hopefully this pic works. The PT6 is equipped with inertial separators, on most a/c these are selectable either by Bowden Cable or electric actuators. these are used in icing conditions and most ground situations to avoid FOD/Ice ingestion. The actual engine inlet is annular, but is normally fed by a bottom pitot or ramp inlent. Further to the CS prop control, engine oil pressure is boosted from around 100 psi to about 750 psi and enters the prop hub thru an gland system into a single acting hub. With loss of oil pressure a spring will drive the blades to a feather position. The normal failure mode for the PT6 is due to a leak in the P3 line of of the prop governor to the FCU, the engine then falls back to min flow around 55%. good for electrics and bleed air but essentially produces no power. Thankfully the AFX system will normally feather the affected side. Several days back we had an low speed reject, due to a lose fuel line. the Captain shutdown after clearing the runway.