Wondering if anyone has seen this before or has any ideas regarding cause / cure.
During flight the LH engine is intermittently experiencing a +/- 100rpm oscillation, pilot can feel & hear the variation, MP also moves in conjunction with the rpm, we have Horizon digital tachs in the aircraft so it's not an indication of a sticking tach cable. This can occur at different phases of flight and power settings, I haven't observed it while running on the ground. In flight magneto check while the hunting was occurring had no effect.
So far I've replaced the governor, propeller & fuel servo with no change.
Regards,
Steve...
During flight the LH engine is intermittently experiencing a +/- 100rpm oscillation, pilot can feel & hear the variation, MP also moves in conjunction with the rpm, we have Horizon digital tachs in the aircraft so it's not an indication of a sticking tach cable. This can occur at different phases of flight and power settings, I haven't observed it while running on the ground. In flight magneto check while the hunting was occurring had no effect.
So far I've replaced the governor, propeller & fuel servo with no change.
Regards,
Steve...