Document No. 5-0324 Rev G
I. Ventilation Systems: Airplanes are often equipped with a battery ventilation
system. The ventilation system provides for removal of gasses and acid fumes from
the battery via vent tubes on the battery case. Ventilation systems are usually a
necessity when flooded type batteries are used, but the amount of gas and acid
fume generation is minimal from RG
®
Series batteries under normal conditions. In
some installations, the venting system is eliminated as part of the aircraft
modification when changing from a flooded battery to an RG
®
Series battery.
However, if the venting system is present, it should be connected when installing
RG
®
Series batteries.
CAUTION: NEVER INSTALL AN RG
®
SERIES BATTERY IN A SEALED OR
AIRTIGHT ENCLOSURE. COMBUSTIBLE GASSES ARE EMITTED DURING
CHARGE AND MUST BE PERMITTED TO ESCAPE.
J. Jump Starting: Never "jump start“ an aircraft that has a "dead” battery. A "dead"
battery, by definition, will not start an engine by itself and generally has an unknown
state of charge and state of health. A "dead" battery may appear to charge normally
but may require an extended charging time or a special charging method to return it
to an airworthy condition. In the event of an alternator or generator failure, the
battery may not be available to support the required emergency loads. To be on the
safe side, always remove a "dead" battery from the aircraft and perform a capacity
test to verify airworthiness.
K. Battery Rotation: When there are two batteries of the same model installed in an
aircraft and only one is used for APU or main engine starting, it is recommended that
the batteries be rotated when re-installed after servicing. This practice will allow for
equal wear and will prevent one battery wearing out faster than the other.
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