Originally Posted by SNS3Guppy
...On some turboprop engines, such as the PT6, the oil pressure is sampled at the same location as the torque indication.[post #5]
Originally Posted by SNS3Guppy
...Separate pickups deliver oil pressure to cockpit indications, from the torque indications... but they come from the same location in the engine...[post #8]
Both of the above statements are factually incorrect.
On the PT6A series of engines, engine oil pressure (displayed as "Oil Pressure" on the engine instruments) is measured by a sensor located on the aft part of the engine (the compressor section), and torque (displayed as "Torque" on the engine instruments) is measured by a sensor mounted on the reduction gearbox, which is at the forward end (the power section) of the engine.
The two sensors are approximately three feet apart and are entirely independent of each other - both mechanically and electrically.
The illustration below, published by Pratt & Whitney, illustrates the oil system in the 'small' PT6A engines (-6 to -34) and clearly shows the two different sensor systems, which I have highlighted in yellow.
SNS3Guppy, you are becoming awfully combative and bumptious in your posts - maybe you might want to tone it down a notch, OK? Most of us come here to gather and exchange information, not to participate in the text equivalent of a bar fight.
PT6A Engine Oil Principles
