What was found
ELECTRICAL BURNING ODOR SHORTLY AFTER TAKEOFF. LASTED THE DURATION OF THE FLIGHT AND INTENSIFIED DURING THE DESCENT. NO SMOKE PRESENT. (FLT 9923). AFTER REPLACEMENT OF THE LEFT SIDE ACM, PERFORMED OPERATIONAL CHECK OF THE AIR CONDITIONING SYSTEM WITH THE APU BLEED AIR, NO BURNING ODOR DETECTED. PERFORMED OPS CHKD THE AIR CON SYS WITH LT ENG BLEED AIR ONLY, NO BURNING ODOR DETECTED. PERFORMED OPS CHK OF AIR CON SYS WITH RT ENG BLEED AIR ONLY, NO BURNING ODOR DETECTED. PERFORMED OPS CHK OF AIR CON SYS WITH BOTH ENGS BLEED AIR , NO BURNING ODOR DETECTED. WORKED IAW 21-51-00.