part power
Usual disclaimers apply!
Joined: Nov 1999
Posts: 843
Likes: 0
From: EGGW
Part Power
A guarantee if you like that the engine will obtain a certain EPR (Pratt and Witney or Rolls Royce) or N1 target (GE engine) at a set (rigged) thrust lever position.
Used on engines with a cable to the JFC/FFR/MEC
A guarantee if you like that the engine will obtain a certain EPR (Pratt and Witney or Rolls Royce) or N1 target (GE engine) at a set (rigged) thrust lever position.
Used on engines with a cable to the JFC/FFR/MEC
Joined: Dec 2006
Posts: 236
Likes: 1
From: belgium
It's basically needed to match throttle angle with engine output power.
On some turbofans you have one or two rigging holes (mostly part power and flight idle) that have to match certain EPR criteria. I recall doing part power adjustments as this: insert a 94 degree part power stop in the rigging hole, start engine and advance thrust till you hit the stop, adjust a trimmer on the engine while its running to match a certain EPR e.g. 1 click with an allan key in the trimmer was 0.001 EPR or something. My memory fails. I did this on old RB211C's on 757 and JT8's on the 727.
On some turbofans you have one or two rigging holes (mostly part power and flight idle) that have to match certain EPR criteria. I recall doing part power adjustments as this: insert a 94 degree part power stop in the rigging hole, start engine and advance thrust till you hit the stop, adjust a trimmer on the engine while its running to match a certain EPR e.g. 1 click with an allan key in the trimmer was 0.001 EPR or something. My memory fails. I did this on old RB211C's on 757 and JT8's on the 727.
