What was found
WHEN EN ROUTE BACK FROM LANDER TO THE HOSPITAL IN CASPER WITH THE PATIENT, TRANSMISSION PSI GAUGE BEGAN TO FLUCTUATE STARTING AT AROUND 10 PSI WORKING ITS WAY UP TO 20 PSI OF FLUCTUATIONS. CLOSE TO CAPER ABOUT 2 MILES TO THE WEST, DECIDED TO MAKE OUR WAY BACK TO AIRPORT WITH AIRCRAFT AND TRANSPORT THE PATIENT BY GROUND. FOLLOWED AMC PROCEDURE FOR A MX EVENT. INSPECTED TRANSMISSION PRESSURE SYSTEM. SUSPECTED MOISTURE MAY HAVE ENTERED THE CONNECTOR PLUG AND CAUSED AN INTERMITTENT PRESSURE FLUCTUATION DURING FLIGHT. CLEANED AND INSPECTED THE TRANSDUCER AND CONNECTOR PLUG. COULD NOT REPRODUCE THE PROBLEM ON THE GROUND RUN OR MAINTENANCE OPS CHECK FLIGHT. AIRCRAFT WAS RETURNED TO SERVICE.