control lever to idle cut-off and engage the starter by rotating the
magneto switch clockwise. When the engine fires, release the
magneto switch, advance the mixture and retard the throttle.
(d) Starting Engine With External Power Source*
An optional external power receptacle allows the operator to
use an external battery to crank the engine without having to gain
access to the airplane’s battery.
Turn the master switch OFF and turn all electrical equipment
OFF. Connect the RED lead of the external power cable to the
POSITIVE (+) terminal of an external 12-volt battery and the
BLACK lead to the NEGATIVE (-) terminal. Insert the plug of the
jumper cable into the socket located on the fuselage. Note that when
the plug is inserted, the electrical system is ON. Proceed with the
normal starting technique.
After the engine has started, reduce power to the lowest possible
RPM, to reduce sparking, and disconnect the jumper cable from the
aircraft. Turn the master switch ON and check the alternator
ammeter for an indication of output. DO NOT ATTEMPT
FLIGHT IF THERE IS NO INDICATION OF ALTERNATOR
OUTPUT.
NOTE
For all normal operations using the external
power cables, the master switch should be
OFF, but it is possible to use the ship’s battery
in parallel by turning the master switch ON.
This will give longer cranking capabilities, but
will not increase the amperage.
CAUTION
A dead or depleted aircraft battery should not
be charged in the aircraft.
*Optional
PIPER AIRCRAFT CORPORATION SECTION 4
PA-38-112, TOMAHAWK NORMAL PROCEDURES
ISSUED: JANUARY 20, 1978 REPORT: 2126
REVISED: MARCH 1, 1979 4-15
control lever to idle cut-off and engage the starter by rotating the
magneto switch clockwise. When the engine fires, release the
magneto switch, advance the mixture and retard the throttle.
(d) Starting Engine With External Power Source*
An optional external power receptacle allows the operator to
use an external battery to crank the engine without having to gain
access to the airplane’s battery.
Turn the master switch OFF and turn all electrical equipment
OFF. Connect the RED lead of the external power cable to the
POSITIVE (+) terminal of an external 12-volt battery and the
BLACK lead to the NEGATIVE (-) terminal. Insert the plug of the
jumper cable into the socket located on the fuselage. Note that when
the plug is inserted, the electrical system is ON. Proceed with the
normal starting technique.
After the engine has started, reduce power to the lowest possible
RPM, to reduce sparking, and disconnect the jumper cable from the
aircraft. Turn the master switch ON and check the alternator
ammeter for an indication of output. DO NOT ATTEMPT
FLIGHT IF THERE IS NO INDICATION OF ALTERNATOR
OUTPUT.
NOTE
For all normal operations using the external
power cables, the master switch should be
OFF, but it is possible to use the ship’s battery
in parallel by turning the master switch ON.
This will give longer cranking capabilities, but
will not increase the amperage.
CAUTION
A dead or depleted aircraft battery should not
be charged in the aircraft.
*Optional
PIPER AIRCRAFT CORPORATION SECTION 4
PA-38-112, TOMAHAWK NORMAL PROCEDURES
ISSUED: JANUARY 20, 1978 REPORT: 2126
REVISED: MARCH 1, 1979 4-15
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