§ 1031.40 Turboprop engines.
The following standards apply to turboprop engines with rated output at or above 1,000 kW:
(a) Smoke. Engines of a type or model for which the date of manufacture of the individual engine is on or after January 1, 1984, may not have a characteristic level for smoke number exceeding the following value:
SN = 187·rO−0.168(b) [Reserved]