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Refer to figure or Flight Planning Manual MRJT 1 Figure 4.1. 
Find the OPTIMUM ALTITUDE for the twin jet aeroplane:

Given:

Cruise mass = 54 000 kg 
Long range cruise or 0.74 MACH

  • A

    34 600 ft

  • B

    35 300 ft

  • C
    maximum operating altitude
  • D

    33 800 ft

Refer to figure.

We need to find the OPTIMUM ALTITUDE => therefore, we must use the first table.
1. Enter the table at 54 000 kg (Cruise weight).
2. Draw a vertical line upwards to intersect the "0.74 MACH" Reference line.
3. Continue horizontally to the left to read the result of 34.6 (34 600 ft) - this corresponds to our Optimum Altitude.

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