SECTION 9
EMERGENCY - ELECTRICAL SYSTEM

 
ONE-GENERATOR FAILURE

 
1. Generator switch - Check on.
2. Generator field relay circuit breaker - Reset - One reset only should be made.
3. Generator switch - Reset.  If warning light does not go out, proceed as follows:
4. Generator switch - OFF.
5. Switch off all unnecessary services.
6. Secindary bus reset switch - As desired.

           Note.  The secondary bus is automatically deenergized when one generator fails.  Action (6) is carried
           out only if certain services from the secondary bus are necessary for the flight.  These services are
           windshield heat controls and inverters, main inverter, rear utility receptacles, windshield wipers, wing
           and tail deicing, pitot heat, cabin and heating, aileron trim control and indicator, and main inverter relay.
 

7. Ammeter - Check for overload. Do not allow ammeter loading for operating generator to exceed 300 amps.

 
TWO-GENERATOR FAILURE

 
1. Generator switches - check on.
2. Generator field relay circuit breaker - Reset - Only one reset should be made.
3. Generator switches - Reset.  If warning lights do not go out, proceed as follows:
4. Emergency bus switch - Emergency.
5. Battery master switch - OFF.
            Note. Emergency bus is now energized from the battery.

           CAUTION:With the emergency bus in operation and battery master switch off, propeller feathering
           pumps and fuel booster pumps are inoperative.
 

6. Switch off any unnecessary services to conserve the battery.

 
AMMETER FAILURE

            If the ammeter for either generator registers zero but other electrical indications are normal, check for a
            faulty ammeter gaga as follows:
 

1. Generator switch for appropriate generator - OFF.
2. Ammeter - Check for increased reading on ammeter for the other generator.
3. Generator switch - Reselect ON if reading increases. An increased reading will indicate that both generators are operating and that the fault is in the ammeter circuit.

 
 MAIN INVERTER FAILURE

 
1. Inverter circuit breakers - Reset.
2. D.C. power circuit breakers - Reset.
3. Inverter switch - Select OFF then return to main.
4. If standby light remains out - Leave switch at main.
5. If standby light comes on - Select switch to STBY.

 
STANDBY INVERTER FAILURE

 
1. Inverter circuit breakers - Reset.
2. D.C. power circuit breakers - Reset.
3. Inverter switch - Select OFF then main.
4. If the A.C. failure light comes ON - Select inverter switch OFF.

26 VOLT A.C. TRANSFORMER FAILURE

              If the 26 VAC warning light comes on while either inverter is operating properly, select the instrument
             transformer switch from main to standby.

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