Flybyguy From United States of America, joined Jun 2004, 1812 posts, RR: 1 Posted (11 years 7 months 1 week 12 hours ago) and read 5617 times:
In light of Kcrwflyer's question on commuter startup/shutdown procedure,
I have noticed that ATRs seem to allow the engines to be started before the props start spinning. I've noticed this on a few American Eagle flights in the Caribbean. For about 30 seconds before the props start spinning a high pitched jet-like sound would occur, then the prop would begin spinning.
Is it just me or does this actually happen?
"Are you a pretender... or a thoroughbred?!" - Professor Matt Miller
ArmitageShanks From Costa Rica, joined Dec 2003, 3836 posts, RR: 14
Reply 1, posted (11 years 7 months 1 week 12 hours ago) and read 5545 times:
Yes, it does happen. Many turboprobs have special gears to allow them to run without the prop spinning so they can provide power for the aircraft at the gate. I think they call it Hotel Mode" or something like that.