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