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A higher pressure altitude at ISA temperature...
  • A
    decreases the field length limited take-off mass.
  • B
    has no influence on the allowed take-off mass.
  • C
    decreases the take-off distance.
  • D
    increases the climb limited take-off mass.
Density is determined by pressure, temperature and humidity. Density affects:
  • The power or thrust of the engine. Reduced density will reduce the thrust and/or power that the engine can generate. Therefore, acceleration will be less, and the maximum TOM decreases.
  • Density affects the TAS for a given IAS. Reduced density will increase the true airspeed for a given indicated airspeed. Getting to a higher TAS, consequently ground speed can lead to a tyre speed limited take-off.
  • The angle of the initial climb. Since there is less thrust and/or power in low density, the angle of climb will reduce. Therefore, getting to the screen height will require a longer horizontal distance, which could not be enough to be clear of obstacles.

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