What was found
ENGINE 1 TEMP. INDICATION GOES OFF AND ON DURING FLIGHT. A TEST FLIGHT EVALUATION REVEALED WHEN AT A HOVER, NUMBER 1 ENG OIL TEMP WAS AT 92 AND DURING CRUISE FLIGHT BACK TO AIRFIELD TEMP DROPPED BACK DOWN TO 88 AND REMAINED. WHEN HOVERING BACK TO PARKING, OIL TEMP STARTED INCREASING AND WAS AT 120 WHEN SHUTTING AIRCRAFT DOWN. AFTER SHUTDOWN OIL TEMP DROPPED TO APPROXIMATELY 110 FOR A COUPLE OF MINUTES THEN STARTED INCREASING AGAIN TO GREATER THAN 140 AFTER WHICH THE INDICATION WENT AWAY AND OIL TEMP WAS DISPLAYED IN YELLOW. REMOVED AND REPLACED #1 OIL TEMP SENSOR IAW ARRIEL 1E2 79-37-00-900-801-A01.