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ATR 42/72 Startup  
User currently offlineFlybyguy From United States of America, joined Jun 2004, 1801 posts, RR: 1
Posted (10 years 1 month 3 weeks 1 day 16 hours ago) and read 4187 times:

Hi everyone,

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
2 replies: All unread, jump to last
 
User currently offlineArmitageShanks From UK - England, joined Dec 2003, 3621 posts, RR: 15
Reply 1, posted (10 years 1 month 3 weeks 1 day 15 hours ago) and read 4114 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.

User currently offlineLiamksa From Australia, joined Oct 2001, 308 posts, RR: 0
Reply 2, posted (10 years 1 month 3 weeks 1 day 12 hours ago) and read 4091 times:

The ATR's have a prop brake which allows the gas generator to be running without spinning the prop (Hotel mode), supplying both bleed air and power.

Nifty little feature which is AFAIK only available on the ATR's - handy when there's no APU or ground power.


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