STARTING MAIN ENGINE IN COLD WEATHER (continued)
With brakes still locked, set throttle to run engine at 1200 rpm and shift transmission to fourth gear position. When
engine coolant temperature gage indicates 120°F to 140°F, shift into neutral and idle engine. (If transmission
temperature approaches 300°F during warm-up, immediately shift to neutral until temperature approaches normal
10. During warm-up, refer to instrument panel checkout procedure (p. 2-88).
STARTING THE APU IN EXTREMELY COLD WEATHER
To avoid damaging radio components, turn OFF all electrical and radio switches before starting
Before you start the APU in extremely cold weather (0° to -65°F; -17.80C to -53.90C), refer to Appendix
E to check:
Engine crankcase oil grade and level
Chaincase oil grade and level
Hydraulic oil grade and level
Change oil as necessary (see Appendix E).
When temperature is below -25°F (-31.7°C) outside, preheat APU compartment (p. 2-219) prior to
starting the APU.
Starting When Temperature is 00° to -25°F (-17.8°C to -31.7°C)
To avoid excessive demand on batteries, do not crank engine longer than 1 minute at a time. Do
not attempt to start the APU for longer than 5 minutes total. If the APU does not start in 5 minutes,
notify Unit maintenance.