M 20 C, bottom of yellow arc? Vno

[Urs_Wildermuth]

Folks,

 

question to run by you experts here:

 

My M20C, SN 3269, has got a bottom of the yellow arc marking on the airspeed indicator of 155 mph/135 kt.

 

If we look at the manuals, we find a figure of 150 mph/130 kts.

 

What could be the explanation for this? Are there different years of Mooneys with different Vno figures?

[Hank]

Makes me wonder if the ASI has been replaced sometime. I've heard of 150 and 175 mph, depending on the year, but not 155. The instrument should match the Owners Manual.

[Marauder]

Folks,

question to run by you experts here:

My M20C, SN 3269, has got a bottom of the yellow arc marking on the airspeed indicator of 155 mph/135 kt.

If we look at the manuals, we find a figure of 150 mph/130 kts.

What could be the explanation for this? Are there different years of Mooneys with different Vno figures?

There are some differences between model years but Hank is correct that the information in the manual for the plane is supposed to match what is on the gauge.

[orionflt]

I have a C model SN# 1993, the flight manual and airspeed indicator are both the same at 150 MPH 130 knts.

 

Brian

[mooniac15u]

Here's the data from the type certificate:

 

Airspeed Limits (Aircraft with serial numbers to 680001)

Maneuvering......................................... 132 m.p.h. (115 knots) True Ind.

Never exceed ........................................ 189 m.p.h. (164 knots) True Ind.

Flaps extended...................................... 100 m.p.h. ( 87 knots) True Ind.

Landing gear extended ......................... 120 m.p.h. (104 knots) True Ind.

Maximum structural cruising................ 150 m.p.h. (130 knots) True Ind.

 

(Aircraft with serial numbers to 680001 to 690001)

Maneuvering......................................... 132 m.p.h. (115 knots) True Ind.

Never exceed ........................................ 189 m.p.h. (164 knots) True Ind.

Flaps extended...................................... 125 m.p.h. (109 knots) True Ind.

Landing gear extended ......................... 120 m.p.h. (104 knots) True Ind.

Maximum structural cruising................ 150 m.p.h. (130 knots) True Ind.

 

(Aircraft with serial numbers to 690001 thru 700091 and 20-0001 and up)

Maneuvering......................................... 132 m.p.h. (115 knots) True Ind.

Never exceed ........................................ 200 m.p.h. (174 knots) True Ind.

Flaps extended...................................... 125 m.p.h. (109 knots) True Ind.

Landing gear extended ......................... 120 m.p.h. (104 knots) True Ind.

Maximum structural cruising................ 175 m.p.h. (152 knots) True Ind.

[mooniac15u]

"True Ind" airspeed is the old CAR3 terminology for Calibrated Airspeed. From CAR3 3.46:

 

(b ) "True indicated" or "calibrated" air

speed for performance and operating purposes

equal to indicator reading corrected for position

and instrument errors.

[Mooneymite]

Getting a Mooney owner to tell "true airspeed" is about as likely as a fat woman telling her true weight.

Lying about airspeed on this forum is considered a piloting skill. :-)

:-)

And, yes. My C regularly cruises at, or near the speed-of -sound (of my lies).

I'm not sure that is reflected in the type certificate.

[Marauder]

Getting a Mooney owner to tell "true airspeed" is about as likely as a fat woman telling her true weight.

Lying about airspeed on this forum is considered a piloting skill. :-)

:-)

And, yes. My C regularly cruises at, or near the speed-of -sound (of my lies).

I'm not sure that is reflected in the type certificate.

Someone say "FAT Woman"?

[Urs_Wildermuth]

Right, thanks guys. I did get an answer from Mooney´s Mike Miles a few minutes after writing my mail to them, top service. The ASI is wrong and the manual right, as expected. Looks like nobody noticed this in 50 years of operation. Well, time to get the paintbrush out for my instrument mechanic.

[bonal]

Someone say "FAT Woman"?

Nnnnooooooooooo.....

[Hank]

Nnnnooooooooooo.....