|Quoting FlyDeltaJets87 (Reply 1):|
Someone could correct me if I'm wrong, but I think the L1011 had doors like this to.
|Quoting RyanAFAMSP (Reply 6):|
But my fear was always that in more excessive emergencies, the power assist mechanisms would fail, and the fuselage would bend - making it impossible for the doors to smoothly retract into the ceiling.
This is why the ultra-simple, old-school 747 plug doors made so much sense to me. Though they also had power assist bottles to blow the doors open in an emergency, you weren't fighting gravity in the event that the accident.
|Quoting 57AZ (Reply 9):|
Don't forget that the Lockheed Constellations had sliding doors too.
|Quoting TristarSteve (Reply 13):|
the L1 door on the B737 is a disgrace.
|Quoting Dougloid (Reply 11):|
Its that big spring that worries me
|Quoting 474218 (Reply 17):|
Quoting Dougloid (Reply 11):
Its that big spring that worries me
That is not one spring, inside the counterbalance there are seven (7) titanium springs, five (5) on the small type 1 door counterbalances. When removed from the housing these springs are six feet long when they are removed from the unit. The entire package is a small package of energy. I referred to them as "mechanical bombs".
In an emergency the counterbalance would fully open an L-1011 passenger door and deploy the slide, in less than 4.5 seconds.
|Quoting Dougloid (Reply 18):|
HS125/DH125 series, at least the older ones I'm familiar with they had the cabin door counterbalanced with some kind of spring arrangement so that it was pretty easy to slide open *up and in* once you popped the latch.
|Quoting WNCrew (Reply 20):|
Both back doors of the 737 are easy though.....they're seated well and not at an odd curvature point on the fuselage. I wonder if Boeing didn't just leave the doors as they are b/c they have a simplistic design. The slides are easily accessed, no recessed arming/disarming mechanism,
|Quoting Dougloid (Reply 21):|
The MD11 used a 'girt bar' in the doorway. When the slide was armed the door would go up but the girt bar stayed in place and out came the slide. It was possible to pop the slide inside the cabin and there were a couple incidents of it happening while the mechs were working on the doors.
|Quoting JetMech (Reply 23):|
IIRC, there is no external slide disarm mechanism on the 747.
|Quoting WNCrew (Reply 22):|
Did you actually touch the girt bar when arming/disarming the door?
|Quoting WNCrew (Reply 25):|
Also: My point above was that perhaps given the complexities of arming/disarming assemblies on larger planes (hidden arming/disarming lifts, catches etc) Boeing kept it simple by simply having the FA place and remove the Girt Bar by hand. This is very simplistic and provides less chance of things to break since really you'r eonly dealing with the Girt Bar itself.
|Quoting TristarSteve (Reply 26):|
If you open a B747 door from the outside, the door is automatically disarmed.
|Quoting JetMech (Reply 32):|
Is the slide disarmed from the outside when you pull the extrnal butterfly handles outwards?
|Quoting MarkHKG (Reply 33):|
The B-747 door is automatically disarmed when the Handle Release Button is pushed inwards...I think...
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