Using normal battery start procedures, the second engine can be started as soon as the loadmeter is in the green (roughly 20-40 seconds). Using external power, the second engine can be started immediately after the first starter drops out (49% Ng). Using the Quick Start procedure, the second engine can be started after the starting engine Ng reaches 25%, even on a battery start. The only delay for any start is waiting for ENG & XMSN T's and P's. In our GoM environment, the temps are in the green very soon after the starter drops out. Colder climate operations would obviously have to wait longer. NOTE: No shortcuts here...These procedures are straight from the RFM.
As soon as the battery switches are turned on, all avionics are powered-up. There is a RAD MASTER switch that disables some of the avionics to aid in a battery start (RAD MASTER OFF). We use a GPU for nearly every start...RAD MASTER ON...and all avionics are powered-up as soon as the External Power is applied and battery switches are on.
Last edited by patniven; 12th Mar 2008 at 16:55.
Reason: Note