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Old 09-02-2009, 01:05 PM   #11 (permalink)
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Originally Posted by UpThere View Post
You know whats really sad about this thread..... E170/190 in the REGIONAL forum. No regional shold be flying 170s or 190s, and I can say that because I fly for a one!!!
RAH is no longer a regional so that just leaves Compass.

Now with the help of Frontier, Midwest, and our own pilots, lets strive for a great contract flying the 170/190.

Oh, if you use CON for cruise flight, you are too high. Do not use it unless single engine
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Old 09-02-2009, 07:46 PM   #12 (permalink)
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if you are flying in cruise with the LIM on you will also have the eyebrows up...you might be to high for cruise.

If you are increasing speed once you level off the CLIMB 1 will be enough to get the LIM to go away
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Old 09-02-2009, 07:51 PM   #13 (permalink)
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From an outsider:

1) Does doing this raise your ITTs?
2) How much of a speed difference are we talking about?


If the answer is "yes" and "less than thirty knots," it probably isn't worth it.
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Old 09-02-2009, 08:15 PM   #14 (permalink)
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From an outsider:

1) Does doing this raise your ITTs?
2) How much of a speed difference are we talking about?


If the answer is "yes" and "less than thirty knots," it probably isn't worth it.
1. It depends on what setting you're already in and in what phase of flight. But most likely, YES.

2. Kinda a vauge question. But I think people were using this setting to climb faster at a set speed. Or using it to get to cruise speed faster when leveling off. I wouldn't recommend it.


There is a reason for 2 different settings. CON is for max continuous. CRZ is for cruise. If they were interchangeable, then there wouldn't be 2 settings. Fly by the book. The only time we call for CON is in a single engine operation.
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Old 09-03-2009, 04:43 AM   #15 (permalink)
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Quote:
Originally Posted by UpThere View Post
You know whats really sad about this thread..... E170/190 in the REGIONAL forum. No regional shold be flying 170s or 190s, and I can say that because I fly for a one!!!
Useless response.
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Old 09-03-2009, 06:05 AM   #16 (permalink)
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Why would you want to cruise at a speed that requires CON power anyway? What's the rush, unless it is the last leg? Plus, I've never had a problem cruising at Mach .81, so I don't see a reason why CON would ever get used in normal ops.
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Old 09-03-2009, 06:53 AM   #17 (permalink)
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Quote:
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You know whats really sad about this thread..... E170/190 in the REGIONAL forum. No regional shold be flying 170s or 190s, and I can say that because I fly for a one!!!

DING DING DING DING DING........

Somebody gets it.....
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Old 09-03-2009, 06:58 AM   #18 (permalink)
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My company's SOPs have normal cruise limited to M.78 or less, for improved fuel economy and less wear and tear. Economy cruise is usually slower than that, depending on cruise alt, weight, etc. CON should be used only in emergency situations...that is its sole purpose. It is normal for us to see LIM briefly upon level off at cruise, but just for a few moments as the speed catches up. Hope this helps
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Old 09-03-2009, 07:32 AM   #19 (permalink)
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The only time I've used CON power is in the sim when it's called for on a single engine climb out. We use climb 1 on a pretty regular basis and only get LIM if we're climbing in V/S or FPA modes. You won't get LIM in FLCH mode. The 170 climbs a lot better than the 175 when we're heavy, so you will normally see LIM in the 175 when you're trying to maintain 290 in the climb and at least 1500'/minute above 27K or so.
To add to this...LIM appears when the actual speed is 5 kts or more less than the set speed in a climb (or greater than 5 kts in a descent). As you said, LIM only functions in FPA or VS, and so if it appears, the selected FPA pitch angle or VS climb rate is more than the engines can provide. The first thing that comes to mind for me is Pinnacle...why ask for a climb rate or pitch angle that results in a deteriorating airspeed? If level and the aircraft won't accelerate to or hold the selected speed, then the pilot needs to rethink the situation.

CON is an emergency power setting only according to Embraer. If someone is selecting CON to solve a cruise or climb speed issue, I suggest they refer to the performance manual for gross weight limitations.
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Old 09-03-2009, 07:35 AM   #20 (permalink)
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From Embraer

Quote:
MAXIMUM CONTINUOUS RATING (CON)
The maximum continuous thrust is to be used on emergency situation
where thrust higher than usual is required.
It is the highest thrust the engines can operate continuously without
reducing the time between overhauls.
I don't think "LIM" on the FMA qualifies as and "emergency situation".
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