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NOTE
Several readings should be taken to confirm accuracy.
7.10.6. Electric Fuel Pump (Priming Pump) Operation
The DA20-C1 is equipped with a DUKES constant flow, vane type, two speed, and electric fuel pump. This pump emits an audible whine when it is switched on.
A. Fuel Prime
The pump's high speed setting is used for priming the engine prior to engine start. The prime setting is selected by turning the FUEL PRIME switch ON. An amber annunciator indicates that FUEL PRIME ON is selected.
B. Fuel Pump
The pump's low speed setting is required for maintaining positive fuel supply system pressures at low throttle settings. This setting is selected by turning the FUEL PUMP switch ON. This setting should be selected for any low throttle operations, including taxiing and any flight operations when engine speed may fall below 1000 RPM (e.g. stalls, spins, descents, landings, etc.). The FUEL PUMP may also be selected ON to suppress suspected vapour formation in the fuel supply system. Smooth engine operation at high ambient temperatures with heat soaked fuel and up to and exceeding the service ceiling has been demonstrated without use of the electric pump.
NOTE
Turning the priming pump on while the engine is running, will enriches the mixture considerably. Although the effect is less noticeable at high power settings when the fuel flow rate is high, the effect at low and idle throttle settings is an over rich mixture, which may cause rough engine operation or engine stoppage. It is therefore recommended that for normal operations, the FUEL PRIME be turned OFF.
7.11. ELECTRICAL SYSTEM
Simplified Schematic (see Figure 7.7)
7.11.1. Power Supply
A 12 V battery is connected to the master bus via the battery circuit breaker (50 Amps). The 40 amp. generator is attached to the engine near the propeller hub. The generator feeds the main bus via the generator circuit breaker (50 Amps). Both circuit breakers can be triggered manually. The generator warning light is activated by an internal voltage regulator monitoring circuit and illuminates when a generator fault occurs.
7.11.2. Ignition System
The engine is provided with two independent ignition systems. The two magnetos are independent from the power supply system, and are in operation as soon as the propeller is turning and the ignition switch is not off. This ensures safe engine operation even in case of an electrical power failure.
Figure 7.7. Simplified Schematic
WARNING
IF THE IGNITION KEY IS TURNED TO L, R OR BOTH, THE RESPECTIVE MAGNETO IS "HOT". IF THE PROPELLER IS MOVED DURING THIS TIME THE ENGINE MAY START AND CAUSE SERIOUS OR FATAL INJURY TO PERSONNEL. THE POSSIBILITY OF A ‘HOT’ MAGNETO MAY EXIST DUE TO A FAULTY SWITCH OR AIRCRAFT WIRING. USE EXTREME CARE AND RESPECT WHEN IN THE VICINITY OF A PROPELLER!
7.11.3. Electrical Powered Equipment
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