THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Effective: 05/05/04
2-31
and terminal connections with a wire brush and coat with petroleum jelly to minimize
corrosion.
** CAUTION **
Do not allow the bicarbonate of soda to enter
the battery filler openings, as it will neutralize
the electrolyte, which could permanently
damage the batteries.
A hydrometer test of the battery’s solution should be made each 50 hours of operation, or
more often in hot weather. If the specific gravity tests 1.240, the battery should be
removed and recharged. The solution levels should be examined and, when necessary,
add distilled water to maintain the level of 3/16 inch over the separators. If distilled water
is added, do it just prior to recharging so that the added water mixes with the solution.
When the recharging is completed, the specific gravity should be between 1.275 and
1.300.
The battery should be checked for grounding to the case. A voltmeter can be used to
check between the positive cell and the case. A ground fault exists if there is a reading
on the voltmeter. A dated service record shall be attached or stamped on the terminal
side of the battery to indicate that the battery has been capacity tested. Refer to Section
10 for recharging procedures.
