A power-saving electronic device for use with a computer motherboard in a \u201csuspend to memory\u201d state is disclosed. The altitude can be referenced to a runway for landing operations. Consequently, a video recording device records a code-multiplexed video signal on a recording medium. A bush has an annular sleeve with an inner face engaging the pivot pin and an outer face engaging a bore wall of the first part. According to the inventive method, error messages increment a counter and an alarm is triggered when a predetermined position on the counter is reached.