US 9,809,319 B2
Aircraft fuel system
Stephen Burnell, Bristol (GB); and Tim Leigh, Bristol (GB)
Assigned to AIRBUS OPERATIONS LIMITED, Bristol (GB)
Filed by AIRBUS OPERATIONS LIMITED, Bristol (GB)
Filed on Jul. 9, 2015, as Appl. No. 14/795,481.
Claims priority of application No. 1412311.1 (GB), filed on Jul. 10, 2014.
Prior Publication US 2016/0009406 A1, Jan. 14, 2016
Int. Cl. B64D 37/32 (2006.01); B64D 37/24 (2006.01); B64D 37/14 (2006.01); B64D 37/10 (2006.01)
CPC B64D 37/32 (2013.01) [B64D 37/10 (2013.01); B64D 37/14 (2013.01); B64D 37/24 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method of operating an aircraft, comprising:
supplying fuel to a fuel storage facility of an aircraft fuel system of the aircraft,
transferring at least some ullage from the fuel storage facility, through a transfer arrangement, to a separate ullage storage facility, based on a pressure input to the transfer arrangement,
storing at least some of the transferred ullage in the ullage storage facility, and
transferring at least some of the stored ullage from the ullage storage facility, through the transfer arrangement, to the fuel storage facility, based on the pressure input to the transfer arrangement,
descending the aircraft to a reduced altitude level, thereby decreasing the pressure in the fuel storage facility relative to atmospheric pressure, and, at the reduced altitude level, transferring at least some ullage from the ullage storage facility, through the transfer arrangement, to the fuel storage facility, based on a pressure input to the transfer arrangement, and in-taking atmospheric air from outside the aircraft into the fuel storage facility at a first altitude and then allowing transfer of the at least some of the stored ullage from the ullage storage facility, through the transfer arrangement, to the fuel storage facility at a second, lower altitude.