GAS TURBINE ENGINE MOTORING WITH STARTER AIR VALVE MANUAL OVERRIDE
First Claim
1. A system for gas turbine engine motoring, the system comprising:
- an air turbine starter coupled to a gearbox of a gas turbine engine;
a starter air valve in fluid communication with the air turbine starter to drive motoring of the gas turbine engine responsive to a regulated pressure from a compressed air source; and
a manual override of the starter air valve, the manual override adjustable to one or more predefined intermediate positions that partially open the starter air valve to limit a motoring speed of the gas turbine engine below a resonance speed of a starting spool of the gas turbine engine responsive to the regulated pressure.
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Accused Products
Abstract
A system for gas turbine engine motoring includes an air turbine starter coupled to a gearbox of a gas turbine engine and a starter air valve in fluid communication with the air turbine starter to drive motoring of the gas turbine engine responsive to a regulated pressure from a compressed air source. A manual override of the starter air valve is adjustable to one or more predefined intermediate positions that partially open the starter air valve to limit a motoring speed of the gas turbine engine below a resonance speed of a starting spool of the gas turbine engine responsive to the regulated pressure.
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Citations
20 Claims
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1. A system for gas turbine engine motoring, the system comprising:
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an air turbine starter coupled to a gearbox of a gas turbine engine; a starter air valve in fluid communication with the air turbine starter to drive motoring of the gas turbine engine responsive to a regulated pressure from a compressed air source; and a manual override of the starter air valve, the manual override adjustable to one or more predefined intermediate positions that partially open the starter air valve to limit a motoring speed of the gas turbine engine below a resonance speed of a starting spool of the gas turbine engine responsive to the regulated pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system of an aircraft, the system comprising:
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a donor gas turbine engine operable as a compressed air source to cross bleed a regulated pressure; and a starting gas turbine engine comprising; an air turbine starter coupled to a gearbox; a starter air valve in fluid communication with the air turbine starter to drive motoring of the starting gas turbine engine responsive to the regulated pressure; and a manual override of the starter air valve, the manual override adjustable to one or more predefined intermediate positions that partially open the starter air valve to limit a motoring speed of the starting gas turbine engine below a resonance speed of a starting spool of the starting gas turbine engine responsive to the regulated pressure. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for gas turbine engine motoring, the method comprising:
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opening a flow path from a compressed air source to a starter air valve in fluid communication with an air turbine starter to drive motoring of a gas turbine engine; and controlling the compressed air source to provide a regulated pressure to the starter air valve set to a partially open position based on a manual override that is adjustable to one or more predefined intermediate positions that partially open the starter air valve to limit a motoring speed of the gas turbine engine below a resonance speed of a starting spool of the gas turbine engine responsive to the regulated pressure. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification