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Door Gap On MD-81 Before T/O  
User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Posted (5 years 7 months 5 days 9 hours ago) and read 3576 times:

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?

6 replies: All unread, jump to last
 
User currently offlinePGNCS From United States of America, joined Apr 2007, 2834 posts, RR: 45
Reply 1, posted (5 years 7 months 5 days 9 hours ago) and read 3556 times:



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.


User currently offlinePilotboi From United States of America, joined Sep 2007, 2366 posts, RR: 9
Reply 2, posted (5 years 6 months 4 weeks 1 hour ago) and read 3110 times:



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.


User currently offlineDALMD88 From United States of America, joined Jul 2000, 2574 posts, RR: 14
Reply 3, posted (5 years 6 months 3 weeks 6 days 8 hours ago) and read 2869 times:

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.

User currently offlineBoeing767mech From United States of America, joined Dec 2000, 1029 posts, RR: 3
Reply 4, posted (5 years 6 months 3 weeks 6 days 8 hours ago) and read 2862 times:



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
User currently offlineKELPkid From United States of America, joined Nov 2005, 6411 posts, RR: 3
Reply 5, posted (5 years 6 months 3 weeks 6 days 8 hours ago) and read 2860 times:

Aren't you supposed to be studying for your CFI oral/checkride?  Silly


Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Reply 6, posted (5 years 6 months 3 weeks 6 days 7 hours ago) and read 2844 times:

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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