US 12,258,139 B2
Ground-based aircraft movement
Stephen A. Witalis, Glastonbury, CT (US); Ramesh Rajagopalan, Glastonbury, CT (US); and Manuj Dhingra, Glastonbury, CT (US)
Assigned to RTX CORPORATION, Farmington, CT (US)
Filed by RTX Corporation, Farmington, CT (US)
Filed on Jan. 11, 2023, as Appl. No. 18/152,920.
Claims priority of provisional application 63/299,154, filed on Jan. 13, 2022.
Prior Publication US 2023/0219693 A1, Jul. 13, 2023
Int. Cl. F02C 6/00 (2006.01); B64D 27/10 (2006.01); B64D 27/24 (2006.01); B64D 31/06 (2006.01); F02C 7/26 (2006.01); B64D 27/02 (2006.01)
CPC B64D 31/06 (2013.01) [B64D 27/10 (2013.01); B64D 27/24 (2013.01); F02C 6/00 (2013.01); F02C 7/26 (2013.01); B64D 27/026 (2024.01); F05D 2260/85 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An engine system for an aircraft, the engine system comprising:
a gas turbine engine;
a control system configured to:
motor the gas turbine engine, absent fuel burn, during a taxi mode of the aircraft;
accelerate a motoring speed of the gas turbine engine, absent fuel burn, above an idle speed of the gas turbine engine to provide propulsion during the taxi mode; and
decrease the motoring speed of the gas turbine engine, absent fuel burn, based on a change in a starting mode of the gas turbine engine or the aircraft reaching a targeted new position, wherein the motoring speed is driven by a motoring source comprising one or more of: an electric motor, a pneumatic drive, and a hydraulic drive powered by one or more of: an auxiliary power unit, a battery system, an electric generator, a hydraulic source, and a pneumatic source, and selection of the motoring source used to accelerate the gas turbine engine above the idle speed, absent fuel burn, changes between two or more taxiing events, wherein the idle speed comprises a lowest speed at which the gas turbine engine is operable with fuel burn when the aircraft is on ground.