Which type of starter is included in the approved oil grades for the CRJ900?

The correct answer identifies the Air Turbine Starter as the type included in the approved oil grades for the CRJ900. The Air Turbine Starter is a key component in the aircraft's engine starting system, utilizing compressed air to initiate engine operation. This starter is designed to function efficiently at various environmental conditions, especially with the specific oil grades that are approved for use in the CRJ900.

The compatibility of oil grades with the Air Turbine Starter ensures reliable performance and longevity of the starter motor, critical for safe and efficient engine start-up sequences. Proper lubrication and operational functionality of the Air Turbine Starter are essential for optimal engine performance and reliability during flight operations. This information highlights the importance of the Air Turbine Starter in the aircraft's overall systems and maintenance procedures.