Document No. 5-0324 Rev G
SERVICING
A. Charging Battery While Installed: Batteries may be charged while installed on the
aircraft with the following restrictions:
• Battery charger provides a constant potential (CP) output that meets the
requirements specified in the CMM.
• The battery compartment is well ventilated.
As an extra precaution, the battery should be disconnected from the aircraft
electrical system if there is any possibility the charging source may put out excessive
voltage that could damage equipment connected to the battery bus.
B. Scheduled Inspections: If the battery is used to satisfy essential or emergency
power requirements, its capacity must be tested periodically to assure airworthiness.
In general, a battery is considered airworthy if it has at least 80% of rated capacity.
Concorde and the FAA recommend 85% as the pass/fail criteria to provide a margin
of safety. The battery should be removed from the aircraft to perform a capacity
test. Refer to the applicable CMM for detailed instructions regarding frequency of
inspections and capacity test procedures.
C. Unscheduled Inspections: The battery should be subjected to a capacity test
under any of the following conditions:
• Abnormally slow engine starting,
• Abnormally high charging current (greater than 5% of C1 capacity) after
several hours of charging, or
• Battery becomes excessively hot (case temperature above 55°C/131°F).
D. Repairs: The cells and other internal components of most RG
®
Series batteries
are non-repairable. The battery assembly must be replaced when internal
components fail or wear out. If external repairs are needed to the battery assembly
(i.e., missing labels, dents, scratches, etc.) contact Concorde for assistance.
NOTE: SOME RG
®
SERIES BATTERIES HAVE REPLACEABLE
SUBASSEMBLIES, AND THE CMM FOR THESE BATTERIES INCLUDE AN
ILLUSTRATED PARTS LIST FOR THE REPLACEABLE COMPONENTS.
E. Temperature Sensors: Some battery models are equipped with externally
mounted temperature sensors. Instructions for inspection and testing of Concorde
temperature sensors are contained in separate maintenance manual supplements
for each type of temperature sensor. These maintenance manual supplements are
available on Concorde’s website (see front page of this manual). If internet access is
not available, contact Concorde for assistance.
G. Servicing Parallel Batteries: In some aircraft, two identical batteries are used in
parallel for starting engines. The recommended practice is to replace both batteries
even if only one has low capacity. The replacement batteries should be of the same
or similar age and usage history. When batteries of different age are used in
parallel, the newer battery will work harder due to lower resistance, which
accelerates aging of the newer battery.
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