With the engine running at 1800 RPM, switch from both magnetos to only one and note the RPM loss, switch to the other magneto and again note the RPM loss. Drop off on either magneto should not exceed 125 RPM.

Check both the oil temperature and pressure. The tem- perature may be low for some time if the engine is being run for the first time of the day, but as long as the pressure is within limits the engine is ready for take-off.

Carburetor heat should also be checked prior to take-off to be sure that the control is operating properly, and to clear any ice which may have formed during taxiing.