F19 Engine Operating limitations

[Robert Lees]

I am confused over the following extract from Type Certificate 1a9:

See NOTE 3
For aircraft S/N F-001 to F-153 inclusive:
For all operations: 2750 rpm (100 HP)

For aircraft S/N F-154 and up:
Maximum Normal Operating Power: 2500 rpm (73 HP)
For all operations: 2750 rpm (100 HP)

and

NOTE 3. In order to comply with the requirements of Part 36 of the Federal Aviation Regulations, revised engine limits have been established for the Model F19, S/N F-154 and up. Serial number effectivity was determined by FAR 36.501.

FAR 36.501 refers to noise levels.

Can someone explain what the difference is between "Maximum Normal Operating Power" and "For all operations" means in the above context? Shirley "all operations" at 100HP takes precedence over "Max normal operating power" of 73HP?

Rob

[mhorowit]

Re: F19 Engine Operating limitations

Shirley "all operations" ...

Rob

Wasn't she the town pump?

[fearofpavement]

Re: F19 Engine Operating limitations

Well, it appears that what they are saying (or meaning) is that although the engine is certified for the higher rpm, for noise abatement purposes you should keep it at or below 2500 but don't have to if you don't feel like it... The earlier serial numbers weren't subject to the noise limitations.

[Forrest Barber]

Re: F19 Engine Operating limitations

No F-19 was built after ser#154 to this date. Any new ones have to conform to those noise requirements.
I flew the FAA noise tests here near Alliance for the F-21 and got us clear up to the 118HP from the 115 or even 112 that other manufacturers use (same engine 0235-L2C) I had a wise old test pilot for the FAA give me a few tips on how to do this, it had to do with wind and distance allowed from the test equipment. We had to do this at another airport because the TRUCKS on State Rt 225 were too noisy and threw off the calibrations..

[Robert Lees]

Re: F19 Engine Operating limitations

So long as it's only a noise thing, that's OK with me (believe you me, the Germans are the "experts" when it comes to noise certification issues).

Thanks for the replies.

Rob