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REGULATIONS Section 3034 Ground Testing Engines A. WARM-UP (Cont'd) 16. Cont'd (Gr-1820 G-102 only) Return left engine tank selector to a tank containing fuel. Both engine fuel pressures should return to normal and warning lights should go out. Turn left engine tank selector valve to each individual tank containing gasoline in the manner described for right engine tank selecotr. Then return selector to "Left Main Tank". Turn crossfeed off. Fuel pressure on right engine should drop off and warning light should come on. Return right engine tank selector to "Rain Main Tank" fuel pressure should return to normal on right engine and warning light should go off. This sequence insures positive method of checking operation of entire system from tanks to engines and in either direction through crossfeed system. 17. (DC-3 Airplanes G-102 only) Both pitot heaters shall be turned ON and operated for several seconds to allow ammeter reading to stabilize. (Current to both pitot heaters is controlled by one switch.) A current draw of 7 1/2 to 8 amperes by individual pitot heaters, should be obtained when pitot ammeter selector switch is placed in "upper" and "lower" position. (DC-3 Canadair Conversion 1830-92 Engines) Both pitot heaters shall be turned "ON" and operated for several seconds to allow ammeter reading to stabilize. (Current to pitot heaters is controlled by individual switches, one for each heater.) A current draw of approximately 4 amperes by individual pitot heaters should be obtained when pitot ammeter selector switch is placed in "upper or "lower" position. B. INTERMEDIATE RPM CHECK [[2 Columned Table]] |GR-1820G-102|R-1830-92| 1.| If oil temp. has increased 10°F. since starting, it will be satisfactory to advance the throttles as required for the following checks. | If oil temp. has increased to 104°F. and the heads have reached 250°F. it will be satisfactory to advance the throttles as required for following checks. In any case, the oil pressure gauge should be watched during engine warm up for fluctuatuions caused by air trapped in the lines. Any air so trapped should be allowed to escape by extending the warm-up period until pressure stabilizes. 2. | Advance throttles to obtain 1300 RPM. | Advance throttles to obtain 1500 RPM. 1/15/46 DC-3 GROUND OPERATION Page 9