Instrument Marking

[silvano]

I have a Taylorcraft Bc-12D converted F19 (continental O-200).
I am redoing the instrument panel. I was wondering which marking are appropriate on the instruments.

My proposal is:

Airspeed:
VNE read line at 136 mph
yellow arc 104 to 136 mph
green arc 43 to 104 mph

Tachometer
red line at 2570

Oil Pressure
Red lines at 10 PSI and 100 PSI
Green arc 30-60 PSI

Oil Temperature
Red lines at 100 and 240 F
Green arc 100-240 F

Any suggestions?

Thank You

-- Silvano

[Mark Julicher]

Re: Instrument Marking

I personally don't put green arcs on oil pressure and oil temp. Just red lines at the limits. You are probably not going to fly with 60 psi showing on the oil pressure nor with 240 degrees oil temp.

Your other numbers appear to be correct IAW the TCDS.

[astjp2]

Re: Instrument Marking

Redline on the engine should be 2750, if not you are not getting the horsepower only 73 @2500 per the F-19 TCDS. Tim

[Ragwing nut]

Re: Instrument Marking

all the markings for F-19 should be listed in the tcds sheets

[magman]

Re: Instrument Marking

My thought is a Green Arc is less confusing.

I've had folks question WHY there engine always needed work.

They said they couldn't understand it because they always had 20 lbs Oil Pressure!

[barnstmr]

Re: Instrument Marking

The FAA Approved Airplane Flight Manual is the place to find the instrument markings. If you mark the instruments any other way, it is not FAA approved and would require review and approval by the FAA or a DER. This is not something to mess around with. It is not a matter of what looks the best or feels right. Even if they did it wrong at the factory, the AFM is FAA approved. If you end up in a mishap, try explaining to your insurance company why you marked them any way other than the FAA approved way.

[silvano]

Re: Instrument Marking

Thanks for all the suggestions.
I have fixed my marking.
I agree that the flight manual is the place where to read them, but the flight manual has two sets one for utility category and one for normal. I was confused which to use, but them I found a mandatory placard that states: "aircraft marked for normal category only", so I had my answer and corrected the numbers.