Autofeather state maintenance

Details Autofeather state maintenance Autofeather state maintenance

1987-06-01

1989-07-04

Lall, Parshotam S.

Boots, shoes, and leggings

360 5, 371 12, 36455101, G06F 1574

Patent

active

048456179

ABSTRACT:
Each engine of a multi-engine aircraft is monitored to determine if it has become inoperative during a critical flight mode such as takeoff or landing. If so, the propeller of the inoperative engine is feathered and the remaining engine or engines is uptrimmed. A "state machine" indicative of the various states of the aircraft is established and the present state of the aircraft is stored in a non-volatile memory; if an electrical power interruption occurs during a critical flight mode the identity of the present operating state may be quickly recalled for immediate refeathering of an inoperative engine and reuptrimming of the remaining engine or engines.

REFERENCES:
patent: 4298959 (1981-11-01), Sundermeyer et al.
patent: 4409670 (1983-10-01), Herndon et al.
patent: 4587655 (1986-05-01), Hirao et al.
patent: 4621335 (1986-11-01), Bluish et al.
patent: 4646241 (1987-02-01), Ratchford et al.
patent: 4682292 (1987-07-01), Bue et al.
patent: 4729102 (1988-03-01), Miller, Jr. et al.

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