1966 M20E RPM Restriction Question

[Cessna738]

Hello,

My manual states no continuous operation in the 2100-2350 rpm range. Has this changed via supplement since 1966? I have been told that it is 2000-2350 for some older Mooneys. Also, does range mean 2101-2349 not used? My manual lists 2350 as an OK rpm in the cruise date, but not 2000? Thanks for your help.

 

[PT20J]

TCDS says 2000 -2350. 

[Ragsf15e]

4 minutes ago, PT20J said:

TCDS says 2000 -2350. 

I’m not sure exactly how the stc vs tcds plays out, but there are other props now approved with some (slightly) different restriction ranges.  Eg - Mcauley props which aren’t on that tcds.

One other interesting thing is that my edm930 has the non continuous range marked in yellow, not red as indicated here.  But then I have a different prop…

To the OP, most people find there are some times they must operate in that regime for short periods of time (usually on final or instrument approaches).  But we mostly agree we should not cruise there or stay in that regime longer than necessary.  There’s your free internet opinion.

[PT20J]

If another prop is installed by STC, that would supersede the TCDS. If the the restricted range changed , I would expect the STC to require remarking the tach.

[Ragsf15e]

Just now, PT20J said:

If another prop is installed by STC, that would supersede the TCDS. If the the restricted range changed , I would expect the STC to require remarking the tach.

I think that’s exactly what it says in the STC for the Mcauley props.

[Cessna738]

Thanks for your help. I should be in the 2000-2350 limitation.