Oil pressure and Temp Flashcards
What is the purpose of oil pressure indication in an aircraft engine?
To monitor the oil supply system and prevent engine failure due to inadequate lubrication and cooling of engine components
What does the oil pressure indicator typically display?
The engine oil pump discharge pressure.
What materials are commonly used to make Bourdon tubes?
Metals such as copper, brass, aluminum, or nickel alloys like monel.
What are the two main types of oil pressure transmitters?
The Bourdon Tube type and the Strain Gauge type.
How does a Bourdon tube type oil pressure transmitter work?
It uses a c-shaped or helical tube that changes shape under pressure, causing displacement that deflects an indicator needle or is converted into an electrical signal.
What is the Wheatstone bridge configuration in strain gauge type sensors?
A circuit with four resistive arms where the strain gauge is one arm, and changes in strain cause voltage differences that indicate pressure.
How does a strain gauge type pressure sensor work?
It measures mechanical strain by detecting changes in electrical resistance when the object deforms under pressure.
What does the oil temperature indicator measure?
The temperature of the oil as it enters the oil pressure pump, which is vital for lubrication and cooling.
What is the function of a low oil pressure switch in an engine?
It initiates a low oil pressure warning by closing a circuit when oil pressure falls below a set limit, triggering a visual and audible alert.
What happens when the Wheatstone bridge in a strain gauge becomes unbalanced?
A voltage difference occurs, proportional to the strain experienced, which is then amplified and processed for indication.
How does an RTD or Thermocouple sensor work in measuring oil temperature?
They detect changes in electrical resistance or voltage in response to temperature changes, which are processed and displayed.
What are the common types of oil temperature sensors used in aircraft engines?
Resistance Temperature Detectors (RTD) and Thermocouples.
What role does the Wheatstone bridge circuit play in oil temperature sensing?
It amplifies and processes the weak signal from the temperature sensor to provide accurate temperature readings.
How is oil temperature represented and monitored in aircraft?
In degrees Celsius or Fahrenheit, with warnings triggered if the temperature exceeds safe limits.
What happens if the oil temperature exceeds safe operating limits?
An over-temperature warning is triggered, alerting the flight crew with visual and audible signals.
