Installation & Operation Manual
O-360 and IO-360 Series Engines
© March 2004 Superior Air Parts Inc. Chapter 6 • Normal Operating Procedures
7
Table 6-6 • Rotorcraft – Pre-Takeoff Ground Check
1. Warm-up as stated above in Table 6-4
2. Mixture control "Full Rich", check oil pressure and oil temperature.
3. Magneto Check
Raise collective pitch control to obtain 15 inches of manifold pressure
and 2,000 RPM.
Switch from both magnetos to one and observe drop-off, switch back
to both until the engine regains its speed and then switch to the other
magneto and note drop-off. At no time should this drop-off exceed
175 RPM.
Difference between the drop-offs of the two magnetos should never
exceed 50 RPM. If a smooth drop-off past normal is observed it is
usually a sign that the mixture is either too lean or too rich.
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