What was found
DURING TAKEOFF FROM LANDING ZONE THE NR 1 SYS MGB OIL PRESS DROPPED TO .4 BAR, BELOW NORMAL RANGE. THERE WERE NO CHIPS DETECTED OR TEMP RISE ASSOCIATED WITH THIS INDICATION. SYS NR 2 PRESS REMAINED WITHIN NORMAL LIMITS. THE FLIGHT WAS ABORTED & CONTINUED TO THEIR BASE OF OPERATIONS, HELIPAD THAT WAS LESS THAT 1 NM AWAY. ACCOMPLISHED MIN POWER DESCENT & LANDING & EXECUTED NORMAL SHUTDOWN WITHOUT INCIDENT. POST FLIGHT INSPECTION DID NOT REVEAL ANY FLUID LOSS OR ABNORMALITIES EVIDENT ON THE PILOT POST FLIGHT. TROUBLE SHOT THE PROBLEM & FOUND THAT THE TRANSMISSION OIL PRESS TRANSMITTER WAS BAD & REPLACED IT. THE ACFT WAS THEN RETURNED TO SERVICE.