The DHC8-100/300 has a limitation regarding cabin differential pressure for take off and landing to be less than 0.5
During normal ops. we only adjust field elevation to equal that of landing airport, and cabin alt should descent at 300fpm.
In our DH1 landing with bleed on and beed rate selector at MIN is approved,which means that we have to reduce bleed rate to MIN as a part of before landing checklist. Normaly at this time cab diff pressure is also 0,5 or less.
Sometimes if we do our before landing check early (at higher alt) or descend steeply without increasing cabin rate of descend accordingly we can end up with too high cabin diff pressure.
To my understanding this is best solved by turning bleed flow to MIN and thus limit amount of pressurized air into cabin which should increase cabin alt and thus decrease cabin diff press. What makes me confused is that sevral commanders have the oppinion that bleed air flow should be MAX until desired diff press is obtained.
Could anyone please clearify
thanks