are flush, but the door is not completely sealed until a difference in pressure is created.
 
Dalmd88
Posts: 2544
Joined: Fri Jul 28, 2000 3:19 am

RE: Door Gap On MD-81 Before T/O

Thu Apr 02, 2009 11:06 pm

When you rig a Maddog door the inital set up only measures the gap for/aft and up/down. The plane is then pressurized and you adjust the stops out until the door is flush. Many times with a new seal they are a bear to shut until it pressurizes a few times.
 
boeing767mech
Posts: 806
Joined: Fri Dec 15, 2000 5:03 pm

RE: Door Gap On MD-81 Before T/O

Thu Apr 02, 2009 11:16 pm



Quoting DALMD88 (Reply 3):
Many times with a new seal they are a bear to shut until it pressurizes a few times.

Just like the aft plug door on a non aft staired DC-9. I don't know how many times we have had to applied kinentic energy while at 8.0 psi Dif. ti get the door to seat right after changing a door seal.

David
Never under-estimate the predictably of stupidty
 
KELPkid
Posts: 5247
Joined: Wed Nov 02, 2005 5:33 am

RE: Door Gap On MD-81 Before T/O

Thu Apr 02, 2009 11:29 pm

Aren't you supposed to be studying for your CFI oral/checkride?  Silly
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
 
Fly2HMO
Posts: 7207
Joined: Sat Jan 24, 2004 12:14 pm

RE: Door Gap On MD-81 Before T/O

Fri Apr 03, 2009 12:15 am

Thanks for the info guys

Quoting KELPkid (Reply 5):
Aren't you supposed to be studying for your CFI oral/checkride?

Hey I posted this weeks ago...

Now if you excuse me, I'm gonna go procrastinate elsewhere.  cheeky 

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