APU COLD WEATHER STARTING (CONT)
b. Prime jet start by pulling jet start valve (1) knob full out with petcock (2) closed. If knob does not remain out,
check that petcock (2) is fully closed; then, pull knob again.
c. Have second person perform paragraph 2-16a, steps (7) thru (9), to start APU.
d. When APU starts to crank over, turn jet start petcock (2) counterclockwise to open. Pump jet start valve (1) three
times to prime APU. A few additional pumps may be necessary before engine runs smoothly.
e. Once engine is running smoothly, turn jet start petcock (2) clockwise to close. Secure step section in its normal
2-52 Change 1