Weekly Check and Charging Batteries of a grounded Aircraft

Today I carried out a weekly check on a grounded aircraft.

Usually, normal aircrafts must undergo a weekly check that is due every seven calendar days.

Although this aircraft is grounded due to a structural damage that is being repaired, but this aircraft must also undergo weekly and daily checks also.

And this is also important to keep the batteries live and working.

As a normal weekly check item, I have checked the main batteries voltage and found it about 24 Volts.

This is still within normal operating limits but needs to be fully charged.


So I pushed in the two main batteries switches to operate the Battery Charge Limiter BCL of each one.

This enables them to be fully charged on board the aircraft during normal operation procedure.

At the beginning of the charging process there appears that the batteries are charged with relatively higher currents.

And then as the batteries voltages gets near the nominal 28 Voltages it gradually drops decreases.

And finally when it reaches 28 Voltages it means that the batteries are fully charged and no current is being drawn from them.

And then I put the batteries switches to the OFF position.

REF BSM