What was found
DEPARTED THE BASE EN ROUTE TO PICK UP A PATIENT. ABOUT 5 MIN INTO THE FLIGHT STARTED TO SMELL A FAINT SMELL OF BURNT RUBBER, CONTINUED FOR ABOUT 2 MINUTES & THE SMELL BECAME A STRONG SMELL OF BURNT RUBBER. OPENED THE SLIDING WINDOWS TO VENT THE COCKPIT & LANDED BACK AT BASE WITHOUT FURTHER INCIDENT. AFTER INSPECTING ACFT & APPLYING ELEC POWER, DETERMINED THE SMELL WAS ASSOCIATED WITH THE LANDING LIGHT. THERE IS PROSEAL HOLDING THE PLASTIC WINDOW FOR THE LANDING LIGHT & THE LIGHT WAS SHINING ON THE PROSEAL, HEATING IT UP SIGNIFICANTLY & CAUSING A FOUL ODOR. THERE IS A GOOD DEGREE OF DIFFICULTY GETTING THE LIGHT BULB TO SHINE OUT THE CTR OF THE PLASTIC WINDOW. THE LIGHT REALIGNED, WE DID A ELEC POWER ON CHECK & A 10 MINUTE HOVER CHECK WITH THE LANDING LIGHT ON & THERE WERE NO FURTHER FOUL ODORS DETECTED.