SusiAir PILATUS PORTER PC6, Maintenance Program

Page: 243 / 248

Form No. ASI/MD-90 Revision 3 – July 2020 Page 3 of 8
NO. DESCRIPTION MECH. ENG.
3 Is the Measured Voltage Greater than 25.55 VDC? YES / NO

Circle One
If Yes Proceed to Perform Capacity Test. (Step 4).
If Measured Voltage is between
25.55 and 20.00 VDC Charge Battery Using
CONSTANT POTENTIAL METHOD. (Step 5) YES / NO

Circle One
If Measured Voltage is less than 20.00 VDC Charge Battery using CONSTANT
CURRENT METHOD. (Step 6)
YES / NO

Circle One
4 CAPACITY CHECK TEST. (OFF WING)
Note: To ensure accurate battery capacity readings when the battery is removed
from the aircraft allow the battery to stabilize at 23 Degree C +/- 5.
The Capacity Test accurately determines the continued serviceability of the battery
and its ability to retain charge.
Ensure that the battery has been fully charged and allow it to stand with no further
charging or discharging activity for at least the minimum required time period as
outlined in Figure 103. (4 Hours or 18 hours as appropriate).
Set the electronic load to zero amperes. After the required standing time verify the
ambient temperature is at 23 Degree C +/- 5.
Connect up the battery to the Test Set Up shown in figure 101, Discharge
Equipment Test Set Up.
Load the battery to 40 amperes using the electronic in a CONSTANT CURRENT
MODE. Simultaneously begin timing the discharge cycle using a stop watch or
another clock.
Allow the battery to discharge until the measured terminal voltage drops to 18
VDC, then terminate the discharge test.
Record the amount of time. ______________ Minutes.
If equal or greater than 54 Minutes then Remaining capacity if greater than 90
Percent, Next inspection due in Six months / 1500 Hrs
4 CAPACITY CHECK TEST. (OFF WING))
If greater than 48 Minutes but less than 54 Minutes Remaining Capacity is
between 90 and 81 Percent. Next inspection due in three months
If 48 Minutes or less Reject the Battery it has failed the Capacity test.