A ground proximity warning system including a pitch angle alerting device, the
pitch angle alerting device including warning logic having an input that is structured
to receive a signal that is representative of the indicated pitch angle of the
aircraft, the warning logic being structured to determine a difference between
a pitch angle signal received on the input and a predetermined threshold, the warning
logic being structured also to output a signal representative of the difference
between the two signals; and an advisory indication generator coupled to accept
the output of the warning logic, the advisory indication generator being structured
to generate an advisory indication signal as a function of the difference between
the two signals.