Np spikes? Anyone experienced this.
Thread Starter
Joined: Nov 2014
Posts: 15
Likes: 0
From: New Zealand
Np spikes? Anyone experienced this.
Have any small / GA pilots have had issues with Np indications having indicated momentary highs?
I have heard of issues with a few Np tacho generators. The prop isn't hunting, all other gauges fine, just momentary highs in the Np.
There has a been deep fault finding, and seems to come back to a single batch of tacho generators. They are used on many engines, so in this case assume it was on a turboprop.
Please, leave replies to folk who have actually seen this in flight.
Thanks in anticipation of a flood of replies.
I have heard of issues with a few Np tacho generators. The prop isn't hunting, all other gauges fine, just momentary highs in the Np.
There has a been deep fault finding, and seems to come back to a single batch of tacho generators. They are used on many engines, so in this case assume it was on a turboprop.
Please, leave replies to folk who have actually seen this in flight.
Thanks in anticipation of a flood of replies.
Joined: May 2010
Posts: 1,093
Likes: 9
From: UK
Np is propeller RPM.
Such gauges are only found on turboprops, on piston engines the prop RPM is either the same as the engine RPM or geared down by a fixed ratio so we are only interested in engine RPM.
IOW - you are asking in the wrong forum, turboprop jockeys are found in the Business Aviation areas.
http://www.pprune.org/biz-jets-ag-flying-ga-etc-36/
Such gauges are only found on turboprops, on piston engines the prop RPM is either the same as the engine RPM or geared down by a fixed ratio so we are only interested in engine RPM.
IOW - you are asking in the wrong forum, turboprop jockeys are found in the Business Aviation areas.
http://www.pprune.org/biz-jets-ag-flying-ga-etc-36/
