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What is the definition of the Service Ceiling?
  • A
    The altitude at which the helicopter can achieve a 150 ft/min rate of climb.
  • B
    The altitude at which the helicopter can achieve no rate of climb.
  • C
    The altitude at which the helicopter can achieve a low specific rate of climb.
  • D
    The altitude at which the helicopter can achieve a 200 ft/min rate of climb.

Refer to figure.
As altitude increases:

  • The power required line moves up and expands to the right and
  • The power available line moves down.

Where there is an excess of power available over power required, a helicopter will be able to climb, until the point at which the rate of climb (ROC) drops at a specific value depending on the helicopter type.

This specific value of ROC determines the altitude of the "service ceiling" and a limited range of speeds occurs.

For a Twin Engine Turbine Helicopter (TETH), according to CAP 758 Figures 3.15 and 3.16, the service ceiling for both All Engines Operating and One Engine Inoperative is the altitude where the margin between power available and power required permits a rate of climb not more than 150 ft/min flying with VY(top left corner of each graph).

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