Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 433 / 1956

PAGE 17
Feb 28/07 2I11
24-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(6) If a constant current (recommended) charge is available, the charge should be started at 3
amperes and reduced in half if and when cells start gassing until fully charged.
(7) As charging occurs, if any cells sputter or flood, the electrolyte level is too high and the excess
must be removed. In any case the electrolyte level shall be adjusted at the end of the charge.
The level will rise due to acid returning to the electrolyte mix, normal gassing, and expansion
due to temperature rise.
(8) Thoroughly clean battery after charging to prevent remaining acid bridges which can form
during charging.
NOTE: Never allow lead acid batteries or tools used on them to be near Ni-Cad batteries and
Ni-Cad battery tools.
F. Hydrometer Reading and Battery Charge
Whenever checking the battery, ascertain that all connections are clean and tight and that the fluid
level is above the baffle plates. If it is necessary to add fluid, fill cell with distilled water to the bottom
of the split ring. After adding water, charge the battery until gassing before taking a hydrometer
reading. Otherwise, the water and electrolyte will not be mixed, giving a false reading. Temperatures
different from the established norm will effect the hydrometer readings. Refer to Chart 3 for the
temperature corrections. Specific gravity values for a fully charged battery are shown in Chart 4.
To adjust low specific gravity, charge the battery (see Charging, above) until it is gassing and until
the specific gravity rises no higher over a 3-hour period. Then remove some electrolyte and replace
with 1.300 specific gravity electrolyte. Repeat this step if, after one hour of charging, the specific
gravity is still too low. DO NOT ADJUST A CELL THAT DOES NOT GAS.
CAUTION: IN THE OPERATION OF THE BATTERY, GASES ARE FORMED WHICH MAY BE
EXPLOSIVE IF IGNITED. NEVER CREATE SPARKS OF ANY KIND OR BRING AN
OPEN FLAME NEAR THE BATTERY. VENTILATE THE BATTERY WHEN CHARGING
TO DISPOSE OF THE GAS GENERATED BY THE BATTERY.
To adjust high specific gravity, charge the battery (see Charging Battery) until it is gassing and until
the specific gravity rises no higher over a 3-hour period. Remove some electrolyte and replace with
distilled water. Repeat this step if, after one hour of charging, the specific gravity is still too high.
Electrolyte Temperature Specific Gravity
47° F 1.280 to 1.300
77° F 1.280 to 1.290
107° F 1.260 to 1.280
Temperature change of 30° F changes the reading 0.010.
CHART 4
ELECTROLYTE TEMPERATURE CORRECTIONS