10 Year Prop Overhaul Canada

[Scudrunner]

Just browsing the COPA magazine, they briefly mention

“Ten- year propeller overhaul: we are looking toward new data to reintroduce the topic with Transport Canada”

I think in the states it’s time on prop limit.

What about the rest of the world ? Is Canada a special place that props go flying apart after 10 years ?

[trey kule]

Of course not.

They fly apart at 10 years and one day. That is why the limit of 10 years.
The life limit was determined by TC after a gender inclusive, equal rights assessment that Canadians expect and deserve.

What! Didyou think they just arbitrarily pulled that 10 year limit from out of the air.?

[Slick Goodlin]

Wait, what? All props?

[Nark]

Jokes on you guys: the Twin Beech’s Ham Stan props are 5 years, so I guess it’s 10 years per airplane.

Thankfully I wasn’t dumb enough to buy the Spruce Goose.

[anofly]

All constant speed props..
Data from a respected canadian prop shop , shows most props on imported american planes, that are often way past 10 yrs since overhaul, regularly fail inspection criteria for overhaul...

[digits]

What's the weakest spot on constant speed props? Let's say you keep running them indefinitely, what kind of failure mode is to be expected first?

Is it a matter of not holding RPM properly anymore, desintegration of the blade due to centrifugal forces, the whole thing exploding, something else ... ?

[Squaretail]

The few I have seen fail their inspections had too much filed off of them. Props run on gravel if improperly handled can take a lot of wear.

[Nark]

I have an avoid range of 1850-2000 RPM (I think, it’d have to check the POH) on the Beech. So there’s is harmonic resonance in there too.


*caution thread derail*
Even though you asked about constant speed, my Stinson’s MET-L prop had an avoid range as well (2100-2300 RPM if is can recall).

Ground resonance is a pretty big thing for helicopters too (depending on the make up of the hub). A pretty well known example is in the opening scene to a McGyver episode when they get dropped off on the roof of an LA skyscraper.

[anofly]

Well the one failure mode that created an AD on steel hub Hartzell props , had to do with corrosion . The props might be 20 years plus since overhaul in the usa , and they shed the odd blade....
They improved the blade clamp design to hold them together.... very small corrosion pits will condem a blade to scrap...

[Nark]

Speaking of props: