US 12,241,422 B2
Aircraft operation
Benjamin J Keeler, Derby (GB); David M Beaven, Nottingham (GB); Craig W Bemment, Derby (GB); Paul W Ferra, Derby (GB); Kevin R McNally, Derby (GB); Andrea Minelli, Derby (GB); and Martin K Yates, Northamptonshire (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE PLC, London (GB)
Filed on Jun. 21, 2023, as Appl. No. 18/212,290.
Application 18/212,290 is a continuation of application No. 17/853,333, filed on Jun. 29, 2022, granted, now 11,859,565.
Claims priority of application No. 2118650 (GB), filed on Dec. 21, 2021.
Prior Publication US 2024/0117771 A1, Apr. 11, 2024
Int. Cl. F02C 9/28 (2006.01)
CPC F02C 9/28 (2013.01) [F05D 2220/323 (2013.01); F05D 2240/35 (2013.01); F05D 2270/3013 (2013.01); F05D 2270/303 (2013.01); F05D 2270/309 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of determining at least one fuel characteristic of a fuel provided to a gas turbine engine of an aircraft, the gas turbine engine forming part of a propulsion system, the method comprising:
making an operational change, the operational change being effected by a controllable component of the propulsion system and arranged to affect operation of the gas turbine engine;
sensing a response to the operational change; and
determining the at least one fuel characteristic based on the response to the operational change,
wherein the at least one fuel characteristic comprises at least one of:
i. percentage of sustainable aviation fuel in the fuel;
ii. sulphur content of the fuel;
iii. oxygen content of the fuel;
iv. thermal stability of the fuel; and
v. an indication that the fuel is a fossil fuel.