What was found
DURING PERFORMANCE OF A 2400 HOUR INSPECTION THE ABSOLUTE PRESSURE SWITCH FOR THE AURAL WARNING ON THE PRESSURIZATION SYSTEM, FAILED FUNCTION CHECK. THE UNIT IS TOO CLOSE THE SWITCH AND PROVIDE AURAL WARNING TO THE FLIGHT CREW AT 8,750 FEET + OR - 250 FT. THE SWITCH THEN OPENS DURING DESCENT PRIOR TO 7200 FEET. THE TEST ON THIS UNIT RESULTED IN THE SWITCH CLOSING AT 9,250 FT. THE POSITION WHEN THE SWITCH REOPENED WAS AT 8,400 FEET. THIS IS NOT A NORMAL STATUS REPLACEMENT TRACKED ITEM, THEREFORE REPLACEMENT DATE AND TIME WERE NOT CONFIRMED. REPLACEMENT WAS AFTER 4-9-01 AS THAT IS THE MANUFACTURED DATE OF THE SWITCH.