Hello all.
Your flying a 757 ER plane. The EICAS illuminates a MAIN BAT CHARGER message.
Nothing listed in the QRH.
You fly another hour or so land and alert maintenance. They come out change the charger and the battery. You proceed on your way.
From our systems book it states that the main battery charger charges the main battery and then the HOT BAT BUS.
The HOT BAT BUS has the following items on it.
• Alternate landing gear extension motor
• APU fuel shutoff valve
• Clock time base, Captain and F/O
• Emergency wing escape slides
• Equipment cooling ground warning and automatic test
• Evacuation signal system
• Fire extinguisher bottles
• Ground fueling system
• Inertial Reference System (IRS) emergency power
• Parking brake valve
• RAT manual deployment system
• Wing spar fuel shutoff valves
Its obvious that none of the items on the HOT BAT BUS are being used continuously until you operate a system, except for the clocks.
Can anyone tell me if you were on your way across the atlantic, would you want to divert?
How long until the main battery completely fails.
Would it fail?
If the battery fails you lose the HOT BAT BUS also.
What are the implications of this such as the American Airlines Flight dealt with going into Chicago a few years ago. (They "inadvertently" discharged their battery with a rather unpleasant outcome).
Any information on this would be helpful