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Joined: Sun Jun 27, 2004 12:52 pm

ATR 42/72 Startup

Tue Jul 13, 2004 9:19 am

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
Posts: 3766
Joined: Tue Dec 30, 2003 5:30 am

RE: ATR 42/72 Startup

Tue Jul 13, 2004 10:04 am

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.
Posts: 301
Joined: Mon Oct 29, 2001 1:13 pm

RE: ATR 42/72 Startup

Tue Jul 13, 2004 1:02 pm

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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