Revised: 2/13/89
2I4
CHEROKEE ARROW III SERVICE MANUAL
ELECTRICAL SYSTEM
TABLE XI-IV. HYDROMETER READING AND BATTERY CHARGE PERCENT
Hydrometer Reading Percent of Charge
1280 100
1250 75
1220 50
1190 25
1160 Very little useful capacity
1130 or below discharged
11-69. BATTERY BOX CORROSION PREVENTION. The battery should be checked for spilled electrolyte
or corrosion at least each 50 hour inspection or at least every 30 days, whichever comes first. Should this be
found in the box, on the terminals or around the battery, the battery should be removed and both the box and
battery cleaned by the following procedure:
a. Remove the box drain cap from the underside of the fuselage and drain off any electrolyte that may
have overflowed into the box.
b. Clean the battery and the box. Corrosion effects may be neutralized by applying a solution of baking
soda and water mixed to a consistency of thin cream. The application of this mixture should be applied
until all bubbling action has ceased.
CAUTION
Do not allow soda solution to enter battery.
c. Rinse the battery and box with clean water and dry.
d. Place the cap over the battery box drain.
e. Reinstall the battery.
11-70. STA RTING THROUGH EXTERNAL POWER RECEPTACLE AND AIRPLANE’S BAT T E RY
NEARLY DEPLETED.
NOTE
Should the hydrometer reading indicate less than 1190, the battery should
be removed and recharged or replaced.
a. When using a 12-volt battery for external power starting and the airplane’s battery is nearly depleted,
the following procedure should be used:
1. Disconnect the airplane’s battery at the negative terminal to prevent excessive loading of the
external starting battery.
2. Check that all of the airplane’s electrical equipment is turned OFF.
3. Connect the external battery to the external power receptacle; turn master switch ON and start
engine using normal starting procedure.
4. Turn master switch OFF; remove external battery and then reconnect the battery at the negative
terminal.
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