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Originally Posted by W0X0F
I'll do some research on my flight back to JFK tomorrow evening. I'll have some numbers posted for you this Thursday.
Here are the numbers I noted on my return flight from San Franscisco. I forgot about doing this until the last hour of the flight, so it's a little limited:
What's idle? 8-12%?
In flight, idle power will vary by altitude. I noted 44% rpm at 32,000' and 32% rpm at 10,000 with the throttles at idle.
On a normal landing how much thrust to keep power immediately available?
This will vary depending on the aircraft weight and the weather conditions. During my approach tonight, I observed 52-57% rpm during the approach with 25° flaps and gear down.
On take off what % are you typically using?
I forgot to note this number tonight. We took off with reduced power, but I'm sure it was still over 90% rpm.
When do you use 100% of what's available?
Full power takeoff. Go around. Windshear recovery.
What % is typically being used at cruising altitude?
At 37,000', we were at 78% rpm.
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I think there's quite a bit of variance at altitude to save fuel or make up time? If you're behind do you fly as fast as possible to get back on schedule? Is there some magic formula from the company on allowable fuel, % power, vs time made up?
There is no magic formula and it's hard to make up a lot of time, but we do push up the power if we're behind. On a transcon flight, it's pretty hard to make up even 15-20 minutes.