ATR-42
 

I recently asked ATR for a similar request but for an ATR-42 at a 1000 meter sea level 30 degree Celsius runway. Here is their reply.

"
Assumptions :
1,000 runway length
30 deg C OAT
sea level
hard paved runway
dry surface
no slope
no wind
no obstacles
FAR landing factor (0.6)

ATR42-300 (engine PW120)
MTOW : 15,560 kg
MLW : 15,755 kg (landing flap 30 deg)
Landing performance can be improved up to 16,400 kg (max structural landing weight) by either the application of flap 45 deg or the application of the steep slope approach with performance credit at flap 30 deg.

Both cases are approved by European authorities but require FAA derogation when FAR applies

ATR42-320 (engine PW121)
MTOW : 15,679 kg
MLW : 15,755 kg (landing flap 30 deg)
Landing performance can be improved up to 16,400 kg (max structural landing weight) by either the application of flap 45 deg or the application of the steep slope approach with performance credit at flap 30 deg.

Both cases are approved by European authorities but require FAA derogation when FAR applies

ATR42-500 (engine PW127E)
MTOW : 16,687 kg (standard take-off procedure)
MTOW : 17,243 kg (Full RTO procedure: both engines at 100% at brake release)
MLW : 15,582 kg (landing flap 35 deg)
Landing performance can be improved up to 18,300 kg (max structural landing weight) by the application of the steep slope approach with performance credit at flap 35 deg.

Approved by European authorities but requires FAA derogation when FAR applies "

It can probably do the 850 meter runway as well, but with what weight restriction?