Thanks for the info you posted.
One more question, when and Where is the throttle placed during starts on these types?
You are correct about the 407 Capt. LH
On shutdown, If you turn off boost pump pressure before NG reaches "0", the fuel metering piston in the HMU may not seat in the proper place. You WILL get a "start degrade" light on your next power-up, and will be required to go through a piston-parking procedure. It's simple, but a bit embarassing in front of customers and coworkers.
It's always good to sit in the pilots seat and monitor all parameters as the engine winds down anyway, right?
The 407 FADEC logic will handle most overtemp situations, and will automatically abort fuel-flow, while continuing to motor the engine.
We have had some hot and high start problems, the main contributing factors being:
-very high, 9,000 to 10,000 + AND OAT above 15C
-excessive residual MGT (TOT) mainly from a very short time after shut-down.
-Poor battery condition (24V min to start)
-a downwind condition.
With experience, all factors can be managed. ie, if you're working that high, plan on idling if the shutdown period may be short, or if shutting down at altitude, take a 30 minute break, always park into wind, keep a fresh battery installed...
Last edited by 407 Driver; 12th Nov 2003 at 10:04.