I've done some of my own research, but would like some other input.
I have a 1975 172M, with what I believe is the origional propeller. I can find only two entries in the Airframe Log pertaining to the propeller, one stated total time in service in 2000 and the other states inspected IAW the 100 hour inspection (back in the 80's). The propeller appears in good condition and I have it inspected and maintained every year by my Maintenance FBO, but I can find no reference to the make and model, and there is no propeller log.
My question is this; the propeller has 3800 hours on it per my records, was installed 1975. I am about to do my MEOH and I was going to have a propeller overhaul at the same time (and start a propeller log). Should I do the propeller overhaul, and if so by Cessna???, or replace the propeller.
If I replace the propeller what should I replace it with. I'm boosting the engine to 160 Hp (IO320 Engine) and putting on a Power Flow during overhaul for 182 theoretical hp. I fly a fair amount on business (Approx 8 hours a week average) and often go to higher altitudes (KTLV, KMEV, etc,) so I'm looking for climb rate and cruise economy.
Any suggestions out there, and does anyone know what the origonal propeller on a 1975 172M is.
As a added note, the Propeller is currently well maintained, and serviced (but should have an OH), 28 years old. It also has great performance now, both in cruise flight and in climb, though I'm boosting the engine for better climb at higher DA with more weight (I usually fly Single Pilot).
Re: C172M Propeller
If you are changing your horse power from 150 to 160 then your propellor shoud be repitched to 7557 i'm assuming your engine is an o320 i had the ram conversion from 150hp to 160 hp at overhaul and it stated that i had to repitch my prop from 7553 t0 7557 and i get great climb and good cruise. good luck and thanks for reading this. Bill.
Re: C172M Propeller
I am assuming that you are upgrading in accordance with an STC, the propeller required will be mandated by the STC whether repitched or a different model. The propeller should be signed off EVERY annual with an Airworthiness Directive Compliance listing reflecting all AD's that affect this propeller. Additionally, it is a requirement that the propeller have a cumulative Total Time entry in the log book. As far as identifying the propeller, it must be removed from the airplane to find the info. It is stamped on the face of the prop on the hub. There are really no requirements persay to overhaul the propeller, but in my shop I insist having the prop go thru the prop shop at engine overhaul. (Any reputable Propeller shop can do this) At the prop shop it is stripped, dye checked, profiled, measured, pitch checked, statically balanced and repainted. I checked the Type Certidicate Data Sheet for your airplane and it does in fact list a 1C160/CTM 7553, so it is legal. I am surprised that the paperwork from your last annual does not list the Propeller info, It would make me wonder if an AD search was done on the propeller, as there are a few AD's on this model. Most all older airplanes did not come with a propeller log and the info is usually contained in the airframe log, It is legal and recommended to start one as I always do when the paperwork does not have a prop log.
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