Abstract: A system installed in an aircraft automatically retrieves and displays approach minimum data to the pilot, thereby relieving him or her of the burden of searching for the desired information. The display of the data may take the form of a complete or partial image of a published approach chart. In a variation, the system may both automatically retrieve and automatically enter the desired data into the flight plan, thereby relieving the pilot of both the searching and data-entry tasks. The system may include a database, a screen, a control, and a controller.

Abstract: Method and apparatus for metering polyphase power sources in which cycles for each phase are sampled at each degree and converted to a binary representation of amplitude. Sampling commences with a zero cross-over and a first digital conversion provides range data for developing scaling factors which are retained in memory and for providing a selective gain for amplifying. The scaling factor and the range data then are multipled to develop a digital representation of the sample amplitude which may have as many as 21 significant bits plus a sign bit. These expanded data valuations for current and voltage then are selectively multiplied for each degree sampled to develop data available for generation of 12 electrical parameter outputs. Generally, six of these outputs will be elected by the user. Volt amperes are computed with respect to the zero cross-over events for both voltage and current samples, while quantities such as Q and var are developed by selective delayed multiplication of the unit degree samples.