wrote: > Well that's interesting. FAR Part 23 (airworthiness standards for normal,= utility, acrobatic and commuter airplanes) Section 1545 (airspeed indicator= ) says that the airspeed indicator must be marked with a red line at Vne (th= at would be an indicated airspeed) and that if Vne varies with altitude, the= re must be a way of indicating Vne to the pilot throughout the envelope. Fo= r airplanes operating at Mach numbers where compressibility matters (not Lan= cairs), Vmo is defined in Equivalent airspeed, which is still very close to I= AS, and there has to be a way of showing the variation of Vmo/Mmo with altit= ude and Mach number. >=20 > I've never met a light aircraft instrument system that had a primary airsp= eed indicator with anything *other* than IAS, and just one redline value. T= he Garmin 900, and I guess other EFISs, also read TAS but not on a big prett= y scale with a redline. You can set the redline on the airspeed tape conser= vatively so that it's below the lowest TAS for flutter at any altitude; then= you give away a few knots at lower altitudes. >=20 > How many folks spend any time at redline? I've never gotten anywhere near= it in my Legacy. >=20 > Charley Brown > Legacy #299 130 hr >=20 >=20 > On Jul 12, 2012, at 9:26 PM, Steve Colwell wrote: >=20 > Having coffee with some high time pilots this morning, the subject of Neve= r Exceed Speed came up. Before I read the original Van=E2=80=99s article ye= ars ago, I thought Indicated Airspeed was the indicator=E2=80=A6 WRONG, it i= s True Airspeed. Does your EFIS display TAS or do you have a table for refe= rence??=20 > =20 > http://www.vansaircraft.com/pdf/hp_limts.pdf=20 > =20 > Steve Colwell Legacy >=20 --Apple-Mail-FAF956FF-5C54-430B-9278-E1A91DFFB012 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

My IV-P shows a red line o= n the Chelton system at 276 KIAS. The POH says the same. I have b= een close to there more than a few times, which means if it is meant to be T= AS I have been WAY over that. I highly doubt Jeff Edwards messed that u= p when getting the flight certificate on my airplane. Can't be right, I= can almost cruise at 270 KTAS at FL250. Definitely not a universal ru= le.

Bob R

On Jul 13, 2012= , at 9:41 AM, Charles Brown <brow= ncc1@verizon.net> wrote:

Well that's interesting. FAR= Part 23 (airworthiness standards for normal, utility, acrobatic and commute= r airplanes) Section 1545 (airspeed indicator) says that the airspeed indica= tor must be marked with a red line at Vne (that would be an indicated airspe= ed) and that if Vne varies with altitude, there must be a way of indicating V= ne to the pilot throughout the envelope. For airplanes operating at Ma= ch numbers where compressibility matters (not Lancairs), Vmo is defined in E= quivalent airspeed, which is still very close to IAS, and there has to be a w= ay of showing the variation of Vmo/Mmo with altitude and Mach number.
<= div>
I've never met a light aircraft instrument system that ha= d a primary airspeed indicator with anything *other* than IAS, and just one r= edline value. The Garmin 900, and I guess other EFISs, also read TAS b= ut not on a big pretty scale with a redline. You can set the redline o= n the airspeed tape conservatively so that it's below the lowest TAS for flu= tter at any altitude; then you give away a few knots at lower altitudes.

How many folks spend any time at redline? I've n= ever gotten anywhere near it in my Legacy.

Charley B= rown
Legacy #299 130 hr

On= Jul 12, 2012, at 9:26 PM, Steve Colwell wrote:

Having coffee with some high time pilots this morning, the subj= ect of Never Exceed Speed came up. Before I read the original Van=E2=80= =99s article years ago, I thought Indicated Airspeed was the indicator=E2=80= =A6 WRONG, it is True Airspeed. Does your EFIS display TAS or do= you have a table for reference??

http://www.vansaircraft.com/pdf/hp_limts.pdf
<= div style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bo= ttom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">&n= bsp;
Steve Colwell Lega= cy

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