APU JUMP START (CONT)
Hearing protection is required within 10 feet (3m) of the APU when the APU is
running or injury to personnel may result.
h. Turn APU control box START switch (7) clockwise momentarily to see if starter will crank.
(1) If starter cranks, immediately rotate START switch (7) to OFF position and perform steps (8) thru (10) of
(2) If starter does not crank, rotate START switch (7) to OFF position and check jumper cables for proper
(3) After checking connections, repeat steps f thru h.
i. After APU starts, disconnect negative (black) clamp on cable (3) from tractor frame, and disconnect positive (red)
clamp on cable (2) from tractor batteries. Close battery box on tractor. Coil cables (2 and 3) and stow in stowage
bag (1). Tighten drawstring on stowage bag (1).
ARCTIC WEATHER APU STARTING
The following procedure is a timed sequence of events necessary to start the APU
in arctic weather conditions. Read this procedure and strictly adhere to the steps
or starting may be harder because of lose of time and exposure to cold
APU arctic starting is accomplished in two methods. The first method of starting,
without using swingfire heater, can be accomplished from 0F to 25F (-18C to
-31C). The second starting method can be accomplished from 25F to 50C
(-31C to 46C). The use of the swingfire heater, if available, is addressed in this
a. Perform steps b thru f of paragraph 2-30 to connect APU jump start system.
b. At rear of gooseneck, gain access to APU (para. 2-13, step c) and prepare APU for arctic starting as follows:
The hydraulic tank oil valve must be open prior to starting the APU or severe
damage to the hydraulic pup will result.
(1) Open hydraulic tank oil valve handle (1), in line with valve body.
(2) Check that fuel petcock (2) is in open position, handle in line with filter body.