Specifications

MARATHONNORCO AEROSPACE, INC.
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00
Page 105
APR 15/06
1.3 Inspection - Received in for Service
When a battery is received in the shop for routine servicing, the following inspections should be
performed:
Visually inspect can and cover for dents, damage, epoxy coating separation, vent tube obstruction,
latch function and cover seal condition.
Any evidence of discrepancies, in above shall be cause for replacement of the parts.
Remove the battery cover and inspect for the following:
Clean top of cells and connectors with a nylon brush. Blow out residue with oil-free compressed air
using standard safety precautions. If cells are exceptionally dirty, connecting links, hardware, and
cells may need to be removed, washed in warm water and dried. If this is required, discharge the
battery before disassembly.
Verify that the polarity of the cells and position of the internal connections are correct.
Inspect intercell connectors for corrosion, burns or discoloration. Clean with an eraser or replace
as required.
Remove vent plugs and inspect “O” rings and vent sleeves for damage or hardening. Replace if
defective. If necessary, wash vent plugs in warm water to remove the white powder (potassium
carbonate) from vent holes. Dry with oil-free compressed air using standard safety precautions.
1.3.1 Inspection of Battery Power Connector
Inspect for corrosion or pitting on the contact pins.
Inspect for arcing or burn marks on the contact pins. This is caused when the disconnect is
removed under electrical load.
Inspect for battery electrolyte leakage through the receptacle body and/or the contact pins.
NOTE: Electrolyte leakage can be noticed by a discoloration of the receptacle body with
the glass fibers exposed.
Gauge each contact pin diameter using dial calipers that are capable of reading to .001 inch.
The diameter shall be .375
± .005 inches.
1.3.2 Inspection of Sensor Receptacle (if so equipped)
Examine sensor connector for pin or locking mechanism damage.
CAUTION: The electrolyte used in the battery is a caustic solution of Potassium Hydroxide. Avoid
contact with any part of the body.