If it is determined that the swingfire heater is going to be used, the gooseneck step
section should be lowered to help contain heat applied by swingfire heater. If
swingfire heater is not going to be used, skip steps c, d, and e and proceed with
c. If swingfire heater is going to be used, lower and secure gooseneck step section (para. 2-13, step c).
d. If temperatures are between -25F to 50F (-31C to -46C), preheat APU crankcase (from underside of
gooseneck) using swingfire heater if available as follows: