You are seriously so full of it
Ummm...I do the same thing. I fly 30 year old planes and most certainly have a fudge factor in place, particularly in terms of accel/stop and accel/go planning. I hate to sound like I'm sitting here fighting ppragman's battles, but he's yet to say anything on this thread I disagree with. :dunno: I come from 121, and have a significant 135 background as well.
Listen, 121 is very cut and dry. At least when I was in 121, we had performance charts for
every runway we were authorized to use; it was very comprehensive and covered just about every little possibility, measured down to the pound in terms of MATOW. Plug it all into the FMS, and off we go.
Much of 135 is not nearly that black and white. The performance charts in my current ride take wind into account, and that's it. It says nothing about runway condition, slope, different flap settings, etc. It's a basic guide that works when everything is perfect. However, I spent all winter landing on ice/slush covered runways, sometimes at reduced flap settings because I had ice all over the tail boot. I used my experience to decide which runway I needed, and where I should touch down. Same goes for short runways; 33R in BOS is a great example. It's a 2557' runway that's
technically legal up to MLW. However, in my experience, I won't do it at greater than 6500#. Just my experience. It's not written down in any of the books, but hey, I haven't come close to killing anyone yet.
That's the 135 environment. That's what pilots outside of 121 do on a
daily basis. It's not always cut and dry. Sometimes you just have to get out there and get the job done, making sure you leave yourself enough outs. Nothing cowboy about it, nothing wrong about it. It's just a different segment of the industry that many in 121 (particularly regionals) haven't seen and don't understand.