Flybyguy From United States of America, joined Jun 2004, 1801 posts, RR: 1 Posted (10 years 3 months 2 weeks 4 hours ago) and read 4326 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 UK - England, joined Dec 2003, 3631 posts, RR: 15
Reply 1, posted (10 years 3 months 2 weeks 4 hours ago) and read 4253 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.