- Does the airplane indeed behave differently than this simulator did (engines windmilled without an increase in N2 after the APU came online)
Well, my two cents worth...
Yes, the airplane is the airplane and the box is just that! The 270kts on the GE's are a recommendation from the engine manufacturer and these are never hard numbers. In real life will it restart at 265 kts CAS on a cold day with high QNH??? Probably yes, you need sufficcient airflow and N2 RPM to get the show going. Does GE guarantee it below 270KCAS? No. The box is programmed to not start if you are below the recommended speed, but again this is a simulator! And there seems to be a bit of confusion here regarding APU/Autostart. Autostart is a function of the EEC, has NOTHING to do with the APU. In the Dual Eng Fail/Stall NNC the APU is started as a backup (remember it starts without you touching anything if both XFER busses are unpowered...) in case the engines do not relight at least you are getting AC and Bleed Air (below 22,000) from it, so the HEAT PITOT L+C+R will disappear in due time and at least you are not manually controlling the aircraft. The APU is there for AC not for APU assisted start.
- Why does the checklist omit the possibility to use the starter? (maybe because the subsequent ENG FAIL L/R does?...
)
Again, I haven't seen this for a while, but my understanding is, that Boeing has developed this NNC with the possibilities in mind. If you go through 3000 AGL and both engines quit? Well, look for the softest spot... You don't have time for anything. At 10,000 with high terrain under... Well, again, you would need to be very unlucky. Now if they fail at FL370, you have substantial amount of time for a relight with windmill. If they do not start and you find yourself below 22,000 with APU running, yes, by all means do it from memory, -OR- use the In-Flight Start NNC as the ENG FAIL L,R will not be available, since you've cycled the Fuel Control switches from RUN-CUTOFF-RUN during the Memo items. This action will remove the ENG FAIL L,R.
What I think...