The pilot-in-command shall only commence a flight if the reserve fuel or ballast carried on board the balloon is sufficient to ensure a safe landing.
AMC1 BOP.BAS.110 Fuel and ballast supply and planning
ED Decision 2018/004/R
General
The pilot-in-command should only commence a flight if the reserve fuel or ballast is sufficient for 30 minutes of flight.
Notwithstanding (a), the pilot-in-command should only commence a flight if the reserve fuel (for the burner, and, in case of hot-air airships, also for the engine) or ballast is sufficient for 15 minutes of flight for:
hot-air balloons equipped with a single fuel tank; and
hot-air airships, when the flight is conducted in the vicinity of the operating site.
Fuel or ballast supply calculations should be based upon at least the following operating conditions under which the flight is to be conducted:
data provided by the balloon manufacturer;
anticipated masses;
expected meteorological conditions; and
air navigation services provider procedures and restrictions.