Take Off Weight Limitations

FIELD LENGTH LIMITED WEIGHT

is the maximum weight of the A/c that can be used for existing atmospheric conditions, considering the failure of critical engine at V1 following which A/c is stopped within the Runway or to continue the Take off and achieve a height of 35 feet at the end of Runway or Clearway if available.

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CLIMB LIMITED WEIGHT

is the maximum weight of the A/c that can be used for existing atmospheric conditions, considering the failure of critical engine at V1 following which A/c maintains minimum Climb Gradient requirements  as follows

FIRST SEGMENT SECOND SEGMENT THIRD SEGMENT FOURTH SEGMENT
THRUST POSITION TAKE OFF THRUST TAKE OFF THRUST TAKE OFF THRUST MAXIMUM CONTINUOUS THRUST
SPEED V2 ABOVE V2 ABOVE V2 Vy
MINIMUM CLIMB GRADIENT POSITIVE 2.4 % GROSS 1.2 % GROSS AVAILABLE OR ACCELERATE 1.2 % GROSS
F A/C 35 FEET 35 TO 400 FEET MINIMUM 400 FEET MINIMUM 1500 FEET

OBSTACLE LIMITED WEIGHT

is the maximum weight of the A/c that can be used for existing atmospheric conditions, considering the failure of critical engine at V1 following which A/c continues the Take off and clear all the Obstacles by the Specified Safety Margin. Specified Safety margin is termed as a height of approximately 35 feet above any obstacles for a straight out departure.

For a Special Procedure Departure, (A departure which requires a maneuver to be made after Take off, like a turn etc.) this height is increased to 50 feet.

BRAKE ENERGY LIMITED WEIGHT

is the maximum weight of the A/c calculated for existing atmospheric conditions, considering the failure of critical engine at V1 following which A/c is stopped within the Runway length, ensuring the energy absorbed by the A/c brakes does not exceed the maximum allowable limit, which when exceeded can cause brakes to melt due to high amount of heat produced by the metal contacts.

STRUCTURAL LIMITED WEIGHT

is the maximum weight of the A/c that can be with held by the A/c under all the certified conditions of flight, including the Turbulence that may be experienced in flight.