Aircraft non-normalized angle-of-attack indicating system

Details Aircraft non-normalized angle-of-attack indicating system Aircraft non-normalized angle-of-attack indicating system

1998-12-11

2000-10-10

Zanelli, Michael J.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Aeronautical vehicle

701 14, 340974, G01C 2100

Patent

active

061310557

ABSTRACT:
The present invention is directed to a non-normalized aircraft angle-of-attack indicating system. An angle-of-attack vane produces a signal .alpha.' indicative of raw aircraft angle-of-attack. A pitot-static system (68) produces output signals representative of aircraft static pressure and total pressure, P.sub.s and P.sub.t, respectively. The signals .alpha.', P.sub.s and P.sub.t are fed to an air data computer (66) which correspondingly produces an aircraft actual angle-of-attack value .alpha. and a calculated Mach number, M. Configuration sensors (80) produce output signals representative of gear position, g, flap position, f, and speed brake position, sb. The signals .alpha., M, g, f and sb are fed to a display computer (76). The display computer includes a submodule (90) which utilizes a lookup table to determine a value of angle-of-attack stick shaker, .alpha..sub.ss from the values of M, g, f and sb. A second submodule (92) utilizes a lookup table to produce a second angle-of-attack reference value .alpha..sub.ref from the values g, f and sb. The display computer (76) feeds the .alpha., .alpha..sub.ss, .alpha..sub.ref signals to an angle-of-attack indicator which includes a pointer (102) which is moveable with respect to a fixed gauge (104). The .alpha. signal is used to drive the pointer (102) to indicate the aircraft's actual angle-of-attack. Bug drivers are utilized to position the first bug .alpha..sub.ss and the second bug, .alpha..sub.ref, at their appropriate positions on the opposite side of the gauge.

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