What was found
WHILE LEVEL AT 10000 AND INDICATING 310KIAS A LOUD BANG AND WIND NOISE OCCURRED, APPARENTLY FROM THE NOSE AREA. SPEED WAS REDUCED TO 200KIAS AND NOISE SUBSIDED. ALL HANDLING CHARACTERISTICS WERE NORMAL. FLOOR AREA SEEMED TO BE VIBRATING ASSOCIATED WITH WIND NOISE. PERFORMED A VISUAL INSPECTION OF THE AIRCRAFT NOSE SECTION INCLUDING THE NOSE LANDING GEAR DOORS NO DISCREPANCIES NOTED. REMOVED THE ACM WATER SEPARATOR CONDENSER FOUND VERY DIRTY. REPLACED WITH A NEW CONDENSER OPERATIONAL CHECK LEAK CHECK SATISFACTORY, PERFORMED IAW MM CHAP 21-10-95. PERFORMED ENGINE POWER RUNS, OPERATED THE AIRCRAFT ENVIRONMENTAL SYSTEM, CHECKED ALL BLEED AIR DUCT OUTLET VENTS FOR OPERATION. PERFORMED THE LT AND RT ENGINE SURGE BLE