As a rule, while establishing the departure procedures, the operator reckons that aeroplane has a climb gradient of:
3.3% with all engines operating
5% with all engines operating and a climb gradient margin respectively of 0.8%, 0.9%, 1% with two, three and four engines, taking in account one engine inoperative
2.4% with all engines operating and 1.5% with one engine inoperative
2.4% with two engines, 2.7% with three engines, 3% with four engines