Abstract :
The Boeing 737-900 ER aircraft experienced problems with the oil tank, oil
scavange, oil fuel-heat exchanger and lubrication unit, from the results of the
examination of several factors causing the problem, it was found damage to the
Engine oil component. As a result of this damage causes wear, and the moving
components cannot cool the components that rub against each other. The amount
of oil contained in the oil tank is always reduced so that there is an unnatural
addition of oil. In the period of 1 year 2018 to 2019, 185 times Engine oil
component failures were found.
This analysis uses the Fault Tree Analysis method. This method is used to
identify the risks that contribute to the occurrence of failure. Using the Buttom-up
Method which is deductive in nature, starting with the assumption of failure or
loss from the (Top Event), then detailing the causes of a top event to the (Root
Cause), then evaluating it with a minimum cut set ( MCS).
The results of the analysis using the Fault Tree Analysis method with Engine
oil fail as the top event obtained 4 intermediate events, 14 basic events and 29
causes of failure, and the components that most often cause Engine oil damage
are seals, oil tank filter caps, scavange filters, and bearings.