Our 2014 and current 2019 Airstream seem to have the same door hardware. Both seem to have similar aches and pains. For you, not the door. It has been too long ago with our 2006... but it may also be identical. Same techniques to keep working.
Philips Screwdriver. Mid sized needed. Light oil (whichever may be sitting on a shelf. Engine oil, 3 in one... WD 40 IF the hardware is rusty or you need to get further inside the working mechanism).
All these screws are inside or on the outside edge of the door. None are exposed on the outside for good reason... The rubber is a bit snug when NEW. As your Airstream wears out... or you do... it becomes easy open and close. I am beyond wearing out. I am a Neanderthal. Been around a long time.
The Front Door Plate:
Snug the three philips screws. Snug. (Not to strip the threads.) Light oil the moving parts. Too much is worse than too little. You can always add a drop or two. If the door was a bit tough to latch to the frame, you may need to loosen the three large screws holding the plate, align, snug them up and 'give the door a swift hard swing'. Open with the exterior latch. Does it open with a crisp snap? Try again. Like it? Snug them up. (If this is your first time, have someone inside if you really overdid the 'loosen the screws'. Loosen just enough to move the plate if needed. If the door has always been perfect, the oil will make it even better.
Having someone inside the trailer to operate the handle opening mechanism is advised. Beats climbing through an open window if you lock yourself out...
Some doors you need to press against the side of the door, pull the latch for the crisp snap... opening. If stubborn either way... now you have a bit of figuring out what has changes. These are simple... and OIL is often the missing ingredient.
Sliding Dead Bolt:
The sliding dead bolt has 2 screws. Snug them up. Wipe off the dead bolt and light oil. This should be snug, but easily lock and unlock.
Screen Door hardware:
Eight metal screws between the two screens. They back out after several trips. Align and snug them up. Done.
Edge of Door Plate Locking Assembly:
Large philip screws hold this together. If one or both are Loose... that is unusual. Mine have always been snug. If this comes apart... you cannot exit or enter as I know. Just snug them up... they should not move at all. Spray some WD40 into the assembly. Or oil. The door should close with a swift hard swing. Pull the outside door release and it should be a Crisp Release sound. You will know the difference. If you have to TUG at the lever... press the edge of the door edge and it should be a Crisp Release.
At least your Entry and Exit will be taken care of.... Not Yet.
Oil the door hinges:
From the top below the aluminum castings. Open the door about five or six inches. You should be able to grab the outside bottom door edge and LIFT UP. It should move up. If not, open or close the door so it does. Have someone add liberally an Oil (car oil I like) and move the door up and down so the oil runs down the 'hinge pin'. If the door squeaks... it needs this done. The squeak is friction and the pin is getting worn with grit and no lubrication.
Screen Door wearing into the Lower Door Frame? This will make it difficult to open and close the entire door. It is towards the side where it hinges. Look where the screen door frame meets the heavy aluminum frame. You see an edge cutting in... that needs to be fitted with sanding the screen door edge. Just another Thread is needed to explain...
After the door hinges are oiled... you will get excess black oil running out. Wipe it off. Add some more. Repeat the oiling process. Wipe off the excess ten minutes later. Maybe oil the screen door hinges too. It is messy. You will need paper towels. It will save you A LOT OF MONEY in the future.
Many complain about the door latching and not. This requires some dirty work and some snugging up hardware, if needed. If it were easy... you could find a chipmunk fix it for peanuts... Ha Ha... Oh well. You get the idea.
The End... if there ever was one. How did this work for you? I expect

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