WORKED CLIMB GRADIENT CALCULATION: A departing aircraft must clear an obstacle rising 2,400 ft above aerodrome elevation at a distance of 6.0 NM from the departure runway end. What minimum climb gradient percentage MUST the aircraft achieve to reach 2,400 ft at 6.0 NM?

1. 3.3%
2. 4.8%
3. 6.6%
4. 8.5%