Tdscanuck From Canada, joined Jan 2006, 12710 posts, RR: 81
Reply 1, posted (6 years 2 days 12 hours ago) and read 3551 times:
Quoting HAWK21M (Thread starter): Presumingly there is a heavy tailwind prevailing at the time & the engine is windmilling but in the opposite direction.Will N1 or N2 register on the gauges?
If the EEC is off, probably not. Most FADEC engines don't report anything to the airplane unless the EEC is powered. If you've got the EEC on but aren't running a start, I'm not sure. Some RR engines have a threshold below which they won't show the spool rotation to prevent nuisances...this might cover up wind-driven windmilling, regardless of direction.
But the RB211-535 is not a FADEC engine!
This engine has steel cable throttle controls, a separate bleed valve controller, and an EEC. The EEC is in the aircraft fwd equip bay, and acts mainly as a overlimit controller, reducing the fuel flow to avoid exceedances.