Topping
P&A,
I was referring to how the maintenance test pilot or the SA production test pilot would check and adjust topping. In temperate/warm conditions, the Ng adjustment was set so that the Ng limiter would result in reaching and not exceeding the limit T5. The engine would then limit at an Ng that would result in the limit T5, which would, in those conditions, be less than the limit Ng number for 2.5 min power.
It had to be extremely cold for that engine to reach the Ng limiter ( i.e., the posted Ng 2.5 minute limit ) prior to reaching the T5 limit.
Some 61's had remote topping adjustments built in, accessible from the cabin ceiling area, but I cannot recall if the commercial models were so equipped. Sure made this task easier.
Last edited by JohnDixson; 9th February 2013 at 11:07.
Reason: Additional thought