Which of the following components are considered critical in safeguarding an aircraft oil system?

• Navigation lights and communication antennas

• Oil tank, oil pump, oil cooler, and oil filter

• Landing gear and wing flaps

1. Why is it important to have bearings in a jet turbine engine?

• 1. To balance the weight and loads from the shafts

• 1. To reduce friction and maintain alignments of shafts

• 1. To make the engine run in a cooler temperature

Which of the following statements accurately describe the oil tank in a gas turbine engine lubrication system?

• The oil tank can be a separate unit or part of an external gearbox called the sump

• The oil tank does not have provisions for filling or draining the system

• The oil tank is a component of the engine's combustion chamber

What is the primary function of an oil pressure transmitter in an aircraft?

• To regulate the flow of oil through the system

• To cool down the oil temperature before it reaches critical components

• To measure and transmit the oil pressure to the cockpit instruments

1. What determines the number of bearings required to support the main rotor of a turbine engine?

• 1. The length and weight of the shaft

• 1. The weight and the thickness of the shaft

• 1. The length and shape of the shaft

1. What loads are supported by a typical ball bearing?

• 1. Radial load

• 1. Axial load

• 1. Both radial and axial load

What is the main purpose of magnetic chip detectors in a lubrication system?

• To filter out large debris from the oil

• To measure the viscosity of the oil

• To detect and collect metallic particles in the oil

1. A single angular ball contact bearing can support

• 1. Radial load and axial load from both sides

• Radial load and a one-directional axial load

• 1. Radial load and a one-directional dynamic load

Answer explanation

Which types of pumps are commonly used in recirculatory oil systems?

• Axial-flow pumps and peristaltic pumps

• Centrifugal pumps and piston pumps

• Gear-type pumps and Gerotor-type pumps

Thrust ball bearing carries

• 1. Both radial and axial loads and are normally housed in a bearing chamber

• 1. Radial loads only and are normally used in conjunction with a roller bearing or radial ball bearing

• 1. Axial loads only and are normally used in conjunction with a roller bearing or radial ball bearing