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are between the bearings and the accessory drive gears - this is useful because wear and tear would not show up in a reciprocating engine due to multiple metal-on-metal contact points.What is meant by 'critical flows' needed by a turbine engine to operate properly?An air metering framework has been developed utilizing a variety of critical stream venturis. By stopping critical venturis, the aggregate metering region is changed to give a wind current range from 25 lb for each sec to 1200 lb for every sec. A special stream control valve and air fixing segment gives low air speed bending at the passageway to the meter.Also, describe the term “feathering” as it pertains to propeller function and why it’s important to be aware of this during an aviation safety investigation.Feathering is a reference to the alignment of the propeller blades in a way that the pressure difference between the front and back of the propeller is almost equal; thus, providing 0 thrust force or drag.ReferencesWood, R. H., Sweginnis, R. W., & Lederer, J. (2006). Aircraft accident investigation(Second ed.). Casper, WY: Endeavor Books. Retrieved from bYuMAJCoiNAjn1tilN02Y9cEBoE0cOSByrNE2kCdRKVfn_OOmiPdRybCwlqePYiR1_