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Refer to figure.
Calculate the aircraft height gain after 2.5 NM, given:

Mass: 4 200 lbs
PA: 4 000 ft
OAT: +30°C
Wind: 20 kt headwind
(All engines operating)

  • A
    3 300 ft
  • B
    694 ft
  • C
    2 550 ft
  • D
    1 350 ft

Refer to figure.

FIND THE RATE OF CLIMB (GRAPH):
(1) Enter the graph at the left bottom scale at a temperature of 30ºC. Continue vertically up until you intersect a pressure altitude of 4 000 ft.
(2) From this point, continue horizontally to the right to the first section of the graph - which corresponds to the "2 Engines" Rate of Climb - track to the 4200 lb line.
(3) Proceed downwards and read a value of approximately 1750 ft/min.

CONVERT IAS TO TAS (FLIGHT COMPUTER):
(1) On the "True Airspeed" window, align the pressure altitude (4000 ft) with the temperature (+30ºC)
(2) On the inner scale look for 92 kt IAS and read the corresponding value of approx. 101 kt TAS (outer scale).

CALCULATE THE GROUND SPEED:
Ground Speed = TAS - Headwind
Ground Speed = 101 kt - 20 kt = 81 kt

CALCULATE TIME TO COVER 2.5 NM (GS 81 KT):
Time = distance / speed
Time = 2.5 NM / (81 kt / 60 min)
Time = 1.85 min

CALCULATE HEIGHT GAIN (Using rate of climb obtained on the first step):
Height gain = Time (min) x Rate of Climb (ft/min)
Height gain = 1.85 min x 1750 ft/min = 3238 ft

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