The trick here is to note that in trimmed level flight the load factor is one but the stick force is zero. So the first 1g is free in terms of stick force.
Limiting load factor for a large transport aircraft in the clean condition is 2.5g.
So to go from 1g straight and level to 2.5g we require an increase of 1.5g.
Each 1g reuqires a 280N stick force, so an increase of 1.5 g from 1g to 2.5g requires a 420 N stick force.
The only other limit load factors that appear in the JAR ATPL exams sare:
2.0g for large transport aircraft with flaps down.
4.4g for a light utility category aircraft.
Last edited by Keith.Williams.; 4th September 2010 at 08:34.
Reason: Tooping errots