Delta's New 717

bought us a whole new fleet of 18-wheelers!

You uhh, you got yourself a convoy there Rubber Duck?

convoy_1978_300x427_236250.jpg
 
Hopefully, you Delta pilots will comply with the "accelerate to 250 kts or advise" part of the SIDS, unlike a lot of those Air Tran pilots...
 
What the hell are you talking about?
Air Tran pilots are notorious for not accelerating to 250 kts ASAP to save money in maintenance on the engines. I can't remember the "technical" name of the procedure at the moment, but it happens all the time.
 
Air Tran pilots are notorious for not accelerating to 250 kts ASAP to save money in maintenance on the engines. I can't remember the "technical" name of the procedure at the moment, but it happens all the time.

You're probably talking about a derated climb. On the 717 you can derate either 15% or 20% (or not at all) depending on weight. The thing is, that has almost nothing to do with airspeed unless there is some sort of altitude restriction they have to make as well.
 
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You're probably talking about a derated climb. On the 717 you can derate either 15% or 20% (or not at all) depending on weight. The thing is, that has almost nothing to do with airspeed unless there is some sort of altitude restriction they have to make as well.
That very well could be it. We were told at work, that they get rebates on the maintenance for not accelerating ASAP to 250 kts on takeoff. It is VERY noticeable when guys are being rolled behind AT B717s. Like I said, not all do it, but a whole bunch do. I'm just curious if the "performance" will improve with Delta flying and maintaining the planes versus Air Tran.
 
Air Tran pilots are notorious for not accelerating to 250 kts ASAP to save money in maintenance on the engines. I can't remember the "technical" name of the procedure at the moment, but it happens all the time.

Some airlines have a climb profile that we have to stick to...you know cleaning up the flaps, various other things that preclude an acceleration to 250 knots immediately after liftoff. At my company, on the Bus, we accelerate to Min Clean Speed (Green Dot), while cleaning up (above 1000 AGL) and hold that until 3000 AGL, where we then accelerate to 250 knots (or as directed). That's for a Distant departure. A Close-In is T/O power until 1500 AGL, then V2+15 to 3000 AGL and clean up on schedule.


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Air Tran pilots are notorious for not accelerating to 250 kts ASAP to save money in maintenance on the engines. I can't remember the "technical" name of the procedure at the moment, but it happens all the time.

You've been told a bunch of BS. Our profile is to accelerate to 250, and I've never seen anyone do anything different. We're a highly standardized airline. We do use derated takeoff power most of the time, which means you have a slower rate of acceleration than you would if you were using full rated power, but it's only a marginal difference.
 
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That very well could be it. We were told at work, that they get rebates on the maintenance for not accelerating ASAP to 250 kts on takeoff. It is VERY noticeable when guys are being rolled behind AT B717s. Like I said, not all do it, but a whole bunch do. I'm just curious if the "performance" will improve with Delta flying and maintaining the planes versus Air Tran.

At high weights, and at high temps, we depart out of some airports doing something like V2+10 until 2,000' AGL.

That's usually around 150 knots.

The man says to do it, so we do it, regardless of what we think of it.
 
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That very well could be it. We were told at work, that they get rebates on the maintenance for not accelerating ASAP to 250 kts on takeoff. It is VERY noticeable when guys are being rolled behind AT B717s. Like I said, not all do it, but a whole bunch do. I'm just curious if the "performance" will improve with Delta flying and maintaining the planes versus Air Tran.
They probably get "rebates" (not really, but increased time on the engines, we do) for flex departures but that has nothing to going to 250, either you understood incorrectly or the person telling you didn't quite understand what the deal was.

Reduced power takeoffs are very popular I would assume throughout the industry as a whole, as they greatly reduce wear and tear on engines.
 
You've been told a bunch of BS. Our profile is to accelerate to 250, and I've never seen anyone do anything different. We're a highly standardized airline. We do use derated takeoff power most of the time, which means you have a slower rate of acceleration than you would if you were using full rated power, but it's only a marginal difference.

Takeoff thrust should have no bearing on climb thrust application and acceleration profile.
 
Takeoff thrust should have no bearing on climb thrust application and acceleration profile.

I'm guessing he means derated climb thrust, not TO thrust as that's a flex not a derate.

EDIT: Because you are climbing at V2+X until you hit your acceleration altitude which is when climb thrust kicks in anyway. So there won't be any acceleration until you are in the climb setting and out of the TO setting.
 
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