July 10, 200916 yr Just curious, is climbing to your cruise altitude at an airspeed of 315 per FMC calculations ok? I was always under the impression you were to climb at an airspeed over FL100 at no more than 280.Thanks
July 10, 200916 yr There is generally no speed restriction above 10,000.Please sign your name to posts in this forum. Dan Downs KCRP
July 11, 200916 yr Just curious, is climbing to your cruise altitude at an airspeed of 315 per FMC calculations ok? I was always under the impression you were to climb at an airspeed over FL100 at no more than 280.ThanksIn the US the aircraft is limited to 250KIAS below 10,000 with no speed restriction above 10,000 unless assigned by ATC. The 250KIAS below 10,000 can be exceeded without notifying ATC for operational reasons. This would basicly be going to the clean airspeed (flaps/slats up) which would be about 260/265 depending on the weight for the B747. When flying in certain parts of the world I will get the clearance "High Speed Approved" which means I have no speed restrictions. Bill Bridges I Earned My Spurs in Vietnam
July 12, 200916 yr Author Sorry, I wasn't talking about speed restrictions, just climbing at the speed of 315 to cruise altitude with engines running at nearly 98% to keep that speed up. Just seems a bit high.Thanks,Chris
July 12, 200916 yr Sorry, I wasn't talking about speed restrictions, just climbing at the speed of 315 to cruise altitude with engines running at nearly 98% to keep that speed up. Just seems a bit high.Thanks,ChrisCompletely normal...and the harder you are using your engines the faster you will get to cruising altitude. Steven Penninck
July 13, 200916 yr Author Completely normal...and the harder you are using your engines the faster you will get to cruising altitude.Thanks, I'll feel much better about giving them a workoutChris
July 13, 200916 yr Thanks, I'll feel much better about giving them a workoutChrisActually 98% n1 is pretty low if you are climbing...usually its around 105 at the beginning then is goes to 102 or so later on. So you must of been pretty light. Steven Penninck
July 13, 200916 yr Author yeah, my flights usually are between 200-500nm which helps keep things light. yeah, my flights usually are between 200-500nm which helps keep things light.The wife wont give me more time to do longer flights.Chris
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