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Section 3039    GROUND CHECK PRIOR TO TAKE_OFF

B. POSITION OF CONTROLS (cont'd)

GR-1820G--102   R-1830-92

2. Fuel valves left engine "Left Main" right engine, "Right Main" crossfeed valve "OFF"    Fuel valves left engine "Left Main" right engine "Right Main'

3. Mixture control "Full Rich".    Mixture control "Auto Rich"

4. Set and uncage directional gyro, and check artificial horizon for uncaged and indicating level.

5. No cowl flaps.    Cowl flap control should be placed in trail just prior to take-off.

6. Co-pilot should be ready to operate wobble pump in case of engine fuel pump failure during take-off.    Electric fuel booster pumps "ON".

7. Move elevator. rudder, and ailerons through full travel being sure they are free and clear.

8. It is the Captain's responsibility to operate tail wheel lock when airplane is aligned with runway in position for take-off.

C. TEMPERATURE LIMITATIONS

1. Oil temperature limits at start of take-off.

Minimum - 100°F. Maximum - 167°F.    Minimum - 100°F. Maximum 167° F.

Observe head temperature closely as head temperatures are a guide to detonation danger, although not always an instantaneous or reliable one since detonation may be occurring because of bad distribution in one or two cylinders and not in the rest, or in one having a thermocouple. As a rule, however, detonation will not occur on take-off no matter how high the manifold pressure, if head temperatures are not over 350 degrees F. before starting take-off. (400° F. with R-1830-92 Engines.)

If, however, only a small amount of cooling air is flowing thru the engine as during a long running up period on the ground, especially if turned sideways to the wind, head temperatures rise rapidly and there is a tendency for certain parts of the head to get very hot and be in a condition for causing detonation when take-off is begun.  1/15/46-DC-3 GROUND OPERATION