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9. Fault finding (Unscheduled maintenance)
The table below identifies the tests and inspections to diagnose a fault condition as a result of an unscheduled removal
of the battery from aircraft.
Problem
Zero volt at battery connector
Zero volt cell
Minus volt cell
Reduced discharge performance
Immediately breakdown of discharge
voltage
Cell top of charge voltage of <1.56V
Low insulation resistance
Visible signs of serious thermal damages
of battery component
Thermostat does not switch
Damaged or distorted battery case / lid
parts of stainless steel
Electrolyte density too low
False Temperature indication
The document reference is online, please check the correspondence between the online documentation and the printed version.
Possible Reason
Intercell links broken,
Main connector damage,
Short circuit
Cell installed and operated in reverse
Low compression of the cells within the battery
Increased internal resistance due to low torque
connection of upper pole nuts
Cell installed in reverse
Corroded nuts, links, washers, and main
connector parts
Low capacity cells due cell's imbalance
Low capacity cells (irreversibly aged)
Cells dried out
Damaged main connector
Faulty cell
Loose pole nuts, broken spring washers
Main connector defect
Cells, heavily dried out
Battery deep discharged
Separator system inside cell defect
Any leakage of electrolyte, or conductive liquids
and moisture
Leakage caused by cell short circuit
Leakage due to defective vents
Leakage due to damaged cell cases
Leakage due to faulty adjustment of electrolyte
level
Short circuits, dried out cells, defective
temperature control
Defective thermostat
Mechanical impact, transportation damage
Repeated cell's leakages
Defective switch assembly
Loose upper pole nuts
36
Check Refer
Corrective action
to Task
10.1
Task 10.2
Task 10.9
Task 10.5
10.1
Task 10.7
Task 10.9
10.1
Task 10.7
Task 10.9
10.1
Task 10.8
Task 10.9
10.1
Task 10.2
Task 10.9
10.1
Task 10.7
Task10.9
10.1
Task10.2
Task 10.5
Task 10.3
Task 10.9
10.1
Task 8.1
Task 10.9
10.1
Task 10.7
Task 10.9
10.1
Task 10.7
Task 10.9
10.1
Task 10.5
Task 10.9
10.1
Task 10.7
Task 10.9
10.1
Task 10.2
Task 10.9
10.1
Task 10.5
10.1
Task 10.7
Task 10.9
10.1
Task 10.9
10.1
Task 10.7
Task 10.9
8.3
Task 8.4
Task 10.3
Task 8.5
Task 10.9
Task 8.6
8.3
Task 8.6
Task 10.9
Task 10.7
8.3
Task 8.4
Task 8.6,
Task 8.5
Task 10.9,
8.3
Task 8.6
Task 10.9
Task10.7
8.3
Task 8.4
Task 10.9
Task 8.6
10.1
Replace battery,
8.7
Task 10.4
Task 10.9
10.1
Task 10.6
Task 10.9
8.4
Task 10.7
Task 10.9
8.7
10.1
Task 10.4
Task 10.9
10.1
Task 10.2
Task 10.9
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