DUCT MUFFLER MOS 177.97 08-OCT-1999 HRSAiSC REF: BTC 49-172-00-01 AFL APH 10000 3378:18 77 10000 M 6544:42 49-180-00 OPERATIONAL CHECK APU MUFFLER ASSEMBLY OF THE DRAIN FITTING ON THE EXHAUST DUCT MUFFLER + 49-220-00 49.450 MOS 177.97 08-OCT-1999 FIRS/ MSC REF: BTC 49-180-00-01 AFL APH 5000 3378:18