260 time keeping mechanism 260 can be configured to provide time inputs and may be implemented within processor 255 the deploy condition may be implicitly determined or explicitly defined in software such as by setting of a flag embodiments of how the deploy condition is defined are now described in more detail the deploy condition could include that the altitude is lower than a first threshold in other embodiments a rate of descent is combined with a time measurement such as from the time inputs of time keeping mechanism 260 so the deploy condition could include that the altitude is lower than a second threshold plus the detected altitude has decreased by a certain amount over a certain time interval measured from at least one of the time inputs in some instances the deploy condition could include that the flaps are down at least in part as a safety precaution the various mentioned thresholds can be defined in terms of safety precautions to prevent the aircraft from landing with the landing gear retracted as such expected inputs can be pilot response times landing gear deployment times rates of descent and other considerations as will be obvious or evident to a person skilled in the art examples are now described fig3 is a diagram of sample altitude thresholds used to define the deploy condition according to embodiments the altitude thresholds are defined in terms of ground level 190 and while passenger aircraft 100 is descending descending is depicted in fig3 by descent arrow 171 there is shown the first the second a third and a fourth threshold 391 392 393 394 these altitude thresholds are not to scale rather fig3 shows sample locations for them relative to each other returning to fig2 components 200 may also include a seat.