What was found
DURING NR 3 ENGINE START, ENGINE ROLLED BACK AND SHUT ITSELF DOWN. N2 WAS AT 51 PERCENT AT THE TIME, 2ND START WAS NORMAL. INSPECTED INTAKE AND EXHAUST; NO OBVIOUS DEFECTS. SERV FUEL CONTROL BURNER PRESS BELLOWS PER P&W JT8D M/M 73-21-01. DURING ENGINE START FOUND NR 3 N2 INDICATOR SLOW TO RESPOND. REMOVED AND REPLACED NR 3 N2 INDICATOR PER BMM 77-12-0. RAN ENGINE SEVERAL TIMES PER DHL JRH CHAPTER 5. NO DEFECTS NOTED.