GPWS autopilot monitor

Details GPWS autopilot monitor GPWS autopilot monitor

1995-04-24

1996-12-17

Swann, Glen

Communications: electrical

Aircraft alarm or indicating systems

Flight alarm

340963, G08B 2100

Patent

active

055857914

ABSTRACT:
A warning system for aircraft equipped with an autopilot system having a radio altitude hold (R/A HOLD) function and/or a barometric altitude hold (ALTITUDE HOLD) function monitors the R/A HOLD and ALTITUDE HOLD function control switches, as well as the touch-controlled steering (TCS) control to determine when the functions have been engaged. When either of the R/A HOLD or ALTITUDE HOLD function control switches are selected while the autopilot system is engaged, the system samples the radio altitude or barometric altitude at the moment that the R/A HOLD or ALTITUDE HOLD functions are selected and stores the sample as a reference or datum. The system then compares the current radio altitude or barometric altitude with the datum. Should the actual radio altitude or barometric altitude exceed the datum by a predetermined amount, a warning is generated. In order to prevent spurious warnings, the system is disabled when the touch-control steering is active.

REFERENCES:
patent: 4189777 (1980-02-01), Kuntman
patent: 5260702 (1993-11-01), Thompson

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