R2-
As GB says, your dispatch section must have this information available to them to legally dispatch the flight. For a quick reference, you can check the runway length for landing on the Jepp 10-9A.
The rules are quite similar for 121 and 135 operations in this regard, but are often misunderstood by even the most experienced flight crews.
You will note that 135.385 states that "no person operating"....."may TAKEOFF that airplane at a weight".......(emphasis mine). It does NOT say ......no person may takeoff or LAND that airplane.
135.385 (and 121.195) are FARs that govern dispatch of the flight, although the compliance with the FAR rests with the PIC, because the dispatcher has no control over how much fuel is actually burned during taxi, etc.
It's also important to note that flights are dispatched to AIRPORTS, not runways. Although the airport must have runways that meet the requirements of 135.385 (b)(1) and (2)...and 121.195 (b) (1) and (2), there is no legal requirement to land on any particular runway. Once again, "no person may takeoff".....etc.
Now the questions is: What do I do if there is a runway change at the destionation,...or....what if I find there was less headwind enroute (which makes me heavier for landing),....or less headwind on landing which will increase my landing distance, etc. If you took off at or close to your MTOW for landing, you may find that you aren't within the 60% any longer.
There is no legal requirement to use only 60% of the runway for landing. You are legal to use all of it.
(Disclaimer- I speak to the US rules only, your state may differ.)
