Setiawan, F., Y. Purwantiningsih, and D. Wicaksono. “Schedule Planning and Maintenance Activities Auxiliary Power Unit (APU) Boeing 737-500 Aircraft With Reliability Method”. Prosiding Seminar Nasional Sains Teknologi Dan Inovasi Indonesia (SENASTINDO), Vol. 3, Dec. 2021, pp. 91 -02, doi:10.54706/senastindo.v3.2021.130.