US 12,331,692 B2
Flight profile
Peter Swann, Derby (GB); Craig W Bemment, Derby (GB); Alastair G Hobday, Derby (GB); Benjamin J Keeler, Derby (GB); and Christopher P Madden, Derby (GB)
Assigned to ROLLS-ROYCE PLC, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on May 31, 2023, as Appl. No. 18/203,993.
Application 18/203,993 is a continuation of application No. 17/853,074, filed on Jun. 29, 2022, granted, now 11,815,031.
Claims priority of application No. 2118656 (GB), filed on Dec. 21, 2021.
Prior Publication US 2024/0077036 A1, Mar. 7, 2024
Int. Cl. F02C 9/28 (2006.01); B64D 27/10 (2006.01); B64D 37/04 (2006.01); G08G 5/32 (2025.01)
CPC F02C 9/28 (2013.01) [B64D 27/10 (2013.01); B64D 37/04 (2013.01); G08G 5/32 (2025.01)] 14 Claims
OG exemplary drawing
 
1. A method of operating an aircraft comprising a gas turbine engine and a fuel tank arranged to provide fuel to the gas turbine engine, the method comprising:
determining at least one fuel characteristic of the fuel arranged to be provided to the gas turbine engine; and
proposing or initiating a change to a flight profile of the aircraft based on the at least one fuel characteristic,
wherein the at least one fuel characteristic of the fuel comprises at least one of:
i. percentage of sustainable aviation fuel in the fuel;
ii. percentage of nitrogen-containing species in the fuel;
iii. presence or percentage of a tracer species or trace element in the fuel;
iv. hydrogen to carbon ratio of the fuel;
v. percentage composition information for hydrocarbons present in the fuel;
vi. naphthalene content of the fuel;
vii. oxygen content of the fuel;
viii. thermal stability of the fuel; and
ix. level of coking of the fuel.