DVA4613
Captain, B767-300
E-MAIL
Joined on June 21 2007
Online Century Club
Triple Century Club
"Idle, Flare, Rollout, CMD" Wilmington, NC
326 legs, 994.4 hours
129 legs,
418.7 hours online 224 legs,
748.4 hours ACARS
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Posted onPost created on
August 11 2008 22:57 ET by Terrell Brownlee
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Ok, whenever I reach cruise in an aircraft (maybe a 757, 767, or an A330), maybe FL350, I get to about 300 KIAS and the Overspeed clicking noise and the warning light comes on. Why can I not go like 500 KIAS or another higher speed; is it a FS thing or is it because of my flight level? The only reason I am asking is just out of curiousity.
Terrell BrownleeCaptain, B767-300
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DVA2099
Captain, B757-200
Joined on January 19 2005
Century Club
Online Century Club
Toluca de Lerdo, MEX Mexico
142 legs, 282.0 hours
105 legs,
206.0 hours online 58 legs,
104.0 hours ACARS 21 legs,
45.3 hours event
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Posted onPost created on
August 11 2008 23:03 ET by Felix Madrazo
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DVA4613
Captain, B767-300
E-MAIL
Joined on June 21 2007
Online Century Club
Triple Century Club
"Idle, Flare, Rollout, CMD" Wilmington, NC
326 legs, 994.4 hours
129 legs,
418.7 hours online 224 legs,
748.4 hours ACARS
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Posted onPost created on
August 11 2008 23:06 ET by Terrell Brownlee
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DVA421
Senior Captain, B727-200
Joined on February 18 2002
Online Double Century Club
Six Century Club
Monroe, NC USA
671 legs, 1,267.5 hours
380 legs,
717.0 hours online 148 legs,
203.6 hours ACARS 1 legs,
1.8 hours event
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Posted onPost created on
August 12 2008 09:54 ET by Joe Shikany
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On your airspeed indicator there is a stripped pointer. This marks your Vne, never exceed indicated airspeed. As you climb, the pointer will move downward to lower indicated airspeeds. When reaching the upper 20's, you will change your climb speed from indicated to a Mach number, like M.72, then climb at that speed.
When reaching your cruise altitude, you can increase to your desired cruise Mach speed. This will keep you from overspeeding.
Same for descent, descend at some Mach speed until your indicated airspeed indicates say 330 knots, then descend at the indicated airspeed.
Joe ShikanySenior Captain, B727-200
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DVA1427
Senior Captain, MD-11
OLP
Joined on December 14 2003
Online Double Century Club
50 State Club
Tri-Jet Triumph
Globetrotter
Moose Club
US Capital Club
Everett 250 Club
Quincentenary Club
DVA Twenty-Year Anniversary
"Livin' in the Dog Pound!" Kannapolis, NC
558 legs, 1,984.3 hours
250 legs,
611.8 hours online 384 legs,
1,530.5 hours ACARS 38 legs,
82.7 hours event
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Posted onPost created on
August 12 2008 13:33 ET by Lewis Gregory
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Indicated airspeed (what shows on your airspeed indicator) decreases with altitude. At FL350, a true airspeed of 450 knots might only be 250 knots indicated. That's why generally over about FL250 or so, you'll switch to using Mach number to control your speed. Remember...indicated airspeed is the important number. Groundspeed is your "actual" speed (true airspeed modified by winds) but indicated airspeed is what you need to watch to make sure your plane does not stall or overspeed, and is flying efficiently.
Passenger jets generally have two maximum speeds listed--the never-exceed airspeed and the never-exceed Mach number. Getting well up into the flight levels, the Mach number becomes the limiting factor of how fast the plane can go. You'll see that happening, as Joe mentioned, when the striped pointer on the airspeed indicator--sometimes called the "barberpole"--begins to move downward. So if your plane's max speed was listed as 330 KIAS or M.84, you'd see the barberpole parked on 330 knots until you climb above the altitude where 330 KIAS = M.84. Then it would start to move downward, pointing to whatever airspeed equaled M.84 at that point.
Make sure that FS is set to display indicated airspeed on the ASI, NOT true airspeed.
Lewis GregorySenior Captain, MD-11
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