Can I confirm the RAT will extend automatically on a RR T700 powered A330 if:
AC BUS 1+2.......OFF AND ENG 1+2 N2....<50%
Also if:
ENG 1+2 N3.......<50%
Anyone know N1,N2 and N3 windmill speeds at say 300kts?
Rgds SMOC
404 Titan
29th Dec 2004, 06:40
EMERGENCY GENERATION AFTER LOSS OF ALL MAIN GENERATORS
If both buses, AC 1 and 2, are lost and if both engines are lost, the Ram Air Turbine (RAT) extends automatically.
• If the green hydraulic system is powered by the ram air turbine, the emergency generator
supplies:
— the AC ESS BUS,
— and the DC ESS BUS through the ESS TR.
All LAND RECOVERY AC and DC BUS bars are shed. They are recovered when the LAND
RECOVERY pushbutton is ON.
The AC ESS GND is lost.
As for the windmilling speeds of N1,2 & 3, I’m sorry I cann’t find any reference to it. As you are probably aware and I am sure you are alluding to the optimum relight speed is 300kts/M.82.