Given the following information, calculate the gradient and Rate of Climb required to clear an obstacle by the statutory minima, which is located 682 metres from the end of TODAH and 425 feet high.
Pressure Altitude: 5 000 ftOAT: +10°C
Climb speed: 50 KIAS
1. The statutory obstacle clearance is 35 ft.
2. The required change in height is 425 ft, because the helicopter will already be at 35 ft at the end of TODAH. This will give the necessary clearance.
3. Using your Flight/Nav computer, determine the TAS at 5 000 ft with OAT +10°C: 54 kts.
4. The climb gradient is: Climb Gradient = (Change in Height x 100) / Distance travelled = (425 ft x 100) / (682 m x 3.28 ft) = 19%.
5. Climb Gradient = (RoC / TAS). Solving for RoC, we get: RoC = Climb Gradient x TAS = 19% x 54 kts = 1 026 ft/min.
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