Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Patent
1986-03-31
1987-05-05
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
60233, 364427, F02C 600, F02C 900
Patent
active
046621717
ABSTRACT:
A system for automatically restoring thrust to the working engine(s) of an aircraft if power is lost by an engine while the aircraft is operating at reduced thrust during a takeoff noise abatement maneuver is disclosed. The automatic thrust restoration (ATR) system is activated when: (1) the automatic throttle (A/T) system of the aircraft is engaged; (2) the throttle hold mode of operation of the A/T (which occurs during the initial takeoff period) has ended; and, (3) engine thrust is reduced below a preset value (which indicates that the aircraft is making a noise abatement maneuver). When these three conditions exist, the ATR system is activated for a period of time adequate for the aircraft to climb at a reduced slope to a prescribed altitude (e.g., 1500 feet). During the period of time the ATR system is activated, engine thrust is monitored. If thrust from an engine is lost, the ATR system automatically increases the throttle setting and, thus, the thrust of the working engine(s). ATR system reliability is enhanced by embodying the ATR control functions in two forms--a software form and a hardware form. Reliability is further enhanced by continuously testing the ATR system during takeoff, up to an altitude below that at which engine thrust noise abatement reduction occurs (e.g., 500 feet). Test failure results in the ATR system being rendered inoperable.
REFERENCES:
patent: 3987279 (1976-10-01), Borelan et al.
patent: 4019702 (1977-04-01), Annin
patent: 4034938 (1977-07-01), Borelan et al.
patent: 4546353 (1985-10-01), Stockton
Jackson Douglas O.
Virnig Daniel R.
Casaregola Louis J.
The Boeing Company
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