What was found
ACFT DEPARTED, BUT PROMPTLY RETURNED. PILOT DISCREPANCY STATES; CLIMBING OUT OF 5000 FT, OUT EYES BEGAN TO BURN AND STING, AND A STRONG ODOR FILLED THE COCKPIT. PROBABLE CAUSE RELATES TO HYD LEAK ON RT MLG ASSY. PATHWAY FOR INGESTION INTO AIR CONDITIONING IS BEING EVALUATED.