Quote:
Originally Posted by papanovember
Hey Eagle guy here. We have a big discussion on this going on at the lounge.
Just wanted to compare our climb profile vs yours. Our AOM recommends climbing at 270/.56 (FLC) when practical and 290/.65 other times. We have almost completed modifying all our 145s to allow a MGTOW of 49,823. Since the modifications nothing has been changed regarding our profiles. They remain the same for all our aircraft (135, 140, 145) Some people have been seeing the PLI come down when climbing at .56 up high and heavy.
I was just curious to see what your profiles are. Do you have an econo climb and a fast climb? Are they different in different types (135, 145, XR)? Is your FLC programed for 270/.56 or something diffent? I have heard some operators have FLC programed for 290/.65. Finally, do you guys climb in speed mode or VS? At least on our aircraft speed mode causes uncomfortable pitch movements so I along with everyone I fly with use vs.
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The vast majority of pilots here uses vertical speed mode to climb and descend, but most use that mode to maintain a (somewhat) constant airspeed/mach number, not a constant vertical speed. Like someone said earlier, we are pretty standardized in using 290/.65 in the EP/LR and 290/.60 in the XR. The XR's mgtow is about 53,000 lbs. If you takeoff weighing about 50,000 lbs you will fall below the low speed buffet margin if you attempt to climb straight to FL370 at .60 mach (meaning you could potentially stall the airplane if you encountered a significant bank angle). Accelerating to .65-.70 mach once you get into the mid 30's usually prevents this problem. The same thing would undoubtedly happen in an LR or EP if you tried climbing it at .56-.60 at weights close to MGTOW.
You should have low speed buffet margin charts somewhere in your CFM or performance manuals. Keep the speed at or above what the chart specifies. Allowing the speed to accelerate to .65-.70 when you pass FL300 is a good policy when you're operating a heavily loaded EMB-145. That should keep you above the low speed buffet margin and free from the PLI in most scenarios.
Our FLC modes in the EP/ER/LR's are the same as yours, 270/.56, but they are rarely used. The XR FLC modes holds 290/.60, but VS is still used by most pilots because of the autopilot's erratic pitch corrections in FLC mode.
Hope things are going well for you at eagle, fly safe.