What was found
AFTER BLEEDS ON DURING CLIMB, A STRONG ACIDIC ODOR FILLED THE COCKPIT AND THEN SLOWLY GOT BETTER ENROUTE. BOTH COCKPIT CREW EXPERIENCED FEELING OF LIGHTHEADEDNESS, TINGLING LIPS & FINGERS, BY THE TIME WE STARTED OUR DESCENT, AFTER TOUCHDOM THE SAME STRONG SMELL RETURNED. PERFORMED LT ENG BLEED SYS BLANKING CAPS INSTALLATION TO BLEED DUCTS. BLEED SYS NR 10 M MEL 36-02 AUTH NR 030131DM-C LT BLEED VALVE SYS INOP IAW MEL 36-02 BLEED VALVE SECURED CLOSED BLANKING CAPS INSTALLED PERFORMED ENG'S RUN-UP IAW 72-00-00 NO SMELL NOTED. NRWC 282722 ASSIGNED TO CLEAR MEL 36-02 AUTH NR 030131DM-C (SEET TURNOVER.) FLUSHED AND CLEANED LT HEAT EXCHANGER (REMOVED AND RE-INSTALLED IAW JIC 21-51-51). PERFORMED AIR BLEED SYS OPT AND FOUND OK IAW JIC 36-11-00. ALSO PERFORMED AIR CONDITIONING OPT AND FOUND OK NO ODOR NOTED AT THIS TIME IAW JIC 21-10-00. MEL CLEANED. AML 288969 ACFT RELEASE FOR FCF PURPOSE, WHY, TO VERIFY OIL ODOR IN COCKPIT AFTER BLEEDS ON DURING TAKEOFF. FCF PASSED NO ODOR DETECTED.