DC System / Battery Integrity Check

    The following procedure checks the DC system and the batteries.  It is not a check that you do before each flight.  It is more of a first flight of the day or "Somebody else has been flying my airplane" check.
 
 

 
Action
Correct Result
1
    Battery Switch - EMERGENCY
   TR Switch - ESS DC		    Batteries Power ESS DC Bus
   Bat Amp Gauges Indicate Dischsarge 
2
    Battery Switch - OFF    Batteries Still Power ESS DC Bus
   Both Bat Amp Gauges Indicate Discharge
3
    TR Switch - OFF    No Power on Aircraft
4
    Battery Switch - EMERGENCY    Bat Amp Gauges Indicate Discharge
   L & R DC Feeder Lights - ON
   Main DC Bus Light - ON
5
    Both Generator Switches - EMERGENCY    L & R DC Feeder Lights - OUT
   Main DC Bus Light - OUT
6
    One Main Fuel Boost Pump - ON
   # 1 Bat Disconnect Switch - PRESS		    Minimum 22 Volts
   # 1 Bat Disconnect Light - ON
   # 2 Bat Shows Discharge
   # 1 Bat Shows Zero Amps
7
    # 2 Bat Disconnect Switch - PRESS    No Power on the Airplane
8
    Battery Switch  - ON    No Power on the Airplane
9
    Emergency Generator Switches - Normal    No Power on the Airplane
10
    # 1 Bat Disconnect Switch - PRESS    Minimum 22 Volts
   # 1 Bat Amp Gauge shows Discharge
   # 2 Bat Amp Gauge shows Zero
11
    # 2 Bat Disconnect Switch - PRESS    # 2 Bat Disconnect Light - OUT
   Slight increase in DC Volts
   Both Bat Amp Gauges show Discharge
12
    Fuel Boost Pump - As appropriate.    Crew survives this check.

    The next logical action would be to start the APU and proceed with your planned flight.  If no flight is pending, perform the shutdown checklist.


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