Piper Arrow IV Turbo Maintenance Manual page 228

STARTING THROUGH EXTERNAL POWER RECEPTACLE WITH AIRPLANE'S BATTERY
NEARLY DEPLETED.
Should the hydrometer reading indicate less than 1190, the
battery should be removed and recharged or replaced.
1. When using a 12-volt battery for external power starting and the airplane's battery is nearly depleted,
the following procedure should be used:
A. Disconnect the airplane's battery at the negative terminal to prevent excessive loading of the
external starting battery.
B. Check that all of the airplane's electrical equipment is turned OFF.
C. Connect the external battery to the external power receptacle; turn master switch ON and start
engine using normal starting procedure.
D. Turn master switch OFF; remove external battery, and then reconnect the battery at the negative
terminal.
E. Turn master switch ON and check ammeter for battery charging current.
2. When starting with a power cart and the airplane's battery is nearly depleted, the procedure in Step 1
need not be followed. The capacity of a power cart is sufficient to start an aircraft with a low battery. If a six
volt battery is available, it can be connected in series with the 12-volt external battery to supply 18-volts for
starting. In this case, use the same starting procedure as used with a power cart.
If aircraft battery is weak, charging current will be high. Do not
take off until charging current falls below 20 amps.
Never use a 12 or 24-volt battery in place of a six-volt battery
since electrical damage may result.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—NOTE—
—CAUTION—
—END—
1J12
24-41-01
Page 24-41
December 1, 1978