(5) While holding decompression valve handle (3) open (up), second person must turn APU START switch (5) to
START position and hold. As APU cranks over, slowly lower decompression valve handle (3). Once APU is
at normal cranking speed, release decompression valve handle (3). Turn jet start petcock counterclockwise
to open and pump jet start valve three times to prime APU. A few additional pumps may be necessary for the
APU to run smoothly. Second person must hold APU start switch to START position until engine is running
smoothly; then, return it to OFF.
(6) If APU starts, proceed to step o below. If APU does not start, repeat steps (1) thru (5) above. If APU fails to
start after three attempts, notify unit maintenance.
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