Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Patent
1987-05-14
1989-01-03
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
F02C 928
Patent
active
047947551
ABSTRACT:
A back-up control system is implemented in a single engine aircraft to provide the inactivation of a faulty primary system and engagement of a secondary system, and thereby provide a means of maintaining controllable flight sustaining thrust. The aircraft's hydromechanical main engine control and its companion pressure and temperature sensors can develop faults which can result in the inability of the engine to deliver flight sustaining thrust. The electronic control contains logic functions which indicate failure of the main engine control when all of the following exists for a minimum of three seconds: (a) the power lever is at a position requesting a level of dry thrust which exceeds a predetermned threshold; (b) core engine speed is below that required to deliver the predetermined level of dry thrust; (c) core engine speed is not increasing; and (d) turbine temperature is beneath the maximum allowable limit. The back-up system is used in conjunction with a three position cockpit switch having "normal", "on" and "standby" positions. In the "normal" position the back-up system is off and must be manually activated by switching to the "on" position. In the "standby" position, the back-up system is automaticlly activated when the necessary conditions occur.
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Hutto, Jr. Walter D.
Stockton William W.
Auton William G.
Casaregola Louis J.
Singer Donald J.
The United States of America as represented by the Secretary of
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