The present work provides a method for maintenance cost estimation for a civil aircraft. The model evaluates maintenance costs at a subsystem level in order to quantify the effective impact of each aircraft part on the total maintenance cost. An analysis at the subsystem level can offer a more precise cost estimation because the most influential parameters (that is, the cost drivers) should be different for each aircraft part. Emphasis is given on the updating of a cost-estimating model proposed in 1966 that provided equations for the maintenance cost assessment at a subsystem level using the Air Transport Association nomenclature. The reference method is enhanced with additional cost items, and the choice of cost drivers is accurately considered. The application of the developed model shows good accordance with the reference values provided by the International Air Transport Association, and results are compared with the common state-of-the-art methods.

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