xyz_pilot.
Thank you.
JW411,
The FH227B flight operating manual (as well as some models of the Fokker F.27 contained a restriction on using flight idle due to rapid wear to planetary reduction gearing in the engine. In addition, the F.27 Mark 400 contained a restriction for engine ops between 12,500 and 14,000 rpm due to undesirable airframe vibration.
All of these models were Dart 7 powered.
Considering the falling brick scenario mentioned with regard to the 'ole Dart engine when in flight idle...and considering further that the F.50 did just that, made like a falling brick after flight idle was selected, perhaps a restriction in the AFM would be a good idea.
If a turbine engine enters a sub-idle state, or propellor pitch stops fail to work as advertised, acceleration might indeed prove difficult.
Last edited by 411A; 18th Nov 2003 at 06:09.