Borrowed this from an old mate - Thanks old mate.
I hoped it may help with the thought process, it's for a 'Chieftain' but you'll get the idea.
Aerodromes with less than a 1000 meter sealed strip should be considered critical. It is not that the aircraft cannot take off from a shorter distance, however, if the aircraft cannot SAFELY GO, logically, it must be able to SAFELY STOP. The take off is considered critical.
PIC should not attempt a take off from a strip or runway which has a TODA less than the TORR equivalent to ASD under the ambient (WAT) conditions. A 60 meter clearway may be used in the calculation SOP reduce the HWC by 50%, down wind take off is forbidden.
PA 31 – 350 can, at MTOW operate from a little as 870 meters. The accelerate stop distance (ASD) required for the same weight is approximately 1300 meters. The accelerate go distance is longer again, approximately 1800 meters although the manufacturer does not provide this information.
PA 31 350.- Example. For a Max gross Take off (25°C/ 0 wind) The minimum length chart requires 822 metres. The ASD chart calls for 1158 metres. CAO 20.7.4. factors for the minimum length (850 meters) by 1.226. The minimum length requirement becomes 1008 metres which allows a MTOW of 2744 kg, this weight will allow a further refining to define the actual factor for the weight.
PA 31 350. - Example. The Vmca for the type is placed at 76 KIAS, Vsse is placed at 92 KIAS. The OEI rate of climb speed is placed at 106 KIAS at MTOW. There is a 21 knot speed deficit to recover from a Vr of 85 knots and 14 knots from Vr of 92 knots to achieve VYSE. TOSS 95 knots only provides a margin over the stall, and does not imply climb performance. The need to achieve some form of climb performance is obvious.
E&EO accepted - I did cherry pick the entire thing for the nuggets. Anyway - it's worth a thought or two.