Originally Posted by
Winhern
What we're trying to say is that if the battery has enough deliverable charge to turn the engine over normally, then PROB99 the electrical system is going to be able to power the radios when they are switched on a few seconds later
I would suggest a more correct statement is that if the that if the battery has enough deliverable charge to turn the engine over normally, then PROB99 the
Battery is going to be able to power the radios when they are switched on a few seconds later. The ammeter must still be watched to see if the electrical system is charging and that may take an increase in RPM to get the alternator on line.
If the battery is not being charged then while it may initially power the radios obviously it will eventually lose enough power that it will no longer run the radios.
Note: For Generator equipped aircraft the gen fail light will be on below about 1100 or 1200 RPM so you generally will not be able to prove the charging system before the runup.