It’s OK geting them in, it’s geting them out you have to think about! 900′ is doable if you wait for the wind etc but getting out is another question. A Pawnee would manage it with a ten knot headwind, half fuel and standard day (plus a not knackered donk and a pilot who knew what he was doing).

Plus you have to think about what if you don’t have a headwind and it’s 30C.