70 Questions
Which system provides a constant supply of filtered oil to various components of the engine?
Pressure system
When should the oil level be checked for the most accurate results?
15 to 20 minutes after shutdown
What is the normal oil level range in the tank?
ADD to MAX HOT
Which system is NOT a component of the oil system?
Ignition system
How often should the oil level be serviced after engine shutdown?
Within 30 minutes
What is the capacity of the oil system?
18.5 U.S. quarts
Which component of the engine is NOT supplied with oil by the oil system?
Fuel injectors
What is the correct method for checking the oil level in the tank?
Using the dipstick
What is the consequence of not servicing the engine oil level properly?
Engine damage
When should the oil level be checked for the most accurate results?
15-20 minutes after engine shutdown
Which warning light illuminates if the oil pressure drops to between 40 and 90 psi, for 10 seconds, above idle power?
Red OIL PX warning
If the oil pressure is less than 15 psi at idle power, what happens to the amber OIL PX caution?
It extinguishes
What does the SCU logic prevent during engine ground start?
Nuisance caution illumination
When does the amber OIL PX caution illuminate while maneuvering?
When oil pressure remains between 15 and 40 psi for 5 seconds or more
What does the illumination of both red and amber OIL PX caution/warning indicate?
SCU failure
What is the range of oil pressure that triggers the amber OIL PX caution at idle power?
15 to 40 psi
What is the range of oil pressure that triggers the red OIL PX warning above idle power?
40 to 90 psi
What does a momentary illumination of the amber OIL PX caution while maneuvering indicate?
Nuisance caution illumination
What happens to the amber OIL PX caution if the oil pressure remains between 15 and 40 psi at idle power for 5 seconds or more?
It illuminates
How is power provided for the oil pressure transducer?
Through a circuit
Which system incorporates two oil pickup elements to ensure oil pressure is maintained during inverted flight?
The pressure system
What is the purpose of the scavenging system in the oil system?
To return scavenged oil from the bearings and gearbox
Where is the oil cooler located in the aircraft?
In the lower aft cowl assembly
How is the oil tank vented in the aircraft?
Through a four-point breather system
Why may the engine oil pressure indicator display oil pressures up to 4 psi with the engine shut down?
Due to the design of the oil pressure transmitter
What happens if the main oil filter becomes clogged in the oil system?
Unfiltered oil continues to lubricate the engine
Where are the oil pressure and temperature sensed in the oil system?
Downstream of the main oil pump
What is the purpose of the signal conditioning unit (SCU) computer in the oil system?
To illuminate the warning on the engine indication and crew alerting system (EICAS)
At what oil pressure does the SCU activate the red OIL PX warning during idle power?
15 psi or below
What is the purpose of the engine data manager (EDM) in the oil system?
To pass oil pressure data to the SCU computer
Which warning light illuminates if the oil pressure is between 15 and 40 psi at idle power?
Amber OIL PX caution
What happens if the oil pressure drops to between 40 and 90 psi, for 10 seconds, above idle power?
Both amber and red OIL PX caution/warning illuminate
If the oil pressure is less than 15 psi at idle power, what happens to the amber OIL PX caution?
It extinguishes
What does a momentary illumination of the amber OIL PX caution while maneuvering indicate?
A normal oil pressure buildup
What does the illumination of both red and amber OIL PX caution/warning indicate?
An SCU failure
What is the purpose of the signal conditioning unit (SCU) computer in the oil system?
To prevent nuisance caution illumination
What is the range of oil pressure that triggers the red OIL PX warning above idle power?
40-90 psi
When should the oil level be checked for the most accurate results?
During engine shutdown
Where are the oil pressure and temperature sensed in the oil system?
Oil tank
How is power provided for the oil pressure transducer?
Through a circuit
Which two elements make up the pressure system in the oil system?
Two oil pickup elements and two dual-element gear-type pumps
What is the purpose of the scavenging system in the oil system?
To return scavenged oil from the bearings and gearbox
Where is the oil cooler located in the aircraft?
In the lower aft cowl assembly
How is the oil tank vented in the aircraft?
By a four-point breather system that includes a breather valve and centrifugal breather
What triggers the red OIL PX warning in the engine indication and crew alerting system (EICAS) above idle power?
Oil pressure dropping to 40 psi or below
What happens if the main oil filter becomes clogged in the oil system?
A filter bypass valve allows unfiltered oil to continue to lubricate the engine
Where are the oil pressure and temperature sensed in the oil system?
Downstream of the main oil pump
What is the purpose of the signal conditioning unit (SCU) computer in the oil system?
To contain the logic to illuminate the warning on the engine indication and crew alerting system (EICAS)
What is the purpose of the engine data manager (EDM) in the oil system?
To pass the oil pressure data to the signal conditioning unit (SCU) computer
What range of oil pressure triggers the amber OIL PX caution at idle power?
15 psi or below
Which component of the engine drives the propeller operating speed of 2000 RPM?
The reduction gearbox
What is the measure of the angle between the plane of rotation of the propeller and the chord line of the blade when the propeller blades are aligned nearly straight into the wind?
Feathered
At what throttle settings will the propeller blades be at low pitch?
Low speeds
What is the approximate angle of the propeller blade from the reference plane when it is in low pitch?
15°
What is the purpose of the engine power management unit (PMU) and the propeller interface unit (PIU)?
To control the propeller blade angle and propeller speed
What is the approximate torque produced by the reduction gearbox when the engine is producing 100% indicated torque at the prop shaft?
2750 foot-pounds
What is the approximate thrust produced at sea level, zero airspeed when the engine is producing 100% indicated torque?
2750 pounds
What is the purpose of the propeller system in the aircraft?
To maintain a constant speed of 2000 RPM
What is the range of oil pressure that triggers the red OIL PX warning above idle power?
Greater than 90 psi
What is the capacity of the oil system in the aircraft?
Not mentioned in the text
Which component is responsible for reducing the power turbine output shaft speed from over 30,000 RPM to the propeller operating speed of 2000 RPM?
The reduction gearbox (RGB)
What is the purpose of the chip detector in the reduction gearbox (RGB)?
To indicate oil contamination
What is the role of the propeller system in the aircraft?
To maintain a constant speed of 2000 RPM
What is the maximum torque available from the engine at sea level on a standard day?
2900 foot-pounds
Which component is responsible for automatically controlling the propeller blade angle and propeller speed?
The engine power management unit (PMU)
What is the purpose of the permanent magnet alternator (PMA) in the aircraft?
To generate electrical power
What is the role of the air conditioning compressor in the aircraft?
To provide air conditioning
How is the engine power output measured in the aircraft?
By the torque produced by the reduction gearbox
What is the purpose of the torque probe in the aircraft?
To control the propeller blade angle
What is the role of the power turbine in the aircraft engine?
To drive the reduction gearbox
Test your knowledge on the oil system of an aircraft engine with this quiz. Learn about the different components and their functions, as well as the importance of servicing the oil level within a specific timeframe.
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