18 Questions
What does each line of the FF on an Engine Performance Trend graph represent?
100lb of fuel flow per hour
Why is effective trend monitoring crucial in engine maintenance?
To detect small deviations in instrument indications
What might cause a deviation in one engine indication only?
Instrument malfunction
Why was the engine with this graph reading removed?
For excessive oil consumption
What was the result of the bleed air leak into the No.4 and No.5 main bearings?
Increased oil consumption
What could be a consequence of a deviation of two or more parameters?
Change in engine performance
Why did the engine require more fuel to produce the required thrust due to the bleed air leak?
To counteract the increased compressor RPM
How were engine parameters affected when the No.4 and No.5 main bearings leaked bleed air?
From high to unacceptable range
How can a minor fluctuation in the engine data be interpreted?
As a normal occurrence within engine operating limits
What would deviations in engine parameters indicate for an engine with normal oil consumption according to this graph?
Bleed air loss
In modern aircraft, what monitors and records aircraft and engine condition and faults?
Microcomputer systems
What receives signals from sensing devices and processes them in a central unit in modern aircraft?
Central microcomputer
What is the purpose of an engine vibration indicator?
To measure and display engine vibration levels
Why may aircrew not notice a change in engine vibration due to an impending failure?
The normal vibration level of a turbojet engine is low
What is engine trend monitoring based on?
The consistency with which an engine follows its performance figures
Why are many engines fitted with vibration systems?
To continually monitor engine vibration levels
What does an engine pickup do in the engine vibration system?
Positions itself at critical areas on the engine
What is the purpose of a cockpit indicator in the engine vibration system?
To display engine vibration levels to aircrew
Learn about the importance of accurate observations of engine instruments for effective trend monitoring in aircraft engines.
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