The International Cessna^® 170 Association

Need to know where to find the correct indicator or have one made with correct markings. The one I just removed is leaking like a sieve, says RCAF on the back, and was made in canada.Also, what should the range markings be.

thx

The number of 170a,s that I have looked at over the years including my own ,and these include one in England and a couple in Canada plus a couple in the USA has me believing that Cessna sourced some of these ASI,s from a source from the RCAF. I tossed mine [ASI] out a couple of years ago as it was leaking from the case and purchased a new one from Spruce.
The type data certificate is a wealth of knowledge with the limits that you require.
Now the reason why I was looking under the instrument panels of a number of aircraft was before I incorporated the STC with the larger engine I was curious how the structure was standing up to the extra stresses and how those heavier brackets internally were handling it . Surprisingly no cracking or working rivets have been found on Lycoming modified aircraft . [Those shakey 4 bangers ]

You could send yours into Keystone Instruments in Lock Haven Pa and have it overhauled or if you think it marked correctly, they can duplicate the plate in another core.

The correct range markings are listed in the Limitations section of the Airplane Flight Manual which is the two page document you are required to have in the airplane, not the owner's manual. I you do not have one they are available free to association members, sorry not forum members in the MX library section. The International Cessna 170 Association is a great source of information on the operation and maintenance of these airplanes, well worth the cost of membership.

Tim

I looked them up to make sure that I remembered correctly where they were. Curiously the bottom of the white arc representing flap down stall speed is 55 mph and the bottom of the green arc representing flaps up (retracted) is 59 mph for all three models even though the wings and flaps are significantly different.

This unit from Canada has the range markings on the outside of the glass, so definitely not original. I did make a copy of the TCDS info that shows the Never Exceed Speed as 160mph true, but I dont know what the range of the AS ind is, 180mph, 200mph? There is no AFM in the plane.

Thx for all the help

I was hoping that you would join the Association, but you may not be the aircraft owner, just the mechanic caring for this aircraft. Here is what you need for the airspeed. It is a 180 mph unit, the red line is at 160 mph, the yellow arc is from 140 to 160 mph, the green arc is from 59 to 140 mph, and the white arc is from 55 to 100 mph on the 170A and 170B and 55 to 90 mph on the straight 170. The first "tick" mark is at 30 and the numbered markings are at 40, 60, 80, 100, 120, 140, 160, and 180 mph with a full "tick" each 10 mph and a half "tick" at the fives.

In the USA if the Airplane Fight Manual is not on board the airplane at a ramp check it would be grounds for a violation, not sure about Canada but would guess it is the same.

Hope this helps, Tim

Thx Tim, the plane is based in Idaho. I actually used to belong to the association when I owned a 1955 170B, but sold it a few years ago. It actually still had the Goodyear Xwind gear on it when I bought it, took those off and installed Cleveland.

Thx again for all of the associations help,

steve