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

Page: 432 / 1956

PAGE 16
Feb 28/07
2I10
24-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
E. Charging - (Gill Model G-243)
CAUTION: WEAR EYE PROTECTION WHEN CHARGING A BATTERY - DO NOT TAKE
CHANCES. MAKE SURE THE CHARGING AREA IS WELL VENTILATED. IF
CENTRAL AIR CONDITIONING IS USED, THE BATTERY CHARGING AREA
SHOULD BE VENTED TO THE OUTSIDE AIR TO PREVENT HYDROGEN GASSES
FROM BEING CIRCULATED THROUGHOUT THE BUILDING.
The National Electric Code forbids charging batteries installed in aircraft or within 10 feet of fuel
tank areas. The battery must be removed from the aircraft for charging. Further, an aircraft battery
should not be allowed to deteriorate to the point where safety of flight is jeopardized. The batteries
emergency capacity should be sufficient to power the essential bus for a minimum of thirty minutes.
(1) Remove cell plugs and ensure that vents in plugs are open and that vent valves operate freely.
(2) Check that the electrolyte level in each cell is at the bottom of the split ring.
(3) A hydrometer check of each cell should be accomplished. (See Hydrometer Reading and
Battery Charge, below.)
(4) It is recommended that vent caps be left on the battery while charging. In addition a wet cloth
should be placed over the vent caps within the manifold.
(5) The battery may be charged at any rate, in amperes, not to exceed that point which would
produce bubbling and gassing of the electrolyte or a cell temperature of 115° F in any case.
NOTE: If a cell temperature reaches the 115° F. limit, the charging rate shall be reduced and
the charge completed at 3 amperes or less. DO NOT CHARGE AT A HIGHER RATE
WHEN CELLS ARE GASSING. Refer to Gill Service Manual G.S.M.-682 for alternate
charging methods and service procedures.
Electrolyte Temperature
°C °F Correction
60 140 1.024
55 130 1.020
49 120 1.016 Add To
43 110 .012 Reading
38 100 .008
33 90 .004
---------27----------------80 ------------------------.000 -------------------------
23 70 -.004
15 60 -.008
10 50 -.012
5 40 -.016 Subtract
-2 30 -.020 From
-7 20 -.024 Reading
-13 10 -.028
-18 0 -.032
-23 -10 -.036
-28 -20 -.040
-35 -30- -.044
CHART 3
SPECIFIC GRAVITY TEMPERATURE CORRECTION