Thrust reduction during departure
Hi,
We are working on a paper focusing departure and climb phase. According to data for typical narrow-bodied commercial aircraft we have, it seems that the engine thrust is reduced at about 1500 ft. For instance, the average N1 is about 88.6±2.6% between 35 and 1500 ft, whereas it is about 87.7±1.8% between 1500 and 3000 ft. There are noticeable decreases at other engine/aircraft parameters as well (i.e., FF, EGT, climb gradient etc).
If you agree with my explanation so far, I have two questions:
How does the presence of obstacles at the departure track affect the thrust reduction height? Could you give me an example please?
Do all aircraft execute thrust reduction at a specific height? Or it depends on performance of aircraft, weight, weather conditions or departure procedure?
Many thanks in advance.