Itīs around 640kg/h. For BOTH ATR 42 and 72.
Well say a typical flight from Hovden to Oslo Gardermoen
Distance: 350 km, 1 h flight time.
JAR Fuel Policy are following.
5% En Route Time: 0,05h= 3 min
Alternate Airport is ENTO: 0,25h=15 min
Final Reserve Fuel: 0,5h= 30 min.
Total Trip Time: 1,8h= 1 h 48 min
Fuel burn was around 640kg/h...640*1.8= 1152 kg Takeoff Fuel
We estimate 100% cabin factor on todays flight wich is 74 pax.
84kg pax+11 kg baggage= 95kg per person
74*95= 7030kg payload
OEW 12950kg
TOW=ZFW+FOB 12950+1152+7030= 21132 kg TOW
Your TOW is 1670kg under MTOW
At MTOW and ISA ATR 72 needs 1333m of runway
We are quite close to MTOW so i guess we don't make it with this payload.
DON'T FORGET THE SLOPE OF OVER +/- 2% SLOPE....
ATR 42
Seating capacity is various depending on choice. But say 45 pax.
Payload: 4275kg
Fuel:1152kg
OEW: 11250kg
TOW: 16677 kg wich is 1923 kg under MTOW
MTOW TODR ISA is 1165 m...
With the slope even this operation would be impossible...
NOTE: It's ok to go with lower payload and thereby lower TOW to meet
the actual MTOW for the runway under given conditions