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46. Exhaust gases from the cylinders pass through riser assemblies to a muffler and tailpipe.
The muffler is in a shroud which forms a heating chamber for cabin heat.
47. Ram air for engine cooling enters the front of the cowling, is directed through and around
the cylinders and oil cooler by baffles, and is exhausted through the cowl flaps on the lower aft
edge of the cowling.
48. The flow of cooling air can be controlled by cowl flaps mechanically operated by the
Cowl Flap Lever on the right side of the centre control pedestal. The lever is raised to open the
cowl flaps for takeoff and high power operations and lowered to close the cowl flaps for cruise
and descent. Intermediate positions can be used to maintain optimum engine operating
temperatures. The lever must be moved to the right to clear detents before being moved.
Figure 1-31 Cowl Flaps Control
The IO520D is a high displacement / high power engine that can be
prone to cylinder damage associated with frequent shock cooling.
Careful management of CHT is critical to ensuring engine longevity.
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