Can O-2 doors be removed?

[JimC]

I thought I saw this mentioned, but I haven't found confirmation.

Two questions:
Can O-2 doors be removed without tools?
If so, is there an STC to put O-2 doors (or O-2 door hinges) on a pre-73 skymaster?

[hharney]

Yes O-2 doors will fit the early birds. Several have done it

[Flyer770]

An example of a form 337 to put an O2 door on an early 337.

https://i.imgur.com/l8XFWKi.jpg

[JimC]

Thanks! Do the two hinges specified in the 337[form] have a pin so the door can be removed without tools?

[Flyer770]

I don’t recall offhand. I think they are similar to the regular hinges, just a heavier duty pin than the civilian birds. I’ll get to the airport Monday or Tuesday and double check. The mod was made years before I got it. I’ll bet Don Nieser at Commodore could sell you everything in one go if needed. He probably knows a bunch of different ways to do it too.

[Kim Geyer]

RT Aerospace has the STC SA00409AT

[general]

The hinges will match but the door locking mechanism is totally different. They use Carter key pins that pull right out

[rmorris]

Got the O2 door from Don Neiser In OK, and then the STC from Ray Torres at RT Aerospace.

Don (when selling the door) said it would just slap right on...when the IA doing the install had issues, Don said it takes a lot of finessing

so, it does work, and I get TONS of compliments on having the O2 door with glass all the way down....but be prepared for some work to 'fit' it into place.

you will like it in the end.

couple of other notes -
-- if you don't want to install the wind shield part of the STC, you can do it and Ray will sign off, but that voids opening the window in flight (O2 door has a cool window that cranks out)
-- there is no 'key' lock on the door...it has a clasp that you put on a physical padlock...I use a lock that has alpha characters on it, bot you could put a basic key padlock as well.

[Ed Coffman]

Mine don't come off with a pin like the ones on my 185. I you are looking for one with O2 doors I do have one for sale.

https://www.wefly4u.com/n1275m

Ed