Analisis Viskositas Oli Pesawat King Air di Hanggar Politeknik Penerbangan Makassar

Abstract

One of the requirements that oil must have as a lubricant for aircraft is good viscosity at various aircraft engine operating temperatures. There are several factors that can reduce the oil viscosity value, such as overheating and the period of oil use. Based on the results of a review of AMLB records, it is known that this King Air aircraft has been ground run at intervals of 580 hours and the last ground run was in 2020. During this period the oil change on the King Air aircraft had not been carried out. According to the King Air pilots operating manual chapter servicing page 11-03 regarding the oil system, it is explained that you must replace the oil every 600 hours of use. From this it is known that the oil in the King Air aircraft engine has entered the recommended interval limit for oil changes and the oil in the aircraft engine has been sitting for a long time. Referring to this, it is necessary to analyze the quality of the oil in King Air aircraft, whether it is still suitable for use or whether it needs to be replaced. The method for testing oil viscosity characteristics in King Air aircraft engines in the laboratory uses the ASTM test method, namely viscosity at temperatures of 40ºC and 100ºC (ASTM D445) which refers to the MIL-PRF-23699 standard. From this viscosity value, the oil viscosity tolerance for each King Air aircraft engine can be determined and the actions that need to be taken refer to the P&W Canada Service Bulletin. The research results show that King Air aircraft engine oil can still be used within tolerance limits in accordance with the provisions of the P&W Canada Service Bulletin document which does not allow mixing oils with different viscosities. However, it is best to drain and replace engine oil according to AMM regulations, based on approval from P&W Canada with MIL-PRF-23699.