Tire Pressures?

Lee · Post by **Lee** » Sat Jun 10, 2006 4:06 am

Dumb question ... what are the recommended tire pressures for both mains and tailwheel? (The owner's manual for my '54 says 24psi ... and I thought I saw a note here that Scott tws should be at 35psi?) Thanks!

R/Lee

cessna170bdriver · Post by **cessna170bdriver** » Sat Jun 10, 2006 4:18 am

Lee,

I just reinstalled my glove box today and noticed that the silkscreened tire pressure note is still there on the inside of the door. 24 psi mains, 35 psi tailwheel.

Miles

Lee · Post by **Lee** » Sat Jun 10, 2006 4:23 am

As we say here in Memphis, "Thank You, Thank You Very much"!

Seriously, I appreciate the info ... Regards, Lee

beeliner · Post by **beeliner** » Tue Jun 13, 2006 12:43 pm

From memory, I recall that 50psi is the max listed on the tire on my tailwheel. There is little air volume difference between 35psi (book psi) and 50psi. If you fumble the air gauge just a bit you let out that much. So I just shoot for 50 psi. Plus, a small leak gets you from 50 to below 35 real quick.
The mains are another story. Excessive pressure there means a tire that is too hard.

Lee · Post by **Lee** » Tue Jun 13, 2006 1:08 pm

I adjusted the mains and as you said, found out that the difference between 35 and 35+ psi isn't much!

Then there is the matter of the accuracy of the pressure gauge?! Oh, well .... R/Lee

Post by **GAHorn** » Tue Jun 13, 2006 1:45 pm

beeliner wrote:From memory, I recall that 50psi is the max listed on the tire on my tailwheel. There is little air volume difference between 35psi (book psi) and 50psi. If you fumble the air gauge just a bit you let out that much. So I just shoot for 50 psi. Plus, a small leak gets you from 50 to below 35 real quick.
The mains are another story. Excessive pressure there means a tire that is too hard.

The max pressure inscribed upon a tire's sidewall relates to the strength of the tire....NOT the vehicle upon which it is mounted. Tire pressures are specified in order to accomodate the relative weight of the vehicle, and simply may not exceed tire design pressure.
Do not utilise information on the tire sidewall to determine the proper tire pressure for your airplane (or car/truck/etc.) except as a maximum pressure not to be exceeded for safety purposes regarding bursting (or in the case of cars/trucks/etc as regards the tires maximum weight-carrying recommendations.)

Lee · Post by **Lee** » Tue Jun 13, 2006 3:33 pm

Actually, I found the screened pressures inside the glove box lid ... I put 24 psi in the mains and 35 in the tailwheel. FWI ... tire pressures are checked every 24 hrs on FedEx A/C and the A/C is considered "down" if this is not done and signed off. R/Lee

The International Cessna^® 170 Association

Tire Pressures?

Tire Pressures?

Thanks!

Tire PSI

Yup!